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Awesome. Thanks for the response. I ran RF filter sweeps on all of the bands to see if maybe something was wrong with my LPFs (assuming that's what this tests). All part of my still troubleshooting my

Yes, it's actually quite good for 80M. Better than mine. 73, Cliff, AE5ZA

Ronan, I was the guy that posted the limiter circuit back when. Here is a link to it: http://www.nd6t.com/qrp/speaker.htm ( http://www.nd6t.com/qrp/speaker.htm ) No, it does not distort until levels

This is the band sweep of 80M on my QDX. I'm wondering if this is normal:

What do the RF Plots look like? -mike/w1mt

The way I deal with this is to name my supplies with the actual voltages, e.g., +5V, +3.3V, etc. If there are analog and digital supplies at the same voltage, I use +3.3V_A, +3.3V_D. There’s

I saw that. Similar things were tried with the QCX and do work up to a point but they're not a proper solution. I'd rather not have to bodge the hardware when the problem can be sorted out gracefully

OK, thanks! I'll add that to my things to try! :-) Couldn't imagine that those delays should be normal, but it's odd that so much else seems to work! Paul

On QMX, it's been suggested to put a 47v zener from drain to ground on each side of the output transformer, to protect against high SWR over voltage. Wouldn't that also obviate the need for that

I'm not sure would have to check, but with 12v I'm getting between 3 and 4 Watts input on each band when connected to an aerial.

That, I don't know...

I'll try that!

I backed everything down to 80%, but nothing changed.

Hey, Charles. I'll try adjusting the power.

Thanks, Evan. I rebooted my machine, but still no change.

Just FYI.? I had a problem with my QDX being overdriven with the audio input.? It displayed similar behavior.? The transmit light would flash once and the power output was erratic.? I can tell

What is you transmit power into a dummy load for each band? -mike/w1mt

Ensure that you have 2.5v at each solder joint for T401. -mike/w1mt

Wayne, Be sure to power cycle the QDX between settings changes.? It may be that the settings do not take effect until power cycle and or reboot. 73 Evan AC9TU

yep, that's what I'm getting. attached is audio scan, looks bad. Paul DJ0CU