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Truly amazing. Jim

I assume you wound T501 with the RWTST 3:2 turns ratio since you are running it at 12 volts. My opinion is you may show your numbers as long as you are within the QMX+ specifications as far as

didn't see the plots but maybe i missed them?

Hi all, A quick comment about twisting the wires for the transformer: The twisting increases the coupling coefficient , k, between the windings. This reduces the leakage inductance (1-k), thereby

A new chat has been created: Can you share your audicity recording from a QMX+ both with and without a signal with me? *By:* NQ5P <rjj100@...> View/Join This Chat (

Correction - Audicity not audaucity

Hi Yoon, Yes, besides erratic behaviors you described, the side tone also sounds funny. Looks like to use reel wire to lower the SWR is the key. I could only get 1.8:1 from MFJ1720 as I

Matti, I was recently working on adjusting the toroid winding for power adjustment when my QMX+ display screen flickered quicky while handling it.? I look to see what may have caused it when I

Karl; There's a longish thread back when the high-band QDX was being built by many, but output power was not as high as many would like. /g/QRPLabs/message/101412 Han's adopted the

You applied pressure to the board. Maybe caused something to short circuit. Even under the board, you had it on the bench unmounted. 73 Alan G4ZFQ

Matti, hard to say without more information. Maybe after getting some results from your tests. 73 Ludwig

I know people post pictures sometimes, but I cannot see them. I vassilate on whether my QMX+ is working correctly or not. I have never received strong CW or FT8 signals, but they are there - but

Hi Gert, Note that a minimum voltage drop is required.? From the specs: * Output adjustable from 1.25V to approximately 3V below the input voltage Three volts below 13.8 is 10.8 volts.? This

Wei, what was the symptom of the RFI problem? Maybe some erratic behaviors of QMX like turning off itself or the keyer suddenly not working, etc.? I do remember having that kind of problems when

Really Weird Twisted Sister Transformer.? This is the 12-volt version of the Wierd Twisted Sister Transformer for 9 volts. This is in the transformer manual

Really Weird Twisted Sisters Transformer [email protected]> wrote:

What does the acronym 'RWTST' mean, or translate into?? Mr Google has not been helpful.

Hi Yoon, I was inspired by your post and tried myself with MFJ1720, the major problem is RFI. Have you seen RFI problem in your handheld setting? I can put battery in my pocket to reduce

/g/QRPLabs/message/139091 Elapsed time 3 days... -- Allison ------------------ Post online only, direct email will go to a bit bucket.

It seems any photos attached to a thread are gone after a couple of weeks? So instead of posting my handheld QMX photos here again, I recommend you to visit my QRZ page to see how I'm operating QMX as