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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

Stan, I scoured my post for a personal attack, and could not find one. Motor wire is an exotic wire when used in a QRP radio kit. Compact, intermittent duty, motors quite often are built

Dudley, From page 8 of the rev3 QMX assembly manual: 14)? PCBs may be supplied with a 5mm empty “rail” down one or more sides. This is an artefact of manufacturing and should be removed. It

Hi Dudley, You just need to snap off the extra off cut. You will probably find that the? mini board where the 3.5mm sockets are mounted to has a similar extra bit. You just need to snap that off as

Dudley, Is that "line" cut into the board?? Is there a similar score on cut into the board on the opposite side? If so, it is a remanent of the manufacturing process, used to hold the board when

From the manual: The PCB may be supplied with 1/4-inch / 5mm approx of blank PCB strips along one or more edges; these are part of the manufacturing process during which the PCBs are assembled on a

I either got the wrong enclosure or the wrong main board for a QCX+.? The board is much wider than the enclosure.? There is a line on the board which is the size the board should have been, but

Thanks for all the SSB :) from The Hitchhiker's Guide to the Galaxy 73 DE muhsin TA1MHS

Hi strangely I had the same problem. I was using a uhf/vhf handhelds mike. after I found out that there was a LED connected inside the mike case I took it out now it is perfect 73 DE muhsin TA1MHS

I've seen this before when users have deleted the previous firmware before copying over the new firmware. The procedure is to just copy or drag over the new firmware and let the radio replace the old

In relation to this topic, is there a shortcut to the "tune SWR" menu? It would be very convenient to access this menu with a simple key press rather than navigate the menus, particularly when using

I just found another mic capsule on an Arduino MAX9814 board. Took that off to try again. Without calibrated, much better audio! Adjusted mic gain and compression. I set the noise gate to 30 and

Hi Myles, Yep, I tried the dial back as well. I eventually settled on mic gain of 65 but the audio was still rough without background noise. Thanks for sharing your settings. Are these setting post

Hans' suggestion of microphone can be found on the beta page: https://qrp-labs.com/qmxp/ssbbeta.html under the heading Microphone Choice.? Though I suspect this microphone is more sensitive than

Hi Hans, Yep, that did cross my mind.. In fact my first attempt was to use a PC gaming headset with mic. The audio gain was very low from the headset compared to the electret mic's I found in my

OR...one could switch to their trusty Yaesu FT-450D, as I do, during antenna "tuning" :0) 72, Bill, N4QA/4/QRP Oak Island ( OKI ), North Carolina, U.S.A.