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Thank you for the resource.

Yes. It's a classic tandem match. https://www.giangrandi.org/electronics/tandemmatch/tandemmatch.shtml 72 de va3rr

Please read this ( /g/QRPLabs/message/145820 ). For DC all is connected to GND.

Hello, I am hoping I could get some assistance. I am currently building a QMX. I just installed the SWR bridge and I have continuity between all the connections. Is this correct or was it only

Jeff Mooe just does good work can you recomend a Bofend mic to use.

Allison would be far more qualified than I to judge how well a part will do as an RF amp, and I haven't looked for low voltage parts that might be used to replace the BS170. But just looking at the

I can recommend Mr. Jeffrey Moore he reparied mine even though? I tried to repair it my self.

Thank you for clarifying the STM32 uses a 12 bit ADC. I guessed at 24 bits because of the 24 bit sound card capability. That, however, doesn't nullify my thesis. -Chuck Harris, WA3UQV

Anybody know what those two shiny blobs between R205 and R208 and Q204 and R210 are for? They show up on page 2 of the schematics as JP202 and JP204. Thanks.

Thanks for the offer, but I don’t have a 3D printer. Ken

Jeff certainly does good work! If you have access to a 3d printer, and don't want to use the pvc supplied in your qrp guys mic kit, I can share the shell that I designed for it. Congrats on getting on

Hi Pierre. I also recommend watching that video, especially the part where Hans shows you it is not necessary to clean out the holes. The toroid leads can be soldered to the top side of the board and

Based on recommendations on here, I sent my dead QMX to Jeff Moore disassembled in a sandwich bag. It is now back home after he found multiple issues with it (factory assembled). All is working as

Looks similar to mine 160 5.3 80 5 60 3.5 40 3.8 30 2.5 20 3 17 3.9 15 3.8 12 1.4 10 2.5 6 1.7

I just set set CW speed to 0 and touch the paddle :-)

A careful, second or possibly third, reading of the manual revealed the following: "A minor difference is the Band Configuration screen, which is NOT available via the LCD menu.... Sorry for taking up

Chuck, Yes, on the QMX the microphones are tied directly to the ADC inputs of the STM32F processor. A preamp may improve things by slightly increasing the voltage seen by the processor and also by

I'll try this -thank you!

The QMX uses about 1W on receive so ~83mA at 1v, ~111mA at 9v and ~143mA at 7v. 160mA at 9.28v is a smidge high, but perhaps not enough to worry about? When you run diagnostics, does the duty cycle

Thanks for the great input. Mike Krieger [email protected]> wrote: