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Tried it without the GPS and got no spots. Otherwise just followed instructions in the manual. Got the amp in the workshop ready to build. John KY4WW ________________________________ Sent: Tuesday,

Sweet! I have got to set mine up for wspr. Was there any issues you encountered in your setting it up? I have the QCX+ in 40 and 20. Careful, once you build one, you will want to build another. The

Just finished my QCX+ 40 meter and decided to set up the WSPR beacon. Used the QLG2 GPS receiver to keep time. Using an EFHW tuned for 40 meters and a 3 cell Liion pack. Wattmeter shows a bit under 3

I don’t use those. I do fave a fan though and it keeps the fumes away from me. The room is large. Closed in garage. Sorry I don’t have a recommendation but there are plenty of them out there.

If you build in your home or enclosed space, do you use a smoke/fume "eater"? If so, any recommendations? -- Wayne S. KF7RCM

I have a Pi3 that has a "ham OS" on it.? Lots already set up, it was how I got JS8call to work.? I cannot find an .iso or other image to set up a 64 bit OS for a Pi 5.? If anyone knows of one,

Thanks for the feedback.? I understand a MOSFET will increase in resistance as it heats up and many QRP rigs don't compensate for that.? My SW-3B also has a MOSFET final, but its power output drift

Thank you for sharing this great work!

Wow! I didn't think there was any space left over in a QMX

Mike, You were correct, a factory reset did the trick! ?Now I will install PuTTY and play around with all the diagnostics. ?Thank you! Derek WF4I

hi Hans, What is overlooked and interesting is that just amplitude modulating the amplifier creates sidebands that are related to the rate of modulation. So when you have AM at 1khz the sidebands are

This goes to a question I've been meaning to ask, for the BS170s in the PA, is there any reason (providing there is room) why one could not use transistor clip on heat sinks? I tried something similar

Follow up, going ahead and ordering a QMX kit tomorrow. Thanks for all the input. -- Wayne S. KF7RCM

Actually the small QMX also has some room for the mod, although the speaker has to be very small to fit in the room. 73, Yoon KM6KJI

A slight decrease in output power in extended operation is normal for any rig that uses MOSFET finals. Their resistance increases with temperature, reducing the gain of the final stage. That makes

Some additional information: On the QMX on 30m where I measure the drift down in power from 5.2W to 4.8W, the initial current draw is 1.16 Amps.? On 20m, where I don't observe this level of drift,

Hi, I notice a downward drift in measured power output and wanted to know if it is typical.? I am using a QRPguys 12W dummy load with diode rectifier and capacitor envelope follower, plus a DVM. For

I encountered the same issue with my high-band QMX and thought I had broken something.? I found the answer in the manual.? You need to do a factory reset, and after factory reset, you will

QMX PLUS.... The bigger one. Small QMX has no room for this.

Could be something around the processor, like maybe a little solder ball shorting a couple of pins. Try cleaning with a soft brush and inspecting the board closely with a loupe or magnifying lenses.