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If the problem occasionally changes: Try applying heat, cold, and mechanical pressure, this might localize the problem. Perhaps flex the board a bit (but not too much!), this might show if it's a bad

Remove the GPS module if you installed it.? My power jumper under it was too big and it grounded out on the GPS antenna connector.? I had the exact same symptoms.? It came to life when I removed

Maybe Rob Sherwood will eventually take a look at the QMX+. -- John AE5X https://ae5x.blogspot.com

Hello Andreas Agreed, these would both be useful items. I have added them to my development list for the next firmware version. 73 Hans

Thanks Oleh! I'm quite confident my problem is further in the chain, as I see nice I and Q signals after the audio amplifiers = at the inputs of the ADC (attached screenshot, measured over the

I had same simptoms recently. Pull out smps, measure vdd to gnd resistance if around 2ohms thats bad, you have a short Measure ESR of tantals on vdd line of PCM1804 if any of the two shows over 60

Like I said ! Bruce says " *Don’t* get the pre programmed ones"

Hans, It is wonderful to be associated with an OUTSTANDING vendor. You guys are the BEST! Thanks, Sam Hanie, AC4OW [email protected]> wrote:

Hi Shirley Yes, I thought about that too. I used to scoff at the "excuses" that conventional measurement techniques of some performance characteristics don't work properly on SDRs compared to analog

Thanks for the pointers. I initi6had the current limit set to around 100mA and then increased it to 500mA, but still no joy. Stans explanation of what this component is doing is very useful, I will

SDRs are notoriously difficult to measure with conventional lab techniques, so it's possible the ARRL Lab got it wrong. I'm pretty sure they DID get that blocking gain compression number wrong. It's

Hi Sam It's good that there's a workaround however, I think it would be tidy for there to be a CAT command which returns the SWR protection (and other kinds of protection, like battery voltage)

The factory pre-programmed versions of the Si5351A are often not suitable because they have a different I2C address as well as default registers values wer up for specific output

Those output powers you listed, are very close to my QMX+ build as well. ?Looks normal to me. ?I've worked the world on this rig already! VE7SRF

Hello Shirley, Steve In my opinion the QMX should show considerably better strong signal performance than reported in the QST review. If you compare it with the QCX review for example, the QCX review

To put those numbers in perspective: the QMX doesn't have the strong signal performance of a state of the art 2024 design, nor should we expect it to at its price point. Aside from the number for

Same here, it all personal preference and some amount of how I use it. My favorite RX is still the QCX with the audio filter modded for SSB (Hipass 250hz, LOpass2400hz).? And a lot of close

Please note that the bandpass filters are only for receive, so they shouldn't be affecting your transmit.? The low pass filters, along with the two binocular toroids are in the transmitter path -

Also before someone gets triggered I was having a bit of fun here. There are gross generalizations, biased opinions, and otherwise non objective feedback included in my last post. Mixed with a few

The QMX doesn't have a speaker, and how good the sound is will also depend highly on the speaker you use.? I agree with those that have praised the QMX audio, but have also heard it be raspy and