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- ..- -.. .? -.-. .... .-. .. ... -- .-? ..- ... .- -- Chris / W2BPL

The QMX is much more complex than the truSDX. There are many more components and the boards are much tighter. There are more complex windings to do as well. However, if you have done a nice neat job

SOLVED After I fixed SWR bridge transformer, output has changed (and increased) on all bands. With a fully charged Li-Pol battery and dummy load: 80 meters: 6 W out 60 meters: 6.5 W out 40 meters: 5 W

I don't see how there can be any confusion.? Each end of the 10 turn winding has a wire that comes out of each end of the toroid and there is a hole for the 10 turn winding next to it. The obvious

P.S. now I realized that in Power/SWR display the TOP bar is power and the BOTTOM bar is SWR (BTW I think this is not explained in Operation manual). With my SWR transformer screwed the top bar was

Hello, Adrian, thanks for the link! I checked the windings. They look the same as in NorCal power SWR meter as well as the photo in assembly manual. So then the only other possibility was that one end

Jim, Thanks for your advice. I decide to leave it there for now. I might try the adding capacitor method when I feel it's necessary. 73 de Lun BD8BTE

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