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It would be similar to this technique to protect ADC inputs with a couple Schottky diodes: https://www.analog.com/en/technical-articles/protecting-adc-inputs.html

FYI I use my cell phone and have no issues!

*Hello Bruce and all, I think I will spend my last dime on transmitter and antenna and would not afford GPS. Is there any online clock which will transmit the GPS timing free . And I would not want to

Hi Mustafa Maybe look at the U3S. That is transmit-only, and with the addition of the QLG2, bullet-proof. Roger 8P6RX ?Get BlueMail for Android ?

I have a QCX +5W and it runs WSPR 24/7 You can set the clock manually after start up and you can afford to gain or lose a second before reception of your signal is a problem. ?Timing is controlled

*Hello there , I am optimizing everything for my condition. I looked at WSPR sites and found most contacts are for 20 meters band. I will build a 20 meters loop antenna for in room use or on balcony

I recall at one point folks in the Bitx20 boards were discussing a simple hack to avoid blowing out eardrums on transceivers lacking AGC - They would simply use a couple diodes between the headphone

Thanks for taking the time to help Rick. 73 Ian

I strongly recommend using a VERY thin layer of thermal paste between the BS170’s and the PCB. Mechanical surfaces are not perfectly flat - neither the flat of the FET package nor the board. A thin

Thanks for the advice John and Nick, testing did indeed show that D3 and D6 went to 0 (or as near as dammit!). I swapped L9 with L5 and confirmed continuity with R9 and C11, however the same fault

I pick up a rock and either use a girth hitch or a slip-knot (which also happens to be a hitch now that I think about it) to tie the para-cord around it.? I don't wear a helmet... or suspenders.?

Ah yes - makes sense. Mainly I was worried about IC503, which is over the discharge surface and gets very warm.

I've been following this thread and others regarding what takes out the Finals. I've built 2 QDXs and one QMX. Both the QDX rigs blew the finals within a short time of building. I don't know for sure

The flat surface of the BS170 contacts the surface of the PC board.? Being a six layer board this should dissipate heat better than the QDX.? (I do put a little thermal paste on mine to help

Hi Bruce, "Good on ya" for making an extra effort to avoid spreading toxic materials! I use 15 ml eye drop bottles full of heavy material.? They fit nicely inside the 1-inch (nominal) schedule 40 PVC

I am out of ideas, Ian :(

Frank, No problem here with heat even in a chat mode with key down time of 10 minutes or more. I think the QMX doesn't get as hot as the QDX. 73, Cliff, AE5ZA

Hi all, I'm a little bit afraid to fry the finals when working in digimodes (long txing). So, I wonder if there is any construction possible to dissipate the heat of the finals to bottom cover of

Hi all, glad to inform you, that my QMX is up and running on all bands. Power output is between 4,5 and 5 W. Thanks to all for helpull hints! 73 Frank

I use a small cloth bag filled with sand.? Its fairly soft. I still have my construction hard hat a white one, its years old. -- Allison ------------------ Post online only, please no email.