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Bill and Doug, Here are a few notes that may be of help to understand, measure and improve your SSB output power: 1) SSB output power is much different than CW or Digi power.? Only the highest peaks

Chris, during my last SOTA activation, I used a 20.60 m long EFHW on the MTR3B V4 for the 40/20/15 bands without any problems. ZL1TM was also logged on 15 m despite unfavorable conditions. I suspect

-33 dBm is around 14 mV pp, enough to trace using your oscilloscope. Also without amplification by IC405 and IC406 (amplification = 1) there should be enough input voltage for the PCM1804 for good

Please use Google or your favorite search engine or ai assistant with "describe PD trigger cable functionality" for details. It has a tiny chip molded into the connector which negotiates the desired

You can also clear the 'S' by entering and exiting the menu system, no power cycle required

Ok. ?I will check that this evening. ?But even when the signal level was at -33dbm there is no gain from the input to the output of ic405 or ic406, ?in fact I believe there was nothing at all on

Heinz, the antenna is a 20m long EFHW and, as is well known, can be used on 7 and 14 MHz. The resonance circuit (Fuchs circuit) transforms from 50 ohms to an impedance of approximately 3k ohms. I've

Hello Ron, if you see two files in firmware upgrade mode (jumper set) the QMX starts for the first steps. Firmware 1_00_027 is loaded already. When jumper is removed the QMX should start when pressing

But VDD isn't at the pin header to sub-PCB #1. Or did you check also for PCB #2? Check voltage at the pin PWR_ON (sub-PCB #1). There should be a voltage near the input voltage when volume encoder

I have not been able to see on the initial first power up any means of loading firmware on my QMX+ radio. I was able to see some evidence of 2 files on E drive which is the USB drive on my computer by

I can confirm that voltage does make it to plug in PCB #1. I did notice that VDD has continuity to ground when checking for shorts on the pin header. Nothing visible was identified

Or a processor pin bent? under and only intermittent contact. -- Allison ------------------ Post online only, direct email will go to a bit bucket.

DROK and others make buck-boost units which will increase OR reduce the voltage input to output. I use this fixed-voltage one with my 4S LiFePO pack which can go as high as 14+V fully charged, or

Realy not when pressing the volume encoder? In this case please trace the voltage from the socket to plug-in PCB #1. Via the Wiki document you will find a sketch of the contacts to the SMPS boards. 73

And, in the case of 9V, will waste half of the battery power as heat, 12V wastes 1/3, etc.? OK in some cases, probably not OK if you are carrying the battery to a mountaintop. 73, Don N2VGU

By the way thanks. I’ll follow this document and see if I can’t get the processor to load firmware

Figure I'd update this with a conclusion: The reset procedure sent by Ron worked perfectly but did not resolve the issue. Screen would appear to work normally about half the time and then would error

Same issue here with mine.? Both QMX and QMX +.? ?I believe all setup is in order. Power out is only about 2 watts or so on 20m and 40m. No one responds to me. Put me in the puzzled column.

There’s no current flowing at all from what I can tell. ?Amperage supply never changes

One more question. Please tell us the supply current before pressing the volume encoder, while pressing and after release. 73 Ludwig