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• Licence validation period extended
• GB3WX 6m/10m crossband repeater
• WA6ITF retires from Fox TV
• Whip Competition
• Frequency Measuring Test
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• New Bent Element Yagi tested
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• Trinidad & Tobago 5 MHz operation?
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Your feedback, Hints, Tips and Tricks, and Alun Cross begin_of_the_skype_highlighting     end_of_the_skype_highlighting, G4WGE joins use to review Microwaving

I just submitted my meager log from last weekend’s WAE RTTY test — just 45 QSOs and a whopping claimed score of 1,530. I only operated for a few morning hours (between 1125-1345 on Saturday and 1245-1700 on Sunday) in order to give DM780 a try at good ol’ fashioned 170/45 Baudot, a mode I haven’t worked since days of yore with the trusty old KAM and a terminal program. High time to give the new technologies a try, said I.

The DM780 + HRD Logbook combination did fairly well, considering HB9DRV himself says “HRD/DM780 is not contest software.” As such, there is no easy provision for sending or receiving QTC info for extra multipliers, and it wasn’t clear at first how to get DM780 to increment serial numbers in the exchange field (put them in [brackets], I finally discovered). Using a fresh database file for the log (as I do for every contest) lets me use the logbook’s Awards Tracking and Worked Status functions to keep an eye on what stations and countries I’ve worked on each band, but I have to be careful to individually set the other databases (previous contest logs, plus my master logbook) to not figure into the worked status lookups (this is one in the Logbook Databases control panel).

Another limitation from a contesting perspective is HRD Logbook’s inability to output Cabrillo files for log submission after the test, a feature that was available in HRD v4. So I have to use another app (SP7DQR’S nice ADIF2CABR freeware app) to convert an ADIF export file into Cabrillo format, and that only after doing a search-and-replace on the ADIF file to change the tag to that the conversion app is looking for. No biggie, I mud-wrestle data for a living, so this is just another day at the office…

That said… I’m familiar and comfortable with DM780 and HRD Logbook so it all worked just fine for me.

I worked the first day with the K3 in DATA A mode before remembering that AFSK A mode allows DUAL PB filtering to peak the mark and space tones. The DM780 waterfall screenshots below illustrate the difference far better than words:

K3 set to DATA A mode. BW = 400 Hz, Fc = 1530 Hz

K3 set to AFSK A mode. BW = 400 Hz, Fc = 1530 Hz, DUAL PB enabled

Note that the overall bandwidth in AFSK A mode is quite a bit narrower, even though in both cases the K3 was set to 400 Hz, and the distinct notch between mark and space tones is indicative of how effective this filtering mode works. Back in the pre-DSP days with the TS-930S and JST-135/245 transceivers and NRD-525/535 receivers, I used to use a Datong FL-3 audio filter which had a RTTY mode that accomplished the same thing, albeit at the AF stage.

DATA A and AFSK A each have their advantages. In DATA A (or AFSK A with DUAL PB turned off), I can open the bandwidth up and see a good portion of the band (I generally set DM780 to display 3 kHz on the waterfall and set the K3 bandwidth to match) and all the signals on the air, then select the desired signals with a point-and-click like I do in PSK31 mode. If QRM is a problem, I can crank down the bandwidth and shift the passband center frequency to pass only the station I’m working; once the QSO is complete, a quick tap-twist of the K3’s shift control recalls my wide settings and I’m back on the hunt. I rarely touch the VFO dial, all tuning is done with the mouse.

In AFSK A mode with DUAL PB enabled, however, the K3’s center frequency is fixed at 1530 Hz so all tuning must be done with the VFO. Also, the bandwidth is limited to 500 Hz max (which as shown in the image above is a bit less in practice, more like 250 Hz or so) making VFO tuning very touchy and slow (the 1 Hz fine steps must be used) and renders the waterfall useless for spotting other signals. But the filtering advantage is huge, especially in a contest scenario.

For me, it’s a no brainer — in the latter stages of the WAE contest I found myself using DUAL PB almost exclusively, occasionally switching it off and opening up the bandwidth if the band was quiet or if I’ve already worked the majority of the stations I tune across, since clicking on a waterfall makes it far easier to hunt and pounce.

