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Ahoj! I found a bit clearer description of the SWR bridge winding process in the Norcal powermeter assembly manual, page 10: https://www.norcalqrp.org/files/NorCal_Power_Meter_Rev_1A.pdf You should

I checked continuity and all four connections are OK. So when I look at the schematic the most likely error is 10-turn winding orientation (A-A and D-D). The assembly manual does not specify winding

Here's a description with image of how I installed Zener diodes on my two QDX'es. The minus goes to the Drain and the plus end of the Zener goes to ground.

Hello, my self-built low-band QMX works fine with EFHW antenna on 40 and 20 meters. It usually switches on SWR protection on 80 meters. I measured the actual SWR performance of the antenna at the

Happy New Year everyone from 20 degrees of brilliant Calabria Giuseppe iu8eun

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