February 05, 2012

G3XBM (Roger)

481THz optical treebounce and skyscatter


Optical treebounce (0.3km total path) 10wpm CW 0.501kHz 35dB S/N
This evening I did some further tests with optical treebounce and what I'd loosely call skyscatter. The sky was cloudless, but a little hazy. My test kit was as follows:  TX (250mA high brightness red LED, 100mm optics in one room of house), RX in another room KA7OEI based head (doors closed, no light leakage) with 100mm optics.  PC running Spectran positioned to minimise light pollution to RX head.

First test was 10wpm CW off the tree (0.3km path length total) with strong signals received 35dB S/N in 5.4Hz bandwidth. Signal v.clear in the earpiece too. I could just make out the red light glow in the distant tree branches. Aiming critical.

Weak QRSS60 signal received by aiming at clear sky
Second test: TX and RX elevated to aim at roughly same patch of clear sky. QRSS60 signal sent from TX. Signals detectable in Spectran in 0.17Hz bandwidth, weakly, but definitely there. It is less clear on the capture than on the real screen. For this second test I made no great attempt to optimise the RX aim,
just aimed at what I thought was roughly the same patch of sky. Now I can't be sure whether the signal is purely from scattering off mist/dust particles or what, but I think it is unlikely signals are coming off other objects as I am aiming quite high into the sky (about 45 degrees up) clearing nearby stuff.

These tests suggest that with very slow QRSS I may be able to get a non line-of-sight optical signal to G6ALB in the next village 3km away. When the weather improves I'll go out /P with the PC and RX and see if I can detect the "forward" scattered optical baseband signal at much greater range (1-3km). With proper cloudbounce it should be better I think.

This reference looks like it should be interesting (about scattering) http://en.wikipedia.org/wiki/Rayleigh_scattering

Posted at: February 05, 2012 10:58 PM

VE3WDM (Mike)

Almost got some radio time in today.......

Center conductor to braid reading
In my last post I commented on not finding the time to get on the radio, so Saturday night I penciled in some radio time for Sunday. All was going well and I was able get the chores done I had planned to and now it was radio time. I sat down at the K3 on went the computer and then the K3 and my CQ began.....then Murphy paid me a visit. I noticed my SWR was bouncing all over the place from 1.2 up to 4.1 and so on!!!! I switched over to

Removing old coax from PL 259

Connector all cleaned up
the dummy load and all was well with the SWR which slowed my heart down from the steady pounding thinking it was  my rig that was acting up. Now it was time to narrow things down on the other side of the rig. I directly hooked my Alpha Delta DX-EE antenna to the K3 and the SWR was good. That meant I was not going to have to travel into the attic anytime soon. It had to do with the interconnections here in the shack. I did narrow it down to a coax patch cord that had a high resistance from braid to center conductor. It was a simple matter of removing the PL 259 and reinstalling it a little further down the coax. The method I use when removing  the coax allows me to heat up the center conductor and pull it out. I then pock the round Weller soldering tip through each hole where the braid is and at the same time pull the braid. I find this removes the old coax fast and clean.

The PL 259 ready to go

Posted at: February 05, 2012 09:59 PM

K2DSL (David)

QSO Parties Galore

There were a few QSO parties this weekend and I made some contacts in them, all on SSB phone. Looks like combined I eeked out 45 contacts in all.

In the Delaware QSO Party I made 5 contacts – 2 on 40m and 3 on 80m.

In the Minnesota QSO Party I made the most contacts of any of the contests with 27 total Qs with 23 of them on 20m.

In the British Columbia QSO Party I thought I’d hear more activity and only ended up with 1o contacts, most also on 20m.

In the Vermont QSO Party I made just 3 contacts, 2 with 1 station.

Now time to watch some football – Go Giants!

K2DSL

Posted at: February 05, 2012 09:35 PM

G3XBM (Roger)

Remarkable "all diode" transceiver QSO


DL3PB's "all diode" transceiver
Today I got this most interesting email from Peter DL3PB. Peter must be congratulated on this excellent achievement.
Hi folks,
I'd like to share with you a long-cherished dream, that recently came true, fourty years after I came to read about hams using tunneldiodes to make QSOs when I was aged twelve or so:
Finally I managed a first skywave QSO with my PARASAKI-transceiver, an 'all diode' rig:  Christophe/F8DZY replied to my very first call on 20m band in REF-contest last weekend. I was running 2mW into a temporary vertical dipole on my balcony. Distance between us is  918km - obviously OM Christophe has excellent ears.
Those interested in the cruel details of my circuit, please find attached a schematic and a photo of the pretty ugly setup. The circuit is designed straight-forward with exception of the parametric VXO, derived from Mike/AA1TJ's famous Paraceiver design. (see  http://fhs-consulting.com/aa1tj/paraceiver.html)

The low impedance of the high peak-current tunneldiodes make it very difficult to built a really crystal controlled oscillatorrather than an LC-oscillator, synchronized by the crystal more or less, at least on the higher SW-bands. The Parametric VXO provides a crystal-stable, chirp-free signal on expense of an output power of two milliwatts only instead of ten, but with an amazing spectral purity, no need for a low pass filter or such. Of course it sounds pretty cool making a QSO with a 'bunch of diodes' and a parametrically excited crystal, but believe me or not, I'd preferred to bring that full ten milliwatt into the air - on the other hand that approach allowed  to tune the rig a bit ( ~ 5kHz/per xtal ), which turned out to be much more valuable than a few milliwatts more while being 'rock-bound'.
The receiver in its 'gain-less' version works fine for strong signals - while listening to QRP(p) stations, the moderate gain of the audio amplifier helps a lot. A comfortable frequency shift between receive and transmit is realized by the 5µH inductor at the LO-port of the mixer, with little effect on sensitivity.

