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At the end of November I received my new prebuilt QMX DOA. After following some troubleshooting tips from members of this group and reaching out to QRP Labs support with no luck I finally sent the

Which variant did you order?? The price varies a lot. The only difference appears to be the lead finish. 73, Mike KK7ER

Chris and Adam: I have tried every test suggested by Chris.? There is continuity between the wiper of R5 and the gates of Q1 and Q2.? There is continuity between V+ and the drains of Q1 and Q2.?

To determine the jack size, search messages for drill bit sizes. Someone in group gave a simple way to determine using drill bit. [email protected]> wrote:

You can use the shank of a 2.5mm drill bit (or 3/32" in US). If it fits in the plug, it is a 2.5mm plug. If it doesn't fit, it is the correct 2.1mm plug.

For those of you who are building the ABS (ATU, Battery, Speaker) for QMX+, designed by Sardar AC8L: This is a new topic to capture your build notes and information that may be helpful to

Pierre, The QCX does I/Q processing in hardware using caps and resistors and op amps. On the QMX this is done digitally inside the STM32F processor. I doubt microphonics on caps used in the transmit

Actually a very good question, it's hard to tell by eye. You can measure the outside diameter of the plug barrel to verify it is 5.5mm with a micrometer, but all other measurements are difficult. I

Hans, I remember that a few years ago, when you developped the QCX Mini you started with smd caps then had to move more and more to throught-hole caps due to microphonic vibes. Does this current move

This may be a stupid question but how can you tell by looking at the plug if it is a 2.5 or 2.1mm plug? Having read this discussion I thought it prudent to make sure the plug I am using is the right

It is for the power supply that is part of the ATU board.? But we no longer use that power supply, since we can get 5V from the QMX+, so we don't populate any of those components (which saved some $

Hi Stan. Thanks for the great photos! I have a question. Is the blue heat sink next to the PIC, is that from a previous experiment as well? Thanks! -- 73, Rick VE7TK Website: https://www.ve7tk.ca/

Thanks for the tip Don, I shall take your advice. 73 Nick G0OQK

Hi Larry, Michael, all QMX and QMX+ have significantly different assembly procedures and have always each had their own assembly manual. The operating manual is common to both QMX and QMX+. The PCB

Found the answer to my question: https://discussions.apple.com/thread/255238864?sortBy=rank.? Working now.

Yup, I'd seen the Ruiwaer parts previously but haven't ordered any. Good to know they work well. Additional discussion here: /g/QRPLabs/message/132397 Jerry,? ?KE7ER

I'd suggest that you get some 1ml syringes with caps and some "Luer to Luer" couplers and portion the contents into the 1ml syringes for use.? This way the stock syringe will be opened less,

I can vouch for locking screw-ons of 2.5 mm jacks and plugs. Switchcraft jacks are not TOO pricey but lordy their plugs cost a bunch. Found some decent 4 pack screw together 2.5mm jack/plug combos

FB? Remarkable what a few watts,? a superb transceiver and some genius software work can do! Thank you Hans.?And the many other enthusiastic amateurs' broad shoulders. :)? GREG KI4NVX? Yahoo

I dig the SWR+, is that a kit?