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Got that pin soldered that I left un-soldered after misunderstanding the instructions. Have found a missing part! C509 is not on the board. C510 is and it is a 0603 sizes SMD marked "103." C510 is

Thinning the herd a bit.? Offered for sale is my QRP Labs QCX 40 meter CW transceiver. This is the "classic" model. Firmware is at version 1.08. Transceiver is mounted in a Ba-Ma-Tech aluminum case.

Karl, THIS MIGHT BE IT: *Make sure your QMX is set to VFO A before performing the RF sweeps.* If it's set to VFO B, the RF Sweep doesn't work right and shows graphs like you posted. Yeah, I just had

From my experience swapping them made it worse. I used new capacitors so their values may have been not exactly the same as the originals, but they should have been as they were marked correctly.

Karl, there is one more fix for you to make. Refer to http://qrp-labs.com/qmx/qmxtrouble.html the section *Low 20m output power on early QMX builds* Capacitors C525 and C516 values incorrectly swapped

Dan, When you have IC403 removed, check the voltage at the junction of R401 and R402, in both receive and transmit. It should be 2.5V in both cases. If you have a short at one of the bandswitch

Indeed that sounds like the QMX issue I see. However it does not happen on the QDX, ONLY on the QMX. TRY reverting to firmware 006 and see if it fixes it. If so then you have exactly what I see with

I found the culprit! I had the screw securing the corner power supply board too tight, which caused the body of inductor L101 to contact pin #3 on the LCD board. Backing off on this screw just a

Hello Reiner, Did you use all the values of the low band LP filter 20/30 for HB-QDX?? Were you able to look at the harmonics from this modification?? I did not make any changes to my HB lpf and the

This looks very similar to the issue with FT8CN /g/QRPLabs/topic/100738548#107806

Regardless, do ohm check between drains Q103 and Q104. The easy way to check this is ohm between Gate and Drain on Q103. Good is about 50k ohms. Bad is zero. 73 Karl KI4ZUQ

Same here with linux and FLDigi. Initial? PTT gives a very short burst of power out, then no modulation but keying continues to work. reset QMX and above repeats. 73 Kevin K3TL

I have one high-band QDX and need another one.? I'm looking for a QDX-Labs assembled unit, rev 5, 12 Volt, perfect working condition. Best, Jim K8DDV

I'm away from my QMX for a few days. I wonder if someone could try reverting to firmware 1.0.6 as mentioned here /g/QRPLabs/topic/100771166?p=Created,,,20,2,0,0 The author of that

Wow, the description of failing on the second transmission sounds suspiciously like the FT8CN issue here: /g/QRPLabs/topic/100738548 It is probably the same problem. Sounds like we

Thanks Hans Ive just sent you a ticket describing the fault in more detail...think we must have been typing at the same time. One curious thing Ive just noticed is that when testing the 4 pin

I came here to say zackly this. Easy Peasy and continuity. Todd KE7AJZ --

the red dots give me a short while the blue dots are ok, I don't know what to do. Giuseppe iu8eun Il Ven 18 Ago 2023, 16:15 GIUSEPPE via groups.io <iw8rsb@...> ha scritto:

Hi Jim I should have. I wish I had. But... :-( Anyway I got to your ticket now and my colleagues are handling sending you the missing part, my apologies. 73 Hans

OMG! Sorry Hans - I thought you had an assistant (or two) handling those things for you. OK, QRX’ing - back to using my 20 meter QCX mini for a while. ? -- Jim / K7TXA Eagle, ID SKCC 10447C BUG