Thanks for the bandwidth, OMs, won't bother again you with such mails, unless I make a cross-pond QSO with that rig ( not that likely ) or any skywave QSO with homemade semiconductors ( probably impossible )...
72!
Peter/DL3PB"


Posted at: February 05, 2012 09:35 PM

2E0HTS (Simon)

Day 5 February QSO Challenge

The QSO challenge for Day 5 was made on the 80M band at 20.11 utc where I worked DO1HEP - Hermann operating SSTV on 3.730 MHz. I was sending some slow scan CQ Calls when Hermann - DO1HEP received my signal and came back with some of his own slow scan TV images as seen below.


DO1HEP - Hermann was using Yaesu FT-897, 100W into a long wire antenna.I was using 25W from my FT-1000 with a RIGBlaster plus interface and Mmsstv software into my Windom antenna.I don't operate SSTV as much as I would like to and enjoyed making this QSO. Our stations are at a total distance of 515.6 miles apart, I am pleased with my completed challenge of the day. 73

Posted at: February 05, 2012 09:00 PM

W2LJ (Larry)

Brave and Hearty Souls

Now this is REALLY Freeze Your Buns Off / Polar Bear Moonlight Madness !!!

QRP'ers - are we dedicated or just plain crazy?



Gatineau Park and the Wolf Trail sure look beautiful!  Thanks Martin, for sharing, you have shown us the quintessential FYBO / PBMME effort.

FYI, the HK0NA DXpedition ended today.  Thanks to the crew and its supporters for their efforts.  I got them exactly once and that's plenty for me.  According to the Team, even after 190,000 +++ QSOs, the pileups were still very deep.  Hope all of you were lucky enough to have worked them, if you were trying.

72 de Larry W2LJ
QRP - When you care to send the very least!

Posted at: February 05, 2012 07:40 PM

First KX3 Field Test

This appeared on the KX3 YahooGroup reflector today:

All-

Attached is a photo of KX3 #6. It's an outdoor shot with the backlight off. This unit is in Field Test here, which is its own type of milestone for all those waiting patiently. I'll be writing objective appraisals of this FT unit. That will be my intent, anyway (objectivity). This email is a first cut. Read on.

My personal opinion is that this is the coolest amateur transceiver ever designed, built, or dreamed of. Perfect size, perfect weight, VERY respectable performance. You can *really* take the KX3 with you, and you’ll really want to. Mine’s going everywhere with me, including the workplace! I know my engineering staff will demand to see how Wayne and crew fit it all in, and how well the KX3 works.


After one day using this unit, I've reached the conclusion that the KX3 is basically ready for initial production. As is usual for a 'young' rig from Elecraft, firmware is still a work in progress. This should be no surprise to anyone on this list. The hardware is at near-100% shape, IMHO. There are a few minor issues - mostly features not yet implemented. And I mean minor. If I weren't an engineering manager in the consumer products industry I would not have noticed any of them. The electronics seems solid, and I've done a bit of lab testing for MDS and selectivity. Most of my testing has been on the air though. My lab testing shows MDS better than -136 dBm, but my signal generator can't extend any lower. No problems with rejecting out of band signals (away from the roofing filter's coverage).


On the air: I've had about fifteen CW QSOs, using between 1 and 12 Watts output power. The antenna is a homebrew multi-band vertical, ground mounted. Four of these Qs were on battery power. No differences were found between operating on external and internal power, except for the output power limitations due to batteries. One Q was with an extremely weak QRP station in New Mexico. The APF helped with this, to the point that I could not have pulled him out without the feature. With APF engaged, his signal was 539 with rapid fades to 319. He was running 0.5W and I was running 3 W. Great ragchew, with very few repeats.

Except for Navy-Marine Corps MARS, I'm mostly a CW op. Several SSB contacts went successfully after a false start: I had to finagle the MH3's input connection a bit (a virgin socket seating issue). I set the MIC and CMP values by listening on a second receiver and built in MONitor, giving MIC=18 and CMP=10 as the best combination. Audio reports using the MH3 and this setting were excellent - "clear as a bell" and "good presence”. Output using the internal speaker is adequate, though not amazingly loud. Some of that is probably my 55 year old ears and too many rock concerts when I was younger. The frequency response seems relatively flat and lows are surprisingly well-represented. Distortion is low (< 2% THD the way I hear it).

The FOC and NA contests run this weekend were an interesting environment for first-time ops on the KX3. Lots of strong signals, many in excess of S9+25. A majority of the QSOs mentioned above were near strong signals and with the roofing filter in place I had pretty good luck ignoring the big guns while working weak signals. I have to admit this is completely subjective, however years of experience with the K3 also tells me that the KX3 has similar characteristics in this regard. The best example from on-air testing was the NM CW station I mentioned above. His signal was marginal, meaning the APF was essential for pulling him out of the band noise. At the same time, 3 to 4 KHz up was one of those big guns thumping away. I could even hear key clicks from the contester, but only a tiny amount of blocking from his signal on the KX3. That's what I mean by "similar to the K3". It's not identical though. I found instances where a little bit of a strong station's signal was near- or in-band, and as you would expect some pretty severe blocking occurred. I'd recommend everyone make sure they have the roofing filter on the "essentials" list for purchase. In many ways the roofer makes the KX3 what it was meant to be.

