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Ron, are you sure COM5 is related to the QMX? How did you identify the port? Could you show please the device description and the Hardware IDs of this port? Did you use PuTTY with the default

Yes I did that, this I tried multiple times with the same result.

OK Jerry, Until the QDX/QDM came along my main SDRs were Softrocks with soundcard ADC. They definitely have a hole in the middle. So Anders is correct, the direct coupling to the ADC enables the DC

I run my 12V build with a buck-boost converter and its output stays constant between 6 and 24V (IIRC). I chose 12V builds because my 12V accessories will work from the same source; they will not work

How did you copy the file?? I have seen recommendations to copy-and-paste rather than drag-and-drop the files. Glad you got it working again. 73, Don N2VGU

Did you hit the enter key after connecting to PuTTY? It will have a black screen until you press the enter key to activate the menu system.

Ludwig I should have defined this correctly, the on power current is 70ma. I did connect to the QMX with putty, com port 5, but there is no menu as described in the manual, just a black screen. 73 Ron

Many SDR's use a PC soundcard, with audio going from the SDR into the PC. That audio is AC coupled through a capacitor inside the PC, knocking out any DC component. The QMX has DC coupling between the

Hi Allan, I don't agree fully. My understanding is as follows. If you receive a signal with the same fq as the LO, the Tayloe mixer will charge the four capacitors differently to DC levels according

There's a Wiki article on the QRP-Labs Wiki with instructions on how to do this.? I have *not* gone through the instructions myself, but I assume that they are accurate.? Link to the Wiki article -

Hi Ricky, A Terminal emulator software is used to access the QMX configuration and diagnostic screens.? I use PuTTY on my Windows 10/11 PCs:

Hi what is the PC software that I need to use to get into the QMX settings etc. I can access on the QMX screen but I see other people's screen shots of a PC Version. Many thanks ? ?

I was able to snap off the excess on both sides with little effort. Thanks for the information, first time encountering such an issue. Problem resolved. -- Michael, KG5UMH

Looking forward to further progress on this. If it was only 40-20-15-10 that would be fine with me.

Can your power supply deliver the additional current when SSB starts?? If it can't the voltage will drop and all sorts of strange things could happen. All the same better that than generating smoke.

Good to hear that you have it going.? Even better to hear that my suggestions worked :) One thing with fitting the 1N4007 diodes is that if you fit them as suggested in the manual, with the end of

Anders, There is no reception at 0Hz. A DC spike might be seen, most software has a filter to remove that. A CW signal or AM carrier will not be received when exactly coincident to the LO. (Note in CW

Hi all It is not really a hole. The signal is received at 0 Hz beat but it is drowned in bias and low-frequency noise in the following amps. 73 Anders SM5KAE

if you are still with the non SSB software you can only use the COM Port once. So WSJT-x will not find the QMX, when the Com port is used i.e. for a logging programm. Not a big deal as the logging

Hi Steve Yes, and I am still experimenting (it works already, just for a better BPFs) First I tried 40-10 on QDX then on QMX for LPFs: - Use the same L and C values from QMX+ - Re calculate the toroid