AmateurRadio.com

Announcements:

• Merry Christmas and Happy Holidays to all.
• Bill, KA9WKA, joins the podcast this evening.

Topics:

• Richard reviews a new ham radio podcast, wAVEGUIDES pODCAST, hAM rADIO…wITH a tWIST!!!, by Pete Landry, VE2XPL.
• We then discuss various podcasts:
  • Hacker Public Radio
  • Eerie Radio
  • The Linux Action Show
  • ICQ Podcast
  • Ubuntu UK Podcast
  • Linux Outlaws
  • Resonant Frequency
  • Practical Amateur Radio Podcast (currently on hiatus)
  • TuxRadar
• Richard test drives GNOME Shell and Unity after hearing about them on the Going Linux and Mintcast podcasts. It seems Ubuntu 11.04 will ship with Unity as the default desktop manager. He installed GNOME Shell on his eMachines test computer running Ubuntu 10.10. You launch GNOME Shell with command “gnome-shell –replace”. After a reboot, your default desktop manager will return.
• Neither Russ nor Bill have played with either one, but that doesn’t stop us from discussing them at length.
• Russ discusses Android applications for hams:
  • Callsign DB
  • Ham (Solar/Band conditions and QRZ lookups)
  • HamSatDroid satellite tracking
  • IRLP Finder
  • DX Cluster for Android
  • Amateur Radio Call Log
  • Echolink
  • Ham Radio Apps for your Android

Feedback:

• Richard, KR4EY, writes that Morse code is not dead! And 30m is his favorite band.
• Burt, K1OIK, says Richard looks awful cute with that pink bow in his hair. (We’re still wondering about that one.)

Contact Info:

• Contact Richard at [email protected], Russ at [email protected], or both at the same time at [email protected].
• Listen to the live stream every other Tuesday at 8:00pm Central time. Check the LHS web site for dates.
• Leave us a voice mail at 417-200-4811, or record an introduction to the podcast.
• Sign up for the LHS mailing list.
• Sign up for the MAGNetcon mailing list.
• Thanks to Dave from Gamma Leonis for the theme music.

Music:

• “Fat Blue Christmas Swing Medley” by Fatblueman from “A Fat Blue Christmas”
• “Kiyoshi Kono Yoru (Silent Night)” by Fatblueman from “A Fat Blue Christmas”

I have had a bit of a change round in the shack recently. Since getting the Kenwood TM-D710 which is used for 2m FM which is the vast majority of my VHF activity, the Icom IC-910H has really been under-utilized. 70cm is a dead band here and there isn’t too much 2m SSB activity. Besides, I never really liked the Icom. So I decided to swap it for an old Spectrum Communications transverter that I have and sell it in the new year.

The Kenwood has been moved into the “second rig” operating position. And the desk mic I used with the Icom is now attached to the Kenwood. I had some CAT5 UTP network cables which are terminated in the same type of plug Kenwood uses for a mic connector, so I cut one in half and made up a cable for the desk mic. Despite being unshielded (UTP stands for Unshielded Twisted Pair) there doesn’t seem to be any RFI even at 50W. And the reports I have had so far suggest that it sounds good.

The Spectrum transverter runs about 20W output. This is less than I would like for SSB. My plan was to set the transverter drive so the peak output was 5W and use it to drive a 50W linear amp that I have. But when I set the power to 5W, as soon as I put the cover on the case it dropped to 1.5W. So I thought that perhaps the whole thing needs realignment.

Unfortunately it did not go well. The transverter, which I bought umpteenth-hand in a private sale some time ago, had obviously suffered the depredations of the ham-fisted twiddler. Two of the ferrite tuning cores in the Toko coils were cracked and could neither be adjusted nor removed so they could be replaced. Despite this, the transverter receives pretty well.

However, while trying to realign the transmit side to solve the problem of changing power output when the case cover goes on, I noticed that there was often power out when the key was up. There was clearly some instability present. Although I could adjust the trimmers so there was no unwanted output, I could not eliminate the changing output as the case cover is put on. I do not have the test equipment (a spectrum analyzer) to be sure that the output is clean and I started to have doubts about the whole thing.

I did not want to risk wiping out the neighbour’s TV reception whenever I use 2m SSB. So I decided to scrap the transverter and order an XV144 internal transverter module for my K3. It is on its way, and hopefully will arrive in the UK before the increase in VAT takes effect.

I started up my APRS gateway this morning and noticed an unusual symbol on the screen. I clicked on it and discovered that WE7U had posted an object to mark the epicentre of a minor earthquake measuring 3.6 on the Richter scale that occurred about 20 miles to the south of here at around 2300z last night.