One thing that’s notable and exceptional: I haven’t seen any of the typical issues of a “zero IF” architecture. No image problems, no ripple in the passband (in either SSB or CW), no audio artifacts. The advantage to a zero IF architecture is that there’s no “donut hole” around the IF frequency; there are others too – one single conversion takes less space than multiple conversions, less power consumed, less heat generated.

As a Navy-Marine Corps MARS operator, I’m looking forward to using the KX3 in our ECOM exercises. Its size and power consumption are perfect for such types of portable operation. It’s the item that will take the least amount of space in your Go Kit.


Sorry so much of this is non-quantitative. I'll try to get more out after another day or two.


Standard disclaimer: I am not employed by nor do I have a fiduciary interest in Elecraft.


73,

Matt Zilmer, W6NIA / NNN0UET / NNN0GAF THREE
NMCM RMS Winmor: NNU9ET-5: Upland, CA.


W2LJ is .....trying.......to........remain calm ..........not get.........too...........excited ..........

Not working - not working - not working !!!!

72 de Larry W2LJ
QRP - When you care to send the very least!

Posted at: February 05, 2012 07:25 PM

G3XBM (Roger)

A 472-479kHz band?


Latest reports from the WRC2012 conference suggest the possibility of a secondary amateur allocation between 472-479kHz look "promising" although this hinges on a crucial meeting on Tuesday Feb 7th. Some countries remain against an amateur allocation, but the majority do support one, with caveats. A 7kHz wide worldwide allocation would be a good outcome, so keep fingers crossed for a few more days.

Posted at: February 05, 2012 06:45 PM

KA3DRR (Scot)

My 10,000 Hour RadioSport Challenge | 9,590 - 37 = 9,553 Hours To Go

Where is the time? I share in VE3WDM's latest posting where he speaks to working full time and maintaining a household during the week. Essentially, weekends are for ham radio and all the fun that follows, our hobby is relaxing only when Murphy doesn't involve himself in a project. 

Also, I listen a lot during the weekend, logging stations needed for one award or another. It's my operating style while plowing most of my free time budget into RadioSport.

Please note the following RadioSport events were subtracted from my long term 10,000 hour goal--
  • 2011 Sweepstakes CW Multi-Single 9th Place Finish @W6TK's = 6 Hours
  • 2011 CQ WW CW @W6SL Single Operator, Single Band (10m) = 18 Hours
  • 2012 North American QSO Party @W6SL = 10 Hours
  • 2012 North American Sprint CW @W6SL = 3 Hours
There are as many niches in our hobby as there are modes of operation. Certainly, time is of the essence, and for some like VE3WDM and myself, ham radio is a weekend activity away from the bustle of the work week.

73s from the shackadelic on the beach.

P.S. Pulling for the New York Giants this afternoon.

Posted at: February 05, 2012 06:33 PM

Cycle 24 Screenshot Project | 5 Feb 2012

Observed better Cycle 24 numbers however, keep in mind, we endured a long stretch without any sunspots even as the current trend dips into double digits.

Screenshot 1 is 10m. Screenshot 2 is 15m. Screenshot 3 is 20m.

SFI: 107 A-index: 6 K-index: 1 as recorded from WM7D.

Sunspot Count: 43

Turn on, tune up, operate!

Posted at: February 05, 2012 05:46 PM

G4ILO (Julian)

Some assembly required

Yesterday a packet from the USA dropped on to the doormat. It was the LCD UI module from Gadget Gangster. The cheap international shipping option is pretty quick!

LCD UI module ready for assembly

On opening the envelope I was taken by surprise as I hadn't realized the module was a kit. But there aren't too many components and they are all through-hole so I should be able to manage it. I will take my time and double check everything to ensure I don't do anything stupid like solder headers on the wrong side of the board. More than a few K2 builders have done that!

The instructions on the Gadget Gangster website are very comprehensive with several colour photos showing different stages of assembly. But on checking the parts against the parts list I found that I was missing one 2x8-pin header socket. Fortunately I found one (a pack of 2 actually) for a couple of quid from a UK based eBay component supplier so I should have it in a couple of days. eBay is my main source of electronic components these days as the usual sources like Farnell or Maplin all have hefty minimum order and postage charges that make ordering the single part you need to complete a project quite uneconomic.

Kits and Parts Universal RF Amplifier
 A few days earlier I received another kit from the USA: a QRP RF amplifier from Kits and Parts. I got this with the idea of using it with my Propeller beacon but it is probably too good for that. The beacon really needs only a simple class C amplifier to raise its output to a couple of hundred milliwatts. I had been tempted to go for a couple of watts but whilst WSPRing on 20m today and monitoring the signal on the K2 I noticed a weak in-band spurious around 14.05 MHz which no low-pass filter will eliminate. So it is probably best to stick to QRPp if using the Propeller as an RF source.

