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QMX+ Rev 3, Firmware 1-00-027. Connected to 18 V lithium battery / 12 V linear regulator. Takes no current. The voltage between ground and the back of the DC input socket is 12.15 V -- 73 Matti

Hi all, Next monday,?February 24 is the next *QCX Challenge* , on the regular bands. Times are 1300Z, 1900Z and 0300Z (Tuesday). Time to get on the air with your *QCX, QDX or QMX* rigs! Use any

Wes Hayward was not the norm (and still isn't). Check the station photos toward the back of that 52 yr old QST, all appliance gear. Lots of Heathkits, though that's hardly building your own. You

Great stuff Jerry, and good to take a look back when building was the norm! Just a word on the touch keyer. I built it, because touch is what I had in the old times. With the QCX I found it to be

Go down 7 photos here, Wes working his Micro-mountaineer is the small black and white photo to the right: https://w7zoi.net/mtnradio/port67.html His QST article describing the Micro-mountaineer

Many years ago W7ZOI is pictured with a handheld cw rig. Key is attached, maybe battery in his pocket and a wire antenna is deployed into a tree. Certainly qmx can do this with a suitable key. I may

I asked to QRPkits and they answered: - this kit is basically a filtered and regulated power supply without the transformer. Input voltage up to DC or AC 20V. Output voltage from 1.25V minimum to

If the filters are in the default setting and the sidetone frequency and cw offset are the same, even a tone-deaf op like me can match the other station without actually zero-beating a generated tone.

What firmware revision did you have when the rig failed like that? What hardware revision? Latest firmware rev is 1-00-027, and seems to have reduced the occurrence of this sort of thing

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