DM780 facilitates the switch from narrow DUAL PB to wideband waterfall tuning easily: I first activate the center frequency marker (Tools>Program Options>Waterfall menu, or F8) and set it to match the K3 DUAL PB center frequency (1530 Hz). After finding a signal on the waterfall and clicking on it, I can then click the C button just above the waterfall to center it at 1530 Hz (HRD offsets the K3 VFO frequency to do this), and then activate the DUAL PB (press/hold the #6 key on the K3 keypad). The bandwidth is narrowed to 500 Hz, and the mark and space tones are perfectly positioned for decoding. To switch back to wideband, press/hold DUAL PB, and tap XFIL a couple of times to select the 2.7 kHz filter or use one of the filter presets to select my standard wide data setting of 3 kHz. This can perhaps be simplified to a one-button process using the new macro feature Elecraft just added to the latest firmware version; I need to check into that…

Note to K3 users: when working RTTY in AFSK A mode, either the radio or DM780 needs to be set to reverse, as AFSK A demodulates the lower sideband while DM780 looks for the upper. DATA A, however, works in the upper sideband.

Welcome to Handiham World!

Image: Matt, KA0PQW, and the bucket truck lift operator, Jeff, KC0UOW, ride the bucket up to do some antenna work. Photo courtesy Don Rice, N0BVE, taken during Matt’s antenna work in October. Don had just completed some work on Matt’s 220 MHz antennas, and Matt was headed up to do the final inspection.

It’s always a good idea to get your antenna work done before winter, especially if you live in Minnesota, as Matt, KA0PQW does. One may be blind, but that doesn’t mean you can’t do antenna work. Matt directs and does hands-on work on his antenna projects, and has some great helpers.

I have always recommended having at least one helper available for any antenna project that involves working on an elevated antenna system, whether it is on a roof or high on a tower. The reason, of course, is safety – if something goes wrong, the second person can provide assistance or call for help. Besides, most of these projects really do require at least one more set of hands – and eyes. You can use a spotter to check for hazards like power lines and buried pipes or cables. This goes for any ham radio operator, whether they are blind or sighted. I shudder to think of all the times I have not followed my own advice, but in my defense I was young and stupid. As a teenager, I navigated our family home’s rooftop like a monkey – stringing antennas, hurrying down to test for SWR, then running back up the ladder to the roof to make adjustments – all without anyone else around. When I bought a used tower, I was up and down that thing dozens and dozens of times. I did buy a Klein lineman’s belt but even so, I worked alone all too often. The closest call I ever had was on an old telescoping mast. I had just finished my antenna work and stepped onto the ground when the steel cable holding the top section snapped and the tower telescoped back down. A few seconds delay in getting off would have meant amputated fingers and toes! Worse yet, I did not have a helper around.

Well, I have learned a lot since then. I ask for help, so that I have someone there to do antenna work as well as to help us both stay safe. I plan to stay safe – and you know what? Staying safe means more happy years of ham radio fun!

We have topped 40,000 downloads! Thanks go out to all of our listeners and live webcast attendees for making Linux in the HAM Shack as popular as it is. Give yourselves a huge round of applause. We're also well on our way to our donation goal of $750 so we can buy booth space and Internet access at the Dayton Hamvention in Dayton, Ohio, in May of 2010. Thank you for all of your donations. Please keep them coming as you're able to send them in!

In this episode, we address listener feedback and comments, and then in a burst of inspiration invite listeners from the chat room to come onto the program for a lively and very fun roundtable discussion. Topics were varied, from portable antenna design, to life without Red Bull; from the HAARP VLF array in Alaska to D-STAR, PACTOR and other digital ham radio communication modes. And since I was on meds and Richard was off his, things got a little crazy towards the end.

We hope you enjoy this episode of Linux in the HAM Shack. Please leave us comments or questions on the web site or via voice mail at 888-455-0305. And send your best wishes to Bill, KA9WKA, who has taken on the responsibility of getting LHS's show notes out in a timely fashion. Thanks, Bill. You're a lifesaver!

73 de Russ, K5TUX