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I'd assume the clunk is due to poor voltage regulation. Check power supply voltage with key up, and then with key down. Another way to reduce the clunk is to increase the size of C430 by a factor of

Thanks for the help. Sorry for not being clear, I am using a par and fed 20 m and fed halfway antenna with an inline RF choke. I shall experiment later this evening from my home QTH where I have a

I can't speak for the QMX as I haven't built one yet, but with previous designs the washer is not intended to be a heatsink. It's purpose is to hold the finals down flush with the copper pad on the

A note about fanless heatsinks… these are better referred to as heat spreaders or heat delay devices because they slow down heat buildup by spreading it over a large surface area. Finned heatsinks

Morning all. I recently received my QMX (hi bands) and I’m very impressed. I have a QCX Mini on 40m which is a fine radio but the QMX feels more smooth somehow; probably psychosomatic! Anyway, with

Please add me to the list!

Hi, i had the same clunk and I fixed it with a better power supply. It didn’t provide enough juice during transmit. With the better power supply I have no problems whatsoever ? I don’t know

My QMX+ hasn’t arrived yet so I can’t check this out myself. Step 2.23 of the assembly manual shows installing the font panel plate at the beginning. This results in a narrow gap for soldering the

Possible RF issues? Everything always works great within the RF choked and optimized space of my shack, it's always outdoors with a temporary antenna and ground (or no good ground) that I start seeing

Hi Mark I cannot comment on your other issues, but the T's are normal, just the CW decoder trying to make sense of random noise. 73 Roger 8P6RX ?Get BlueMail for Android ?

Outstanding Jim ! After your tests, I’ll set up to do the same. Keep us posted ! 73, Jamie WB4YDL

Brand new, worked perfectly in the shack on Monday. Took it to a local park with a freshly charged 9 B Bioenno battery (it's a 9v build). 1. No audio out 2. No sidetone 3. A bunch of letter

I wonder why I can't see the pictures posted in this thread. I read content online like a forum, rather than getting emails, perhaps that is related? Still, I normally DO see photos posted here and in

Could use a usb hub. If that's an option it's probably the best way. But in my setup I'm not. Instead I plug in the gps and let the time fully sync first, then when that's happened I unplug it and

I connected my QMX to a 20 meter QCX 50 watt amp and the result is failed QMX transmit (no power). My QCX does OK with this amp but the QMX took a permanent dive for some reason. Receive is fine, but

Nico, to transmit you use the TX path and for receive the RX path. If one is ok it doesn't mean the other must be ok also. 73 Ludwig

Is there any reason my qmx can transmit 4 watts on 10 m but it can't even pick up FT8 [email protected]> wrote:

I was thinking the the benefit of the QCX 50W over the WA3TFS was the use of PIN diode switching,? I need to double check the design. Fortunately I do have test capability.

The pointer supplied was for that amp! So I repeat. /g/QRPLabs/files/KB1GMX-files/HF_use_FET_1.pdf -- Allison ------------------ Post online only, direct email will go to a bit

Allison Thanks for your response. I see you/Hans included negative feedback on the QRP Labs 10W amplifier,? but WA3TFS does not.? I also have a MX-P50? that has negative feedback. So I may have to