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Frome the QMX SSB page at QRPlabs "All development has been done with this particular Electret microphone from Digikey, part number

Here's how microphone sensitivity is measured: https://www.analog.com/en/resources/analog-dialogue/articles/understanding-microphone-sensitivity.html A lower negative dB (such as -24dB) means more

Mic Output levels... The -44 db Spec is due to the modern digital devices today, so that the Mic doesn't overdrive the ADC/DAC, as used in most modern SDRs, as well as SmartPhones/Tablet/Notebook

copy yes but never drag. There were reports about problems after drag the FW into the QMX folder.

It is never necessary to delete the current firmware from the QMX, but I don't know if it is a failure mechanism Gary W9TD

Mehmet, the reason for this is described also on page QMX QMX_plus SSB settings ( /g/QRPLabs/wiki/38982 ) (see Noise gate). 73 Ludwig

Hello Mehmet and all, if you need significant more than 55 dB audio gain the micro is not sensitive enough for QMX use. You will find something about this on page QMX QMX_plus SSB settings (

The wiki page QMX QMX_plus SSB settings ( /g/QRPLabs/wiki/38982/219538 ) has been updated by @Ludwig_DH8WN <DH8WN@...>. Compare Revisions (

Yeah, I just took a snippet of the 20m band. :-)

As I said, I can't judge whether that plot looks good or bad. Some of Hans's plots looked similar. Everyone's radio will likely have different looking plots as the hardware has variations. -- 73, Dan

Your band configuration page looks very different from mine. I can see all of the bands at once. -- 73, Dan - W2DLC

Thanks!

I forgot to add the band config screen.

Hi Daniel, Thanks for your suggestion. I have set the band edges and center frequency as recommended. The plot doesnt look any better.. Mel. M0KMD.

Tony, I know from working in the audio/video production industry that there are high quality and low quality electrets. Usually, but not always, you get what you pay for. Mine is a cheap Baofeng mic,

I just did a bit of digging on electret specs. It seems that most of the ones I looked at had sensitivities down around -44 db (volts/Pa) with SNRs in the neighborhood of 60db. But the one that Hans

Mehmet,? I used the band configuration menus to move the band edges closer to the legal band edges, and then set the band center to 14.175.? Then set the mic levels carefully, then did calibration

Muhsin bey, selamlar :-) Thanks for the tip. I'm using the electret capsule removed from other hand mics or other scrap pcb's. No LED's on any of these. I wonder how significant it is that my plots

Ok thanks for the confirmation. I only suspected a microcontroller switching fault is that the failure happened after first performing the SSB calibration into a dummy load then testing SWR with the

Hi Steve, You can't measure many of the square waves created in this radio with a 100MHz scope, and expect them to look at all like a square wave. A square wave is comprised of odd harmonics of the