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Yes, by time, by changing temperature or after some mechanical pressure. And check please also solder joint from T401 towards IC402 pin 7 for QMX Rev. 1 or pin 9 for later revisions. 73 Ludwig

Also check that it is still set to the correct band version in system settings

The same here. 73 Ludwig

Roger, This behavior could result from a cold solder joint in T507 or its associated circuitry.? Temperature can change its connectivity. Stan

Noted, thanks Tony 73 Hans G0UPL http://qrp-labs.com https://buymeacoffee.com/g0upl [email protected]> wrote:

I found the problem.? I was curious about the output power and turned on the power display.? When the display didn't show power or swr, I started troubleshooting that symptom.? It didn't take me

Nobody else is complaining of the same problem, so, were I in your shoes, I would look for a systemic problem in the way I assembled my QMX+. Several thoughts: 1) perhaps you chronically miscounted

I'm not sure if Hans reads every message so I am posting this with its own heading. I discovered that the SWR sweep test does not actually sweep if the rig is set to use VFO B. Other sweeps seem to

I tried switching back to 1.027 but it still would not sweep during an SWR sweep but then I noticed that the rig was set on VFO B! I switched back to VFO A and it sweeps correctly now! That seems

Thanks for the reply! Could the solder joint have gone bad on its own? As I stated, it was working perfectly fine until about 1-2 weeks ago. I'll test it this evening though

Okay, I am running Firmware 1_01_003 ( https://qrp-labs.com/images/qmx/ssb/firmware/1_01_003.zip ) and have run the calibrations, but haven't started adjusting band settings or attempting any SSB

I can tell it is not sweeping when doing an SWR sweep because the external SWR meter holds steady while connected to my 6BTV. If I do an LPF sweep, the external meter swings all over the place as it

Hi Hector, alle the values are much to low, around -40 dB for the (real) peaks. It looks like a bad connection in the RX path. Please check solder joint of L401 towards IC402 pin9 for QMX Rev. 1 or

I like to participate in the ARRL FMT runs.?So . . . I have investigated frequency response accuracy of my High and Low band QDX's, my HB QMX and my QMX+. Don't have a QCX so can't speak direct to

Hi Pierre. Since you indicated a reference frequency of 25 MHz, Bruce correctly assumes you have the TCXO option installed in which case you shouldn’t need to worry about calibration. If you don’t

Hi! I recently posted about having some bad reception on my qmx after updating the firmware... Well it seems that it is something related to the hardware of my unit. I checked the RF filter sweep and

The JP218 jumper wires are well clear of the SMA connector, in front of it, not underneath at least on the Rev 3 boards. Maybe this was moved on the later PCBs. > > > > Chris, G5CTH

Stan, thank you for such a detailed dissection of this problem! I'll have to try the fix you described, today, at least the fix that doesn't involve a terminal, as I don't have the extra time (or

Radio-related aspect... Heard island is on the tariff list, I was reading this BBC article https://www.bbc.com/news/articles/cly8xlj0485o and thought woaaahh, no humans have visited in over a decade?

0.8 A is to much. To start the controller you need Vdd at around 3 V. This voltage could be produced by IC101 but I guess there is a fault in the chain before. Pleas read QMX QMX_plus Startup (