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Hi Ryan Since the upgrade to firmware 16, I can no longer tune lower than 20 meters I don't think QMX is capable of doing this by itself, not as far as I know. The firmware upgrade would have done a

Hello, Since the upgrade to firmware 16, I can no longer tune lower than 20 meters to listen, QMX reverts to 14.074 regardless if CAT control or stand alone. I was using HDSDR to listen to other 30

Hi Yannig, the cleaning of the contacts as suggested by Adrian seems to have kind solved the problem on practice mode. I will add a counterpoise in my next activation and see how it behaves. Probably

Hi Adrian, thanks for your suggestion. Actually when I came back from work I tried the key on Practice mode and there was some malfunctioning. So I cleaned the contacts with sandpaper and immediately

Hello Colin The BPF is a series resonant LC circuit, and a 1:4 multiplexer selects one coil tap of the inductor, and one capacitor. There are a lot of parasitic elements present in the circuit,

I was in your shoes a few weeks ago. I've never done hot air work before so ordered a Yihua rework station and a few IC402 replacements as well and went to town. I started on a pretty low heat setting

Hans, I love reading your updates and circuit theory. I was wondering if you had an update to the cause of the V1 receiver change? I still find it amazing that the QDX and the QMX V1 receiver filters

Hello Dave Sorry for the lack of clarity. There are 1,000 PCBs arriving here in 2-3 days which cleared customs today. They are all Rev 3. So all pending kit orders will be shipped Rev 3 boards. 73

Thanks for the info Hans! So is the shipment of V2 boards you are waiting for going to ship as V3?? Or is V3 still in fab? Dave

I have removed a few IC402's just hot air and tweezers.? I do use some aluminum flashing to screen off local components from the hot air. When replacing, I think it was Hans, recommended using Blue

So I have a replacement on the way (several, actually, just in case), along with some diodes for the Q508 related fix for the QMX. I have a hot-air rework tool, and have some finer tips on order for

I have confirmed that my issue is indeed IC402. I applied the diagnostic fix that was posted by Chris

And P.S. There is NO reason to try to change to a Rev 3 board... no change in functionality! 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl

Hello Dave Rev 3 is not here yet. The cargo cleared customs today in Izmir so I expect the last 250km by road to take 2-3 days. The changes from Rev 2 -> Rev 3 are minor, as follows: *1. Moved L402

Okay, fair enough, I don’t have a QDX or the amp. There must be a difference with them in the position of the power socket relative to the panel and then the panel hole size matters. 73, Rowan.

Yes. A piece of the toroid magnet wire with enamel removed from both ends is what I meant. Should work fine. Good luck…Ron

Alan Wolke has a number of excellent videos on scope basics: https://youtube.com/@w2aew I don't see a playlist just for scope basics, but the video titles are useful and informative.

I ordered a QMX V2 kit in late January knowing it was delayed until early Feb, but when I was on the website checking my order, I see there is now a V3 of the QMX. Anyone know what the V3 changes

Thank's, 12v,power supply 13.8v, 1 ampere in tx, I read power with terminal prog of qmx and meter of display on qmx, John.

Insufficient data. Voltage built for (9 or 12)?? Actual voltage used for measurements?? Current consumption?? How did you measure/calculate power? 73, Don N2VGU