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I would first test the mics you get.? I also got a mic kit from Eric, and the mic element in it performs very well, with good snr, sensitivity and dynamic range.? But they are very inexpensive mic

Depends on the board. QRPLabs kits use through-plated holes in their board fab, as do most other kits.? In this case, you should solder on whichever side of the board is most convenient,? usually

Using an auto tuner with a QMX at full output can damage the final transistors. As the T1 attempts to find a good swr your qmx will be subjected to high swr. If you use a lower voltage for tuning it

I've ordered two external mics that the forums show work with the QMX+ - from QRPGuys and from Erik AD7OV. Should I still install Han's mic or leave it uninstalled? Thanks, Roy de K2RMA

I've successfully have built many kits, but I always wondered.... I push the thru-the-the board component leads from the top of the board thru to the bottom of the board. I've always wondered, for

I think you mean Low Pass Filter toroids.? Changing the bandpass toroids will primarily affect receive sensitivity.? ?Adjusting LPF toroids will primarily affect output power and harmonic

I did a complete factory reset and re-entered all the information. I adjusted Sys. Frq. with settings from a spreadsheet i generated some time ago.? Those settings are not used when the GPS PPS is

Not being able to leave well enough alone I took one last stab at tweaking the band pass toroids. The biggest change came with the 20/17/15 meter coils. I gave up a bit on 15m to increase power on

My QMX+ with QLG3 also draws about 160 mA at 9V. As far as I can tell it is working ok. 73/72 John M0JBA wrote:

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