Another new arrival in the G4ILO shack was a GPS module from Hong Kong. This was used, ex-equipment, and cost about £12 including postage. I'm not sure what I am going to use it for but if I don't put it in the beacon to provide a time reference (and locator) for WSPR it would be interesting to try to make an APRS tracker using the Propeller chip.

So many projects! But I am convinced that having this amateur radio hobby to give me so many different and interesting activities is the reason I remain cheerful and positive unlike so many people who have the same health condition and seem to fall into a slough of despond and hopelessness. I may never complete them but at least they give me something to stop me dwelling on darker thoughts.

Posted at: February 05, 2012 04:54 PM

W8MRC (Milford Amateur Radio Club)

MARC is Offering Technician Classes

Provided by Mike Ernst, AE8U
President, Milford Amateur Radio Club

I am pleased to announce that MARC will be holding Technician Classes. They will begin on February 15 and will run for four consecutive Wednesday nights, continuing on February 22, 29 and March 7. They will run from 6:30 PM to 8:30 PM. They will be held at the same place we hold our monthly meetings, the Faith Church located in Milford on Price Road.

If you know of anyone that you have been prodding to get a license, or someone who has expressed an interest, please have them call or email me right away so we reserve a slot for them. I plan to run an ad in the local newspaper and perhaps on the Enquirer website. I expect this will get some attention and we will get filled up quickly. We already have 6 students form the Red Cross as well as one other person. Please contact me at ae8u@fuse.net.


View Larger Map

Posted at: February 05, 2012 04:48 PM

AE5X (John)

Elecraft KX1 vs. Ten Tec HB1B

With Ten Tec now selling a YouKits version of Elecraft’s KX1 I thought I’d take a look at how the two compare in basic features.

Numbers don’t tell all but they’re a good place to start:

Some other differences:

  • The KX1 offers a built-in autotuner for an additional $120. This greatly adds to the convenience of a rig designed for portable use given the wide variety of antennas that may be implemented by owners.
  • The HB1B is already assembled. This is a major advantage to those who have no interest in building their own equipment.
  • The HB1B also has a 4-pole filter. This may not seem like a big advantage over the KX1′s 3-pole but the KX1 does suffer from adjacent sideband interference of strong signals.
  • Elecraft’s support is well-known and universally respected. Their online forum is also extremely helpful for those needing it. Tough to put a $ value on that asset…until you need it! How will Ten Tec’s support be for the HB1B? Not being a kit, similar levels of support probably won’t be required.

I have a 3-band KX1 and have taken it on many business and backpacking trips (most recently here). It’s a fine, reliable rig and, with its built-in tuner, offers a complete station in a single box – but at a price. A 4-band KX1 with tuner is a whopping $510. Add Elecraft’s paddles for the KX1 and you’re up to $580.

The KX1′s everything-in-one-box is a wonderful thing but it comes at the cost of flexibility, ie the KX1′s internal autotuner can only be used with the KX1. If I had it to do over again, I’d be very tempted to opt for the HB1B, an Elecraft T1 autotuner (that could be used with any QRP rig) and a set of paddles from Whiterook.

 .

.

Posted at: February 05, 2012 03:40 PM

VE3WDM (Mike)

Is it just me............



I am very excited about ham and have a great time in radio contests,  calling CQ on QRP frequencies, outdoor op's , sitting down at the work bench and building projects and last but not least reading radio blogs.  Is it just me or am I the only one that has a hard time finding the time during the week to do the above radio adventures!!! I'm up at 4am during the weekdays to head out to work and home around 5:30. Then there is the lunches for the next day to be made, the dinner to get going and some house cleaning heck I'm in bed around 9pm so not much time left to do anything else!! There have been times when I do sit in front of the
radio but to be honest I am just to tired to put forth the effort for a CW QSO. It is fantastic as I read Larry W2LJ blog who has made a commitment for 2012 to make at least one contact per day. Then as I read Anthony EI2KC blog and he is bagging DXCC countries daily. I have this past week given some thought on to how to get my beloved radio time in. There are the weekends and at times they can be busy but to prearrange some time and not just hope it will happen may help. During the week I do have about 45 minutes before I have to start work. I was toying with the idea of setting up the K2 in the car along with the mono band mobile antennas  and spending that time to get some QSO's in. But boy oh boy I just don't know how hams do it to be very honest..........

Posted at: February 05, 2012 02:10 PM

W8MRC (Milford Amateur Radio Club)

Annual WARN Weather Spotter Training


Updated by Mike Nie, W8VMX at WARN

The annual severe weather spotter training sponsored by the Weather Amateur Radio Network has been scheduled for Friday, March 30 at 7:00pm. After many years at the old location, we are excited about a change of venue. This year the training will be in the Golder Conference Rooms at Bethesda North Hospital at 10500 Montgomery Road. Up-to-the-minute information on the class can be located at WARN website. As always, amateur radio operators are encouraged to attend this spotter training session, but it is open to the public, so you do NOT have to be an amateur radio operator to attend. The same training content is included as all spotter classes taught by the National Weather Service office in Wilmington.

With the change in venue, we’ll have to keep an eye on how many people will attend. So, we’re doing online registrations for the class to track how many people will be there. Please register each person that will attend. We’re only asking for 3 pieces of information – Name, phone number, and email address. The sooner you register, the better.

We’ll be updating the training page referenced above with more information on the new venue in the coming weeks.

We think everyone will like our class location. We’ll send updates as necessary.

