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Sorry, I sent this before reading the earlier message saying much the same…

Could it be ESD perhaps? I always use a static grounding wrist strap.

The TN0106 is the 60V version of TN0110. It would also work well but you’d want to install a snubber diode for protection against the higher kick. Both devices will produce a higher kick

Peter, It is an indication that the waveform is at half the 3.3-volt supply.? It could be a constant voltage or any waveform that has 1.65 volts on average.? The only way to be sure is to verify a

It definitely looks like the regulator? went out. there is a bulge on the input side. As Bruce noted I am lucky the ground didn't burn as that probably would have sent? supply voltage to my brand

Agree with GM0EUL, it is an analog filter with skirts (IIRC) of ?-12 dB/octave, so a signal 350 Hz higher or lower would be only 12db quieter, and therefore adjacent strong signals will still be very

Thanks Evan! I really appreciate everyone's willingness to help me despite my non-standard setup. If it is #1, I hope that isn't likely to lead to #3 the more I run it in this state. I'll try to get

Well, today I was getting started with the build and discovered that I also have the Q103 short. I don't have a heat gun, so I'll try removing it, cleaning up a bit and reinstall the Q103 as you

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