It was felt in nearby Workington and even across the water in Dumfries and Galloway with some people describing it as “scary”. We were completely unaware of it. But now I know what happened, I recall that just after we had gone to bed I heard a noise from the attic like someone was up there and stood heavily on the rafters. I said to Olga “did you hear that?” and she said she thought it was a heavy vehicle passing on the A66. So that was how the earth moved for us.

It’s the holiday season and we had time for one more podcast this year. We want to wish everyone a Merry Christmas, Happy Holidays, and a prosperous New Year in 2011. Linux in the Ham Shack has undergone a few changes and weathered a few challenges in the last 2+ years, but we’re still going and expect to be going for a long time to come. We want to thank everyone for their continuing support and continuing listenership. We would not have a podcast without you, and we wouldn’t know what to do if you weren’t there.

So spend time with your families and enjoy all of the wonderful things that life brings at this time of year, and hopefully all the year through. And if you find the time, curl up on the sofa with year headphones next to the roaring fire, crank up LHS and sit back and enjoy our gift of holiday cheer.

73 and Happy Holidays de The LHS Guys

In all the years I have been a ham and home constructor one item of test equipment I have never possessed is a frequency counter. Whenever I have needed to test if something is oscillating I have just stuck a bit of wire in the antenna socket of a receiver and listened for it, and if I have needed to tune an oscillator on frequency I have just tuned it for zero beat using a receiver that has been adjusted as best I could using WWV or similar.

Recently I decided that it would be useful to actually have a frequency counter, preferably a really accurate one. I know that it is possible to buy secondhand lab grade frequency counters on eBay. The trouble is that when your shack / workshop is the size of a broom cupboard there is no room for boat anchors. I didn’t even have space for one of the inexpensive desktop frequency counters that are available. I decided that I would have to make do with a hand-held device. Farnell had one, but the price of £140 was rather too steep given the amount of use it was likely to get. I was about to give up when I came across the Yaege FC-1 being sold for about £30 on eBay.

My initial thought was that this was such a cheap device that it could not be very accurate and was probably not worth getting. The specification gives the time base accuracy as < 5ppm, which is worse than most ham radio transceivers. However, a bit of searching produced a PDF copy of the manual, which revealed that the TCXO module is user adjustable. I figured that I could get better than the quoted accuracy by regularly calibrating it using my rubidium frequency standard.

I ordered one from one of the Hong Kong traders and it came in just over a week. The antenna socket is a male SMA, similar to that used on the Chinese VHF/UHF hand-held radios and the opposite type to that commonly used by Japanese manufacturers. A short UHF rubber duck antenna is supplied with the counter. I ordered a BNC adapter so I could use my BNC whip antennas and also attach BNC terminated test cables.

I connected it up to my 10MHz rubidium frequency standard and found that it was already within a couple of Hz of the correct reading. The picture was taken before I set the gate time to 1 second which is necessary to get a reading down to 1Hz.

The time base oscillator adjustment is behind the battery compartment so you need to run the device from the charger while adjusting the frequency. You can see the adjuster in the picture on the right. Rather like adjusting the master oscillator in the Elecraft K2 the adjustment is incredibly touchy. The tiniest amount of movement can change the reading by a couple of Hz at 10MHz.

It turns out that it is not worth being so picky. The reading does slowly drift by a few Hz over a period of several minutes so you are never going to get absolute accuracy with a device like this. Nevertheless it is better than advertised and pretty good for the money, in my opinion.

One feature of the Yaege FC-1 that you don’t get with most frequency counters is a signal strength reading calibrated in dBm, as you can see in the top photo taken while I was transmitting a carrier on 145.500MHz. I wasn’t able to check how accurate the actual reading is but as a relative indicator the dB measurements seem quite accurate so this could be quite a useful tool for making antenna comparisons. It turns the frequency counter into a digital field strength meter.

Although it isn’t a lab grade high accuracy frequency counter I think the Yaege FC-1 is a useful addition to my electronic test equipment and is extremely good value for money.

Quite frankly I can’t think of anything worse than choosing QRP Kits to ‘lay down’ as an investment, rather than build. Mind you it doesn’t look like they need to be put in the cellar for very long!

Screenshot of Warbler contact to Alabama

Last night I used the Warbler I finished a few months ago and had a very nice 40 minute QSO on 80m with Ken, KI3N, in Oxford Alabama.  First, it great that conditions were good enough for us to chat for 40 minutes using PSK31, but when you consider that the distance between us was about 970 miles then that made it quite an achievement given the band.  I was using the Warbler, putting out 3W now after some slight changes, and the 88ft doublet tuned with the homebrew ATU.  Ken was using 40W from an Icom IC-756 Pro into an 80m dipole.  The screenshot above shows what I was receiving.

Even though the Warbler is rockbound and uses a direct conversion receiver its performance is very good and makes it fun to use.  This was the furthest contact I have made so far with that transceiver.