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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:

My QMX+, a factory 12v build,? draws 160ma at 9.28v, the voltage at which I operate for tx/rx. for all modes. Transmit current is consistent with my readings. The various PDF manuals I have searched,

The more complete short story, as I understand it: Because of early design decisions, the microphones connect directly to the microprocessor's ADC inputs. In most radios, there would be a microphone

Hi all, I’ve completed assembly of my 60–15m QMX. It powers on and passes the RF and SWR sweep tests. Test ADC I/Q shows sine waves, particularly on 60m. I can hear what sounds like FT8 on 7.074

That is something that would be of interest. The parts I've used would, but they are beamlead and extremely small.? THey would require a board for sure and precision assembly. The part that has seen

Forgot to mention.? The setup is TXing into a dummy load.? No antenna, very short coax. With the U-Blox M7 GPS the timing is such that I can decode every transmission.? But instead of starting the

This means your supply voltage is 13.8 V, *wrong* ! There are several warnings in the documents not to feed a 12 V QMX by more than 12.0 V. This looks like a broken controller IC203. Is the current

Mike and Andy, I am very pleased with how the QMX+ turned out, it's quite an amazing transceiver especially for the price. I spent considerable time adjusting the spacing on the BP toroids and the

Hello Ted, I think it's ok to wait for the answer before doing more. BTW you may find information about the start up process here ( /g/QRPLabs/wiki/36878 ). I guess the most probable

Is it possible to choose the active grounded method for PTT via the Menu or is it necessary to utilize a terminal program. ?If so,I could use some help finding the correct menu item! ?Thanks.

Could these GaN FETs simply replace the BS170s in the QRP Labs kits?? Maybe get JLPCB to make a postage stamp sized board to replace the current block of BS170s.

The wiki page QMX QMX_p kernel failures ( /g/QRPLabs/wiki/39740/222936 ) has been updated by @Ludwig_DH8WN <DH8WN@...>. Compare Revisions (