Provided by Steve Lewis, N8TFD

Please see the WARN website for the announcement.

Note the *change of venue* and the request to register so WARN can comply with the person-limit of the room(s).

This announcement is going to ham radio operators before other members of the public.

-73- de N8TFD/Steve

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Posted at: February 05, 2012 01:55 PM

Butler County ARA (BCARA) Special Event Station

THE BUTLER COUNTY AMATEUR RADIO ASSOCIATION (BCARA), will be conducting an amateur radio “special event” February 18-26, 2012 to commemorate a historic Washington’s Birthday amateur radio message relay which was conducted on February 22, 1916 by members of the American Radio Relay League (ARRL); formed in 1914; and members of the Radio League of America (1915-1921).

The special event will be conducted from BCARA’s club station W8WRK located in the original station building of Special Land Station “8ZU” (1915-1919) which was one of the twenty-seven primary receiving and sending stations used for the February 22, 1916 radio message relay!

For more information on this special event station operation, please go to www.bcara.net

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Posted at: February 05, 2012 01:53 PM

KC9NCF (Dan)

Media Network Plus - Official Blog Updated


All of the January 2012 Media Network Plus shows can be found at the updated blog (except for the first January 2012 show, which has a separate post). This updated post talks about what we have been up to this past month at Media Network Plus, AND the fans get a special treat! What is that treat? Well, we posted the well known song, "Olive Tree" heard on the January 14th show at the end of the show.


Posted at: February 05, 2012 05:00 AM

(Robert)

Hello world!

Welcome to WordPress. This is your first post. Edit or delete it, then start blogging!

Posted at: February 05, 2012 04:28 AM

February 04, 2012

W2LJ (Larry)

FYBO fun

FYBO was fun today.  No big effort as there were way too many other things going on that vied for my attention.  In between chores and duties, I was able to get out to the driveway, where I had the PFR3A on a battery in the back of my Jeep.  The antenna was the Buddistick on the magmount on the top of the roof.  Kudos to Bob W3BBO for suggesting this setup - it worked great!  The car body acts as a much better counterpoise/ground plane than the single wire and using the magmount eliminates the need for mast and guying.  So if you're not hiking - this is a great way to use a Buddistick.


It ends up being much taller than a standard Hamstick (definitely not drivable), but the SWR was very nice and I was able to use the PFR3As internal tuner to even get that ironed out flat.

Ham at work - excuse the mess!

First QSO of the day was with Hank N8XX operating as "Amigo" with the WQ8RP callsign.  In all, I made 11 contacts in between grocery shopping, baking some bread for my daughter's choir bake sale, etc, etc, etc.

Here's a better look at the antenna.


On 40 Meters, I undid the tap and extended the whip all the way.  That gave me about a 1.4:1 SWR.  I only made one contact on 40 Meters and that was with Mark NK8Q in Pennsylvania.  He was using only 1 Watt and almost blew the ear buds out of my ears.  I don't think I have ever heard 1 Watt as a 599 Plus before today.

The temperature was 45F when I started, so for simplicity sake, I used that throughout, even though I think it started dropping for my last couple of QSOs.  I think the lowest temperature that was reported to me was 32F and the highest was 76F.

72 de Larry W2LJ
QRP - When you care to send the very least!

Posted at: February 04, 2012 10:37 PM

M0TUX (Ben)

SQL COALESCE function

Today I discovered the SQL function ‘COALESCE’.  The function returns the value with the highest precedence datatype from a comma separated list of expressions.  For example:

SELECT COALESCE (site_settings.VALUE, settings.VALUE) AS VALUE
FROM site_settings
LEFT JOIN settings ON settings.id = site_settings.setting_id

In the above example the first non NULL value passed to the COALESCE function is selected. if site_settings.value is NULL then settings.value will be selected. If settings.value is NULL, then the site_settings.value will be selected. If both values are NULL, then NULL will be returned.

Here is the MySQL reference page for the function: COALESCE

Worth keeping in mind. Came in handy for simplifying some SQL at work.

Posted at: February 04, 2012 09:27 PM

AE5X (John)

HF converter kit for FunCube Dongle arrives

Click for larger

Today’s mail brought an envelope from Portugal, courtesy of CT1FFU and CT2IRW, containing a bag of tiny parts…but not too many of them!

I’m not the most enthusiastic builder of kits containing SMD devices but with only a small handful of parts I’m not expecting much ado. With only one cap to tweak and no coils to wind, construction ought to be a snap and will add HF reception to the FCD’s already broad spectrum of coverage.

This second round of kits seems to have sold out quickly but their website promises to make the kit available for at least another round.

 

.

.

Posted at: February 04, 2012 08:22 PM

“Going mobile” with an FT857D

Taking advice from an old rock & roll song, I’ve decided to pull my recently updated FT-857D from storage and install it into my car.

An upcoming business trip coincides with the DXpedition to Spratley Island 9M0L and one or two other DXpeditions. The only hope I have in being able to work them is mobile – though not with a mobile antenna. The idea is to have a 100-watt signal and a wire vertical (I won’t be the guy with a Hamstick on his Corolla).

The corporate apartment where I’ll be staying may or may not have a cooperative tree outside the window for antenna hanging but having the rig in the car will allow me to drive to a park or some other location where an antenna will be possible.

I wouldn’t normally go to such trouble but Spratley would be an all-time New One for me.

