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Alex, The loose winding would not have a significant impact on the output power. What is the QDX current draw when receiving?? ?I believe that the rev 5 receive current is around 150 ma.? If it

With a QMX about 4 months old I was happily working FT8 on 20M and all of a sudden the waterfall stopped showing any signals, only normal noise. Transmit is fine with normal power out. Verified: -

Fresh set of problems...tested each MOSFET and they're operational, theoretically. When I got ready to test the drive of each during transmit, properly rigged to a 50 ohm dummy load, external power

In Class E on 20m I get 4 watts. It’s not that hard 73 Barb WB2CBA

Not practical, at least. Since the C is so large, the reactance is so small. In order to tune it out, the inductance needed is also very small. That leads to a very critical high-Q parallel resonance

Ladies and Gents, I have a question so simple, I am almost ashamed to ask it: would it be possible, for a class E amplifier to compensate the gate capacity of the transistor used? w L = 1/(w C) Do

Squeeze the turns of L513 together as close as you can -Mike/w1mt

I would check the receiver BPF sweep under the hardware diagnostics menu. While it is about the receiver, it measures through the transmit LPF so there may be some clue in that plot.

My problem is low power on transmit, only on 20 meters. I bought the kit in Dayton, built it right away and had good output on all but 20 meters. I set the kit aside and today, I applied all of the

Hi, Hans. I want to buy two cases like the ones you use for the Clock Kit (~162mm x 123mm x 44mm) but with no markings, holes or cutouts. Can you tell me a source for these? Or can I buy them from

Indeed. However, I hope you now see that the complexity from the TX LPF side is much worse!

Just found a scope about 1/2 an hour away. If I could get a list of points to check maybe I could find something helpful. Not sure what I'd use for a signal to trace though. 73, Cliff, AE5ZA

Yes Ryuji, I agree completely. The only complaining factor is that the series LC BPF has to deal with that complexity! JZ wrote:

Rich, I hope these are what you wanted. 73, Cliff, AE5ZA

Rich, Washer (actually aluminum piece) off? 73, Cliff, AE5ZA

JZ, I did not study your previous discussion on this topic, but I think the frequency-dependent input impedance of the multiplexer-based quadrature mixer circuit to be a positive asset rather than a

Hi Cliff, Sorry, I should have specified.? Component-side please, and by that I mean the side where the BS170 transistors, the two power supply boards, the toroids, etc. are visible.? I'd like to

Hans and JZ, I interpreted the mixer behavior in the context of real life situation where the LO and RX freq are fixed. We have a target signal at the RX freq, and unwanted interference at a certain

Greetings Hans! Yes, the Tayloe circuit is amazing and very robust! It will tolerate all kinds of misapplication and still provides a virtuous performance! That its BPF response and Zin response

Hi JZ, Thanks for bringing it up. The quadrature mixer side is probably not innocent. Maybe it's not a bad idea to remove the primary hot side of T401 and stick it into NanoVNA to measure. That