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OK.? This is something that I did not understand.? I assumed that the /LIN_REG_EN (I always? use / to indicate an active-low signal) was turned on during the startup test and then turned back off

Bear with me please as I am still learning, but I believe the LPF for 40m must be good for 2 reasons.? 1 - transmit is 5w on 40m? and 2- the lpf sweep looks good. By swapping, do you mean in the

It seems I can not find the raspberry pi note in the manual on bookworm, but I encountered an issue where the /TTYAM0? USB port changed to /serial0...I read that they changed the path names and some

I tried but the fingers would not get past the ridge.? The other battery I have did not have the ridge.? It was the way the battery was manufactured.? But thanks for the reply.? That's fixed now

That is a BSS123 n channel mosfet. ?The gate should be switching to about 3.3v on RX mode and GND on tx mode. ?The drain should stay at GND regardless of mode. ?The source should be at GND on RX

The wiki page QMX QMX_plus Startup ( /g/QRPLabs/wiki/36878/207188 ) has been updated by w8gu@.... *Reason:* Based on discussions with Chris and Ludwig Compare Revisions (

Hi everybody. I had recently blown two BS170 in my QMX+. Fortunately, a friend gave me his from a spare qmx with CPU failure. Anyway, I decided to buy some other mosfets... just in case... You know...

In addition, the "QMX PSU test process.txt" document that is referred to in the " QMX QMX_plus internal power supply" wiki should be changed.? It says: PCB #2 1 ?Connect a 5.6V, 100mA max power

Once again, I can’t say enough good things about Jeff Moore. His work is outstanding and his knowledge of the products far surpasses passes that of us mere mortals. He is timely and his fees are

So, based on responses from Ludwig and Chris, I am hearing that the wiki "QMX_QMX_plus_Startup" is incorrect.? It appears that this is a true wiki, and I can edit it. Would anyone be upset if I made

Thanks for the helpful replies Ronald and Daniel. I can go ahead now, and get winding! 73's -- David Thomas M0OOR

Hello all, it was reported Sidetone set to Relative could be better than Absolute. 73, Ludwig

Bruce, do you still have key click issues on 40 meters when feeding a dummy load? If they go away with a dummy, you may have a problem with RF getting into the rig which could be mitigated with a

Greg, it looks like an increasing load to IC503 produced by the PA. The higher load may affect also the load to IC501 and IC502. Could you show the waveforms at G and D of each group of BS170 (with

Mark, I think Chris is right. So VDD = 3.01V is consistent and enough to run the controller. I think, you are also right calculating this factor. But the calculated Duty max don't fit to 8.1 V shown

Varac is using the VARA protocol. This does not work well with QMX as it is shifted-tone, and thus based on SSB. SSB is not yet enabled on QMX - requires a new firmware version that many are waiting

Typically the processor will use Vdd as the reference for the ADC so if that's not 3.3V all the other voltages will be reported incorrectly.? Some processors have an internal voltage reference and it

Yes very possibly. I should note for completeness this is on my QMX+

I think that Vdd being low when running on the linear is a feature of the linear circuit. The ground of IC1 is connected to ground through the diode D102 and this lifts the output by the diode drop

Is it possible to have here the list of digimodes you've tested successfully with your QMX and with which piece of software ? On my side, for now : - JS8call - FT8 with WSJT-X - WSPR with