But Spratley - through a pile-up…from a car? Surely you jest.

Others have made similar contacts – and don’t call me Shirley!

To inspire me are those other DXers who’ve accomplished amazing things while mobile, including KH6DX who has the world’s only 160-meter DXCC from his car.

The installation was dirt simple aside from running the power cable from the battery to the car’s interior – I left that to the pros who did a much better job than I could have done for a mere $50. The rig itself is under the seat and the front panel is on the center console where it takes up far less room than the 2m rig that had been there. Expansion kits are fantastic for today’s small cars with such limited real estate on the dashboard.

The only thing left to do is order a CW filter.

Out in the woods or in the city
It’s all the same to me.
When I’m mobile…..Keep me moovin’

The Who

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.

Posted at: February 04, 2012 07:52 PM

G3XBM (Roger)

QRP and S Points


This very useful little diagram was posted on Wim PC4T's blog today showing how little effect going QRP usually has on operating effectiveness. Going from 100W to 500mW is just 4 S-points, so if your signal is strong you'd still be a decent signal. Of course, when conditions are marginal 100W may be helpful, but QRP is so much more fun.

Posted at: February 04, 2012 06:01 PM

Optical receiver noise floor measurements


A PC with some simple free software makes a very useful piece of test gear.

For example, today I wanted to check the noise floor of my optical receiver head between 0-20kHz in total darkness and in daylight and compare this with the noisefloor of the PC with the head turned off. SM6LKM's excellent little software receiver designed to listen to SAQ's transmissions on 17.2kHz was ideal. This tunes from 0-22kHz. Here are the results (see plots) which show noise goes up by about 5dB in the daylight, although noise at 0-2kHz seems to go down in sunlight. By connecting the optical receiver head to the PC I was able to use this little package to see the noise floor changes.  G4JNT thinks the FET is possibly being biassed to a less optimum position, or it is saturating, in daylight. By changing the bias I may be able to get a lower noisefloor and better sensitivity. That I shall try tomorrow.

Posted at: February 04, 2012 05:31 PM

4X6IZ (Sivan)

A Lego Enclosure for an APRS Tracker with a Built-In Antenna

My APRS tracker seems to work quite well, but it was difficult to use with various pieces of equipment sloshing about on the dashboard. Initially, I’ve been using the short vertical antenna that came with the UV-3R radio. Both the radio/antenna and the GPS antenna were placed on the dashboard. This antenna did not work [...]

Posted at: February 04, 2012 04:13 PM

G3XBM (Roger)

481THz update: 1.6km test


Today I did my first test beyond the end of my street and in daylight.  I set up my 1.082kHz subcarrier CW beacon and 100mm optics pointing out through my double glazed bedroom window and aimed it at a local feature called the Devil's Dyke which is 1.6km (1mile) exactly from home. This is the furtherest line-of-sight (LOS) path I have from home.

Then I went up to the Devil's Dyke and started looking with my handheld 100mm optics receiver. Much to my joy and surprise I heard the beacon before I spotted it by eye. The beacon could be copied over a stretch about 50m along the path. S/N I'd guess at around 20dB (by ear) in speech bandwidth in daylight. Next time I'll take the laptop and measure S/N with Spectran.  1.6km is my best distance so far. I'm using a BPW34 detector with some reverse bias with the PIN diode's anode connected directly to the FET gate in a KA7OEI optical head. This feeds into a feedback biased common emitter stage into a crystal earpiece. Recovered audio was a bit low in the wind.

Some progress in the right direction.

Posted at: February 04, 2012 03:31 PM

K0NR (Bob)

2012 ARRL Field Day Information Packet Available

ARRL Field Day is the single most popular on-the-air event held annually in the US and Canada.  Each year over 35,000 amateurs gather with their clubs, friends or simply by themselves to operate.

The information packet for Field Day is now available on the ARRL web site.

- Bob K0NR

Posted at: February 04, 2012 03:28 PM

M0TUX (Ben)

Motivation

I’ve decided to spend this snowy day setting up a new WordPress install for my blog.  I’ve had an idea for a project I would like to work on so rather than diving into that, I’m doing this!  I could be accused of procrastinating…

The real reason I’m re-setting up WordPress is to help me focus.  By writing down and thinking about the ideas and the resulting code I can make it the best it can be.  If it helps someone else along the way, great!  I’m likely to focus on PHP and Python as day to day thats what I’m work with.  I’m likely to plan out my project on paper over the next couple of weeks.  When I am focusing on something such as an API or a Python library I’ll use this blog to explain what I’m up to and why I’m approaching a problem from that angle.

I’ve not done much web work with Python before, so when I get to it thats where I’ll start.

 

 

 

Posted at: February 04, 2012 02:49 PM

M0SCG (Sands Contest Group)

Musings From Paul 2E0EET

Gained M6PEW on August 8th 2010, so what of 2011; my improvement, involvement and tribulations During my first full year, I have many people to thank for advice, instruction and help on the way to horning my skills of Amateur Radio. It has occurred to me that I have not updated people’s involvement where perhaps I should have. That is really what this is about, to bring things up to date, and to show what I have been up to in my spare time.

