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Encouraged by the results of the [80m/60m] filter I implemented my [40m/30m] filter to go with it. The attached VNA sweeps include the LPF both diode switches and the coupler. I was about to measure

Basic question but did you load firmware? -mike/w1mt

Ryuji, A variable capacitor connected onto the capacitor bank of the ATU would be sufficient. Otherwise, how would you know if you have picked the "toughest" load? Gary W9TD

I dont have test equipmemt, just a digital volt meter.

Thanks John, Well, the gate had 6.5V on it. The Source and Drain had 11V. Wasn't sure whether that was 6.5 was high or low. Low I was expecting to be 0V. I lifted the Gate pin and now the pad for the

Hi Keith, Since both transmit and receive have issues, it would point to a common component failure.? These would be the circuits from the BNC to Q508.? I would start with verifying the BNC

Of course. A PTC resettable fuse in a SMD chip placed right next to the final amp would probably be a good idea anyway, if there's a good way to squeeze it in.

Hi Rob I have a spreadsheet here but there is no published list. 73 Hans G0UPL http://qrp-labs.com https://buymeacoffee.com/g0upl

I am a bit reluctant to ask this question, because I would think that it has already been taken care of, but I am not able to find it. QMX is currently at firmware 1_00_009. There are still issues and

Ryujil, A fuse or current limited source should protect that situation. 73 Evan AC9TU

I had to get a smaller iron for the QMX: https://www.amazon.com/gp/product/B09DSDBC7G/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&psc=1 Hans, you are right about the stripes! But I checked every part

I just finished up my QMX assembly. The radio power up properly but It does not receive any signals and does not transmit. I am only getting white noise in my earphones. Any suggestions about where I

Thanks again - I'll only guestimate from similar spec'ed zeners then. Zeners of course have much larger capacitance when the reverse voltage is near zero, but that's when the transistor is

Please email brooklynqrp[at]gmail.com if interested in operating the Brooklyn QRP Doghouse Operation Sprint 2023. Click INFORMATION in first post here: https://brooklynqrp[dot]blogspot[dot]com Here

Hi Stewart It does appear that wsprnet thinks your call is in a M6 location Perhaps because your wsjtx is showing an M6 go to settings in your wsjtx and change it to an M4 nearby like an M4 of KG32

Ryuji, I can not answer your question.? I am using a standard model for a?1N5369B 56-volt Zener.? That is not what I used to modify my QDX.? That was a 1n4756a a 47-volt device.? I do not have a

Awesome, thank you Evan. When you run simulation with Zeners, how much capacitance does your Zener model put on the circuit? (obviously, this is voltage-dependent)

Hi Stewart It does appear that your telemetry is being transmitted on minute 8 Dave VE3KCL 2023-09-17 19:58 0Y6TVK 14.097033 -10 0 NO64 0.01 ZR6N KG34 10886 236 W-2 2023-09-17 19:48 0Y6TVJ 14.097145

Ryuji, The advantage of simulation is that it is easy to do what-if analysis.? Here are the results you requested: RL14p=OPEN PW=3.75 watts VDp=202 volts RL14p=100 ohms PW=3.6 watts VDp=39

Your point of limitation coming from quantization is correct in theory, but the limitation is a non-issue for the question of simulating a tough load to the FET. No practical continuous variable