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Hi Roger Where about are you?? If its doing everything except transmitting then you're probably right that the output transistors have failed because of transmitting without a load on it.? I'd be

Allison All good information, but can I politely disagree with a couple of your statements. *1)* Back when many of us were experimenting with H&P design it was common to obtain stability within 2 Hz

VFO instability and drift are symptoms of parts failure or implementation errors. Sometimes its just plain broken and needs to be fixed. If it does not have a regulated supply it will be unstable even

Mike, Looks like we are comtemplating the same problem.?? I have a highly modified DX-60A/HG-10 setup.? The HG-10 is stock and perfectly adequate for my normal 75M AM usage. However.... now I am

When time permits I will try the new code. The result with the last version was, unintelligible TX, and with tweaks and fussing it was "terrible audio can barely understand you".. Allison

An AC short at the output would be less than desirable and does increase the devices power needs and heating. Better would be 10 to 50 ohm series and then short to ground.? Or turn the oscillator off

Thank you all that took time to weigh in on this topic.? I have a few dds vfo's already (probably 5 including my Qrp-Labs arduino shield)? ?What I was trying to see was there a modern

Thanks, Alan.? At least there is some evidence that it won't self-destruct when AC-shorted! 73, Steve VE3SMA

Hi All, I am looking for someone hopefully local or at least in the UK to repair my 80m QCX. I will pay for the repair. My QCX was delivered fully assembled ?and worked perfectly for a time but will

My two lightAPRS units are presently being tested on the ground for a possible pico balloon launch in June. Thanks to the excellent instructions and engineering by the lightAPRS team, I had an easy

Steve, I ran a U3S with a TX muting that simply shorted the output of the coupling capacitor to ground via a BS170. It is still working. But the consensus was that it is not a good idea. I've no real

For those who are interested; there is now an improved version of the QCX-SSB experiment, it can be found here:?https://github.com/threeme3/ QCX-SSB ( https://github.com/threeme3/QCX-SSB )? In the

http://reversebeacon.net/dxsd1/dxsd1.php?f=0&c=n4qa&t=dx The QCX-17's lpf does attenuate output on 21060 kHz a few dB...could bypass it, I reckon. 72 / 73, Bill, N4QA

I am building a general purpose LF/MF/HF/VHF/UHF "crystal calibrator" using a Progrock and a QLG1.? But I am not sure how to deal with the RF outputs from the Progrock.? I do have them AC-coupled

Thanks Bill for your reply, yes you were correct I should have fully scrutinised the manual. As my old boss used to say "if in doubt go back and read the instructions". Unforetunatley the rig no

If you haven't been to one of these conferences, put it on your Bucket List. With possibly one exception, all of the speakers are top-notch, and the list of speakers includes Hans. His talk last year

I've been doing that successfully for years. No need for even the heat-shrink. Works wonderfully. Here's more ( http://www.nd6t.com/qrp/Microswitch%20Keys )

http://www.qrparci.org/fdim

One can hope!! Jack, W8TEE