I guess my year commenced on January 1st, -27° on Heron Pike whilst doing a SOTA. I have always had a stock phrase for describing cold conditions “Gale Force Frost” Believe me, when the mist froze on my coat to a solid sheet of ice, I knew it was no longer a myth! This event also opened my eyes to a class system or snobbery experienced by many new comers these days. On returning home, and on many occasions since, I have checked a certain G8’s log (which you can do on SOTA sometimes) I now have had to come to the conclusion that said person does not enter mere M6’s into his Log. Pathetic, yes; as one of the organisers it is worse. No big deal you might think, but there is an award for an M6 making 100 QSO’s in his first year. It took me 720 QSO’s to log 100 QSL’s – which Damien kindly signed off on January 3rd. However this signalled my 1st 2011 improvement. Just as well, because on 5th January my 2nd improvement arrived – my 2E0EET. I must admit it took me a while to use it though because it smacked of snobbery considering the above.
On this hill, I was sharing G4UXH’s radio. After an initial fault on my FT817ND when a cable came off the BHI noise board – which Kev kindly repaired – things deteriorated. Nothing to do with Kev’s repair, as he had told me he wasn’t keen on one of the wires. It eventually transpired that the BHI gubbins became unstable with the excessive temperature changes. It couldn’t handle the extreme cold and the car heater back to back. Fine if you don’t do this kind of thing, but to suffer reception failure when you most need it is just not worth the problem. Castle Electronics removed the board as instructed, replaced the proper cap and retuned the whole set. I now think I have one of the best 817’s out there. This was to be my first encounter with bad luck for the year. I look forward to seeing how the new “Super Rig” puts up with such conditions – which I think I have said before. I guess you all know the next big setback – Lynda’s diagnosis and the op on her 1st February birthday. Since then, it’s been a long haul.

The same month I was accepted into Sands, and duly paid my first lot of subs in the year whilst Hughie attended to the weathers at the top of Barrie’s field. I also gained knowledge at this event which previously would have fitted a sketch on “The last of the Summer Wine” “Where’s North?” Asks Compo. Foggy replies “Where it was last year, over there behind Ingleborough where the sun is rising” I always enjoyed that programme, I never ever thought I would have the chances to experience it!

HF didn’t really start for me until well into the year, but I made the plunge into contests from home and have enjoyed doing them ever since, even on brief occasions.
N1MM is a great programme, which the group taught me to use. I’ve managed to destroy a log and make many mistakes, but I have improved immensely and now take time to ensure my Cabrillo’s are correctly fashioned. Having commenced with HF, I wanted to dabble into Digital (I think that means finger) radio and started to kit up with a Digimaster Pro + Interface + CAT Cable. More problems rained again. No way could I make my FT-897 talk to the computer, despite help from a Ham in London via Skype. He was stumped, I was frustrated and I got no help from the Digimaster seller. After new CAT cables that didn’t help - Castle Electronics again, who found a minute resistor had been blown somehow by, maybe, RF. They checked my CAT cable too, and found it was faulty. Whether I blew the resistor or it was already blown when I got the rig, I will never know. Whilst this was away, we did the Heron Corn Mill. I had admired Damien’s 920 the previous week and a talk to Linda YLM told me it was one of the few rigs she considered ok – not up to Elecraft standard, but not too bad. A couple of days later, I saw one advertised so took the plunge, I have not regretted it so thank you Linda.
The 897 is now just used for VHF. I have yet to play with my finger again. I wasn’t happy with my 20m long wire, and when Ian was at my QTH with the antenna mast/ trailer, he suggested I needed a doublet to suit the terrain. I was grateful for the advice, and decided to heed it. It wasn’t long before I had a 40m doublet up and running, after following building instructions found on the Internet

I didn’t look back, until something got worse – why I don’t know, but it did.
At first I blamed the Germans. Everyone else could hear me ok, why can’t they?
Soon though in one contest day, I was made aware that I had very bad RF problems, making my speech almost unrecognisable; plus, I had feedback in my Heil headset. This is when I asked the group for advice and also checked the internet. I guess this is when I had so much help from lots of people; I never did speak of the results until now. Here are some of the things I did, and thanks to everyone for helping me – it really was a stressful time; my 3rd rig in 6 months was beginning to look faulty.
First, I separated the Doublet from the Windom – I hadn’t noticed the fundamental mistake of having these just apart if not touching. Stupid I know, but it happened. Thanks Chris!
Secondly, I completed the RF Ground which Kev had told me about many months previous. Heavy duty coax (my shack is upstairs, so needs a shielded earth) to several ground spikes (there is room for improvement to the spikes even now). Thanks Kev, my noise levels have gone down dramatically with this.
Replacing the 4:1 balun with a 1:1 proved to be no good, but I learned by the exercise and now have a 1:1 put by. Heil had also written about the lack of mic earths on FT 920’s – you may need to take a wire from one of the pins to the outer casing screw. As this had raised some debate, I decided to leave it; the risk of shorting out the wrong wire didn’t appeal to me, and anyway with all the other changes, I could always look into it if a cure was not yet apparent.Damien suggested that maybe I needed a choke on the end of the feeder. This wasn’t included on the design I had followed, but I now have 8 turns around a 1” pipe right next to the balun. Thanks for this Damien.
Feeder: the plan I followed from the Net said it didn’t matter about the feeder length; oh yes it does! After purchasing a 259b from LAM Comms (who I found rather off putting when they offered another customer a brew, and hardly had time for me!) and checking the feeder, I realised how bad it was – on all bands.
It is improved, but a complete rebuild will take place soon, antenna and feeder.

