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Hi there, I've run some tests now. Measured the output power with almost 5W at input voltage of about 9.1V into a dummy load. I tested for continuity on all the coils. The soldering here seems to work

Or even better, 63/37 (eutectic) alloy with RMA flux core. 73, Don N2VGU

It could be a faulty USB cable, but I would check your antenna from end to end and the transmission line first. I was having some strange issues recently and discovered my counterpoise had fallen into

The setup of this combination has been working just fine with FT8 and WSPR for a while. All of a sudden, tx stopped working while rx still works, including bandhopping. After resetting and restarting

I would not agree to the statement that it won't work with lead free solder. You should use a soldering station anyhow for the multilayer boards and with a good alloy there is no problem. I'm using

The water spec is common for what's also referred to as deionized water in industrial applications. We had a plant at pppl.gov that made thousands of gallons, since we used it to cool a number of? of

Has this been fixed or are these the same modes that work? Is there a way to do RTTY?

Hint for *ne* *w* builders: If you? build with lead free solder your radio will probably not work. Maybe if you? have a lot of experience and? very nice equipment you could make lead free

If anyone is building more than 1 and is willing to sell the other one, I'd love to volunteer! Interested in the full monty — the board with ATU, battery, and speaker. 73, Merry Christmas, Randy

Now then Dave, a chance for you to write a scholarly article about this and submit it to The Lancet or such. As a doc, you have the qualifications. Maybe they'll publish it and it can become known as

Happy Holidays to all and may 2025 be happy and prosperous to all.

As Greg says the QRP Labs 10 Watt amplifier is not suitable without modifications to reduce its gain. Basically that is best done by removing most of its circuitry. (Or the QMX PA.) And, following

How do I sign up for this group buy? I? will commit to this buy Will

Merry Christmas, Roland, I went back and read your first post.? ?We may be looking in the wrong area.? The incorrect voltages on L10 suggest that there is a problem with the T/R switching

Thank you to everyone in the group!! And hope you all have a merry christmas!! I just realized that farther back in this thread, I said that I would submit audio and RF sweeps and I still have not

I believe the 10 watt kit requires a very low input power level.? I've had good results with the 50 Watt Amp kits for 15 and 20 meters, powered at 12 volts,? with the bias set to produce only about

I've assembled, successfully, a QMX HB, a QDX LB, 2 QMX+ units, three 50W amps, numerous, small SWR/Power Meters, 2 QRPOmeters, an Elecraft dummy load and a slew of plugs, jacks, and RC aircraft

Depending on band conditions, a few db of gain can make a difference.? I am looking at the 10 watt amplifier kit. I'm wondering if I might be able to use the case of the QMX+ as a heat sink.? But

Merry Christmas, and Happy Holidays to all from Upstate New York, USA. May your Holidays be filled with peace and love, family, and ham radio friends from afar. -- 73, Dan - W2DLC

As many more have said: NO!? The real difference between 3w and 5w is virtually indiscernible.? FAR MORE depends on your antenna, the propagation characteristics of any particular day, and the