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Hi John, Just got home and checked, they are BAT85S, so I suspect they're no good, since, at a quick glance, this model seem to have a reverse voltage of just 30V. Aaand 10pf of capacitance :-) Will

Just a short note to recognize Jeff Moore, W1NC, for his outstanding work in repairing QMX xcvrs. I made a mess of my T507 (SWR/PWR measuring circuit) and he cleaned it up, got it going properly and

Thanks for identifying the problem and correction. I have some 1N4148 through hole diodes - I've done some dry runs of the fix, and find that keeping the diode in place is an issue for me. Is there a

Hans: At this time are you recommending the mod for 20m-10m QDX?

I believe that the SSTV tone changes too fast for the stock QDX to follow. You might be able to do it by modifying the parameters that control the process. Hans made them available in the terminal. I

YEPPPP!

When I asked this question at the qdx launch I was told no because sstv uses afsk And digital sstv requires big cpu processing. I am not sure however, maybe the QMX could do sstv. I believe it has a

Hello Steve, how are you? What is de IQ mode??What is de IQ mode? Where is it deactivated from? Thank you 73, Juan LU9CYV

Thanks for the great write-up, Hans and John! These seem to be about a dime a piece or $4 for 100 at digikey: https://www.digikey.com/en/products/detail/micro-commercial-co/1N4148WX-TP/717197 It's

Hi Klaus. Glad you are up and running again. It might be a good idea for anyone who has experienced the problem to indicate whether your QMX rev 2 is a low band or high band unit. May give a bit

This can happen if you enable IQ mode. Make sure it's disabled in the System Config menu. -- 72/73 de Steve, K9NUD https://youtube.com/@learnhamradio

Wow! What a bunch of very interesting reply's? to my question. I thank you all for your input. I will be reading the articles you gave in the links. Again, I thank you for your discussions. And yes,

Mine does that every now and then. A quick power-cycle fixes it. Another bug, I reckon. I haven't replicated it enough to report it. -- 72/73 de Steve, K9NUD https://youtube.com/@learnhamradio

Incidentally, I mentioned "deep QSB" which you'll hear other ops mention from time to time. It's hard to appreciate it until you see the audio waveform. Here's a sample from my subtitling

Nice work, Klaus I stole your photo, which is 84.2dB better than mine, and put it on my new article see https://qrp-labs.com/qmx/qmxrev2.html - with all due credit to you of course :-) 73 Hans

Dear friends, I have replaced the broken IC402 and my QMX is up and running again. As mentioned I have also implemented the modification by adding a small 1N4148 between G and S of Q508. I had some

Schottky diode has lower drop out voltage but also lower max reverse voltage. So it all depends on what is needed. HNY -- 73 Bojan S53DZ

Hi Rick, These are roughly the values that I also had after the build. After a bit of tinkering, I get 4.5 to 5 watts on all bands. What I have observed is a noticeable RX insensitivity on the 10m

Bob, as I understand it there are both Analog and Digital formats, so it may be possible to accomplish one formatting or another to accomplish SSTV. Justin

Adrian, What part are you thinking of using? A 1N5711 for example will not be able to handle the current peaks, but it has a nice low capacitance. A rectifier for a power supply could handle