My RF problems are now gone, but one Austrian contact had quite a chat to me. It turned out he was some sort of broadcasting sound expert. After listening, he said my sound wasn’t bad at all, but he could just detect a slight amount of RF. He asked if my tuner was near to my rig and I confirmed. He said I should put it 6 to 8 feet away which will probably cure everything. I have decided it is not practical, and the little bit that is apparent to him, is not audible to others – as I have found out. The feeder alterations started me thinking about the tuner; I had previously used the internal one but I had a Z11-Pro (now for sale) stood doing nothing. This did a lot better job, as Chris had previously told me it would. However, I’m not keen on flashing lights being partly colour blind (note - discrimination still rules on this point), so I decided to plunge for the MFJ-969. What a great piece of kit, can be fiddly but it does the job. So all this has certainly improved my abilities and knowl- edge, but you can imagine how I felt when I noticed the 920 then jammed on transmit. Fear of yet more expense gripped me before I realised that the footswitch had failed – and during a contest too. Heil did react to my mail when I slated them, saying they would send on a new switch FOC. It hasn’t happened, despite me re- minding them. I have now got used to the hand switch I made, but really I can no longer agree that Heil is quality and their follow up is worse.

During these progressions, I continued with my SOTA expeditions up until June. Some stick in memory more than others – and I’ve yet to see a bloke who suffers with anorexia as much I do on the hills!

I recall meeting up with the Furness Mountain Rescue Dog Handler who jokingly sent me the long way around a hill. I met him again at the top, and we had a good laugh. It was he who made me think of my Community spirit. Throughout my life I have always been active for the good of my community, and here was another
chance to put back some of what I had already taken. I had used RAYNET on many occasions when I was Chairman of the local Long Distance Walkers. I could join Raynet, and put something back. As soon as I got home, I made the move, and found that Chas Warr, my old Morecambe Car Club colleague was in charge – small world. Chas used to organise car trials and I used to or- ganise rallies as well as compete.
Chas asked me to go up the top of Gt Coum because no one else could manage it! I didn’t like that hill; I’d gone up the steep side previously, which really is a hands and knees job. I consulted Barrie, who very kindly furnished me with a more salubrious route. Getting up at 05:00 to get up there before the event was tough; on the top the cold was worse and when I found out there was an adequate Mobile signal, I felt like I’d been shat upon from a great height! I made it back to the Group event at Oysteber but was too knackered to operate.
I guess I overdid the Cross Fell SOTA - I haven’t been out since. I don’t really know the reason, but the regular Chasers doing the Doggy Baggers (Wainwrights, where you find them hung on trees) sort of put me off. I didn’t want to be shouted at by the same old circus – I wasn’t learning anything, and I’m sure they aren’t – which is contrary to the fundamental reasons for ham licences, to learn and experiment. I appreciate that it is good for the less capable, but these are not. I will start again now that I am over my anorexia, but I will be far more elusive – maybe take a CB or PMR!

Of course, one of my best SOTA’s has to be taking G1OHH up Whernside. Lynda was well into chemo and struggling, but didn’t give up because she knew what delight it would bring to Sue if she made the top. She did, and had many contacts. We didn’t know her before and have not met her since, but we put this into the sport for the good of others - and to improve ourselves. Sue is a top Chaser, and experienced the hardships of operating on such jaunts. Well done Sue, well done the contacts – you made 3 people happy. I didn’t claim the points either.

I nearly failed to remember my next achievement, Cross Fell saw me gain my 100 points of SOTA activating.
27kgs carried up many hills for the sake of progress!

My funniest encounter of the year must be the Irish Counties. Martin and I tried everything. Being so articulate with our antennas, we forgot our prey. “B’jasus, we only do sideband for the last 10 minutes - on vertical before the Guiness runs out !” You know, the Irish invented the wheel, and threw them into the sea when they wore to round, and were rescued by the English!

My improvements over the 12 months – many I guess, and I don’t think I could have achieved more in our circumstances. Licence, Raynet, SOTA, WOTA, contesting, work parties, awards, shack. Donations to the local community, SLRG (despite only 1 conversation of use, with Ian).
Thanks Sands for the opportunity over the last 12 months. It has been fun and humour all the way.
I hope the next 12 months will be a little bit kinder to Lynda and therefore myself and will allow us to get about a bit more.

Before I finally shut up, thanks for suffering my “outrages” I doubt that there will be more, I have clearly upset a few over the months. The policy of “Ignore and he’ll go away” only works where there is intelligence, and I don’t think I’m thick. I think it is time to back down, shut up, be seen and not heard and go QRT with the written word. Sorry to those I have annoyed uninten- tionally – but I have never been personal.
I hope this end of my year report, stats below, will open your eyes to how important Sands has been to me through this rough patch.

I remember what Paddy once told me:
Things are not half as bad as they were before they were as bad as they are now!

My QSL’d Stats:
SOTAS: 103 Activator points, 155 Chaser points
WOTAS: 14 summits activated, 60 summits worked
Logged Submitted Contests from home: WAG, SACCSSB, ARRL10M, RAC, WAESSB, HADX, UBA SPRING, UBASSB.
IOTAS: 36
Euro Location squares: 183
Countries 50, qso’s from 88











the shack

Posted at: February 04, 2012 02:27 PM