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Hello Paul, did you use a probe 10:1? If yes did you configure the oscilloscope for 10:1? Did you use AC coupling or DC coupling? And which picture for which test point? 73 Ludwig

Brian, you may read QMX QMX_plus Startup ( /g/QRPLabs/wiki/36878 ) to find information how to debug the switch on process. 73 Ludwig

Ludwig, Thanks. I normally use a small buck converter between my station supply and my radio.? However, for testing I used my bench lab supply, a KORAD 3005D set a 9v, to exclude the buck

Good afternoon Thanks for the help so far. The results of the probe with a scope are here. https://www.flickr.com/photos/202049058@N06/albums/72177720323338359/ Cheers Paul m0pnn

Stan, thanks so much gathering up all the information making it more user friendly. I've pretty much completed my ATU build and encountered most of the clearance issues mentioned.? I actually put so

Brian, good to know. While QMX is off one pin at only one of the power boards should show the supply voltage and all the other 0 V. When pressing the left encoder this voltage must stay (nearly)

My U3S has found a new home - thanks to those who expressed interest. It really is a well done product - months after the initial build, I still can't get over how much functionality is packed into a

Seems like an almost perfect use case for Bittorrent file distribution. Justin N2TOH

Be careful. If you select e.g. 40m band and dial frequency on 20m band, you still have active BPF and LPF for 40m band and you can damage finals. 73, Zrinko Ivan, 9A7AM

Hi Gary, Before you do that I had a similar problem with a new u3s I was building for someone resetting itself,? traced to a faulty cap on the 7805 output. Try it without any caps on output

Ah great Conard !!!! Thanks !

Hi Gert, I haven't tried above 10M, but mine tunes the whole HF spectrum and does a great job of it. 73, Conard, WS4S ________________________________ Sent: Sunday, January 26, 2025 1:28 AM To:

In the "QMX operating manual; firmware 1_00_026" page 52, there's a reference to the "RX outside band" setting. It say's that: When the setting (RX outside band) is ON, or when the “Band limits”

Thank you, all. Jeff, EMRFD looks close to what I need. Seems it is out of print, but already found a PDF. The book by analog.com is also promising. Hans Summer's explanations are too terse for me

I know that having searched this group there are several threads about QDX and Fldigi but I do not succeed to set all up my station and have it working well. My computer is under Windows11 and my QDX

Ed, FYI I tried this morning, but couldn't hear your signal in Utah, even though I saw a Utah station spotted you. The band was very quiet here. [email protected]> wrote:

My U3S story: ?It ran well for about 2 weeks, WSPRing on 10 meters, GPS controlled. ?It is a very clever design. Today I noticed it was resetting itself once in a while, so I found a problem with

Ludwig, Thanks for the reply.? ?I had taken it apart to check other possible causes. I found that when pushing the left knob down to start one of the connections on the power supplies went from 9V

Hi Wolfgang can you repost the picture of your meter? Ed de: N7SNT

My sister and me ! -- 72, Bill, N4QA/QRP