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It’s just a PCB finishing error from the factory. There should be a groove cut into the PCB, you just snap it off using even pressure. If there is not a groove then you may have a bigger issue.

Yes, you need at least: C1, R6, R5, Q1, C4, T1, C5, to come with the signal to the LPF. Yes PA B+ connect to +5V. you have W1-W0 and W2-W3 connected instead of a relay. I would in your case try a

Normal receive current at the power supply is 140-150mw. -- Colin Kaminski - K6JTH https://www.qsl.net/k6jth/

I have been testing with a dummy load using a standard SWR/Power meter to determine if I am getting power to the dummy load. ?Is that what you mean? ?I can tell you software is not the issue. ?I

Question: ?The current in receive mode where? ?Where am I measuring current. ?The draw from the power supply? -- Marc N8LO

Building my second QCX and at the point of installing the jacks and the IC11 (instructions 3.48). It seems that the PCB was not trimmed properly and there is 5mm of material on either end that

Hi guys, ... I've read a lot on the list lately about Hans' 50W PA ... but as it is only single band, I ask myself whether anyone of you guys has tried out the chinese multiband PAs for QRP radios,

My very first QDX QSO ( FT8 ) is in the log ! 73, Bill, N4QA ps This is a FINE little rig !

Bojan, I connected W1-W0, W2-W3 and jumper at R3. No power. On page 11, in the Assembly manual,? I see C5 C8 C4 R6 pot Are all these required and also PA + AND 5 volts jumper? Charles Brown

Evan, you are getting this to a very concise set of steps. It is really helpful. What is the transmit current draw expected at the power supply on the QDX? -- Colin Kaminski - K6JTH

Evan, With your observations and suggestions I am quite sure now that my Q5 turned his head away when I was trying to PTT trigger the PA for the first time from an unmodified QDX.? But I have not

Hans, somehow the Moderator Notifications must have been changed for this group. It is not easy to find these settings.??You can check / change these notifications by first going to the main page

If there was a conduction cooled version that would be mounted on a surface :) Stewart/G3YSX >

Will, The maximum current that the 50watt amp input should need would be 7ma.? The current would also go down as the voltage goes down due to a lack of drive capability.? This supports your

Hi Marc, As Dan stated, the first step is to connect to a dummy load and verify that the current in receive mode is less than 140ma.? If not, you will need to remove the 4 BS170 MOSFETS and try

How would I test this on my two amps. I had made the assumption that because I got the same results on two different amps (20m and 40m version), that the issue had to be with the QDX. I do know that

QDX transmitter at N4QA gets its very first reception report via PSKReporter !

Hi all, Just to report: Q5 was a bad guy pushing the PTT line to 2V.? I don't know the reason for the Q5.? I left the 100R parallel to R10 in the QDX in as I think this way the switching is more

I just received an Orange Pi 3 LTS and installed WSJT-X on a Debian image. CAT works fine but the soundcard setup is missing the "alsa_input.usb-QRP_Labs_QDX..." entries for both input and output.

Marc, have you tried putting it on a dummy load and measuring the output from the dummy load using a DVM? The best way to do this is using the terminal applications to transmit, so you can eliminate