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Hi Mac Are you sure there's something wrong with it? In my experience the CW filter on a QCX is very soft compared to my K2 and KX3.? The QMX sounds steeper but still soft compared to a crystal

Greetings all, Due to the fact that the PCB pads for the PA pins on my High-Band QDX are not as sturdy as the rest of the PCB pads (I’ve no idea why) and, indeed, one pad has broken off entirely, I

Hi Charles, There are many reasons for the discrepancy in the SWR measurements.? Since the QRPGuys meter is a kit, there may be differences in construction around the directional coupler.? My unit

Hello Paul, I don’t know. ?ESD maybe? ? I work on a grounded mat but I don’t always wear the arm band. Thanks for the comment, Ken

Hi Peter, I see three possibilities for the input imbalance: 1 - A failed gate in IC5 is pulling the output of IC11 (the Si5351a) down 2 - IC4 is pulling the output of IC11 down 3 - IC11 is

Evan, While I could have used my 20W QRP Labs Dummy Load, since I was also checking the output of the 40m and 20m 50W PAs that I've built, I was using a 50W dummy load that I purchased off of Amazon

Thanks Tony! Grateful to you for pointing out the TN0110! I see discussion also of TN0106, but I suppose there's no reason to prefer that over TN0110 other than price/availability? I received the

I have completed my Mid-Band build and got tested and tweaked.? ?I was targeting 40-15 but it turned out that 60 was a go as well.? ?I'm happy enough with everything but the receive side of 15M.?

Sorry, it is a QCX mini. -KB9HV

Check the voltages on ICs 8 and 9. Look for wrong capacitors or resistors in that area as well (assuming you are talking about a QCX Classic or QCX+). If it's a mini, then all that is pre-soldered SMD

I built a QCX for 20 meters the other day. It went well. I powered it up, aligned it, and immediately made a QSO. It put out 5 watts at 13.8 volts without any adjustment. I’ve noticed that the

Seems like there are a lot of occasions where it turns out that the MPU is fried. I've encountered it what, two or three times? The MPU had to be working to put in the boot loader; what could

Lun, Keep in mind that the noise level and signals on 80 meters tend to be pretty strong. If you had switched in a 15 db attenuator to any good communications receiver you would not notice much of a

Evan and group. I have something intermittent going on here. Sometimes, QDX Digital XCVR shows up in audio and as COM3 in Device manager. But, sometimes one or both will disappear. When either is

If I understand you correctly, you have already fixed the error, that's great, congratulations In the training documents from moltrecht, there are a few probes that can be set up quickly in the

Hello Evan, and thanks for the reply.? Yes, the test I mentioned above was on the main board alone.? There is a direct short from the vdd connection for the 3.3 volt switching supply board to

wb4hio, Have you set up the audio?? I had the same issue until I got the audio set correctly.? Both need to be set up for Hamlib to be happy. 73 Evan AC9TU

Maybe. Does the "Test CAT" work? Can you connect by the terminal? What is the Hamlib error message? 73 Alan G4ZFQ

Hello Ken, I suggest you separate all the boards and measure the resistance on the Vdd line of the main board.? If that is zero, you can do little other than check for shorts.? In my case, it was

Ouch, Evan. Yes that could do it. JZ