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Hi all, I am building a mid-band Rev 4 QMX. After installing the L502 toroid, I checked some connections using a continuity tester and noticed that all leads connected to L405a and L405b are connected

Depending upon the core size and type, yeah, heating at 5w is a thing. Especially w/ EFHW antennas. Al, K2ZN

It does sound like maybe some mechanical flexing in the PCB could of shorted something out to the chassis. I would suggest pulling the board out of the case and looking at it from the side to see if

Then we're back to: is there any way the transformer could be overheating. It seems unlikely, but so far, it's the only thing I've personally seen in the wild that leads to the specific symptoms you

That was a typo. It is a proper 49:1 UnUn.

Now I remember, I was hoping to use this to provide 20 volts for the qrp labs 50 watt amp from a 12 volt battery. Do you guys think it will work ? Paul K2DB wrote:

Hi Paul Google image search https://www.aliexpress.com/item/32826674801.html 73 DE muhsin TA1MHS

I ran tests with fiber washer/nylon screw and also with metal washer/metal screw. I also ran the TN0110. Some experimental noise is evident I think but it is too big of a pain to redo everything.

Apparently, I'm learning to understand what I see when I just see a board like that. I'd made a bet with myself that it was a boost or buck/boost. Michael WD0OM

stick 'A1401220' in google, and it will show you they are 250w 10A 8.5-48v DC-DC boost converters ;-) 73, Graham, 2E0WRW <paul.mackanos@...> wrote:

All you need are USB A to C cable and an Iphone camera adapter. Works well with my QMX (not plus). Also have used it with a trusdx, USB audio adapter and iphone camera adapter and also?a

I cannot remember when I purchased these or why I purchased these and I don't remember what purpose I purchased these.Can anybody help me out?I have two of them. PAUL K2DB

I did actually take the QMX apart after I posted, as much out of curiosity as anything else -- I am building a QMX+, but had not actually looked inside the QMX since I bought it used, already built.

Yeah, I realized that after I'd posted, then felt dumb about it. I did take a moment to zero them out. It did not really change the output result, of course.

Roy: I did in fact post that it was a 12V QMX. I did not build it, however; I bought it from someone else who had. I have to admit I had forgotten to pay attention to what the power source (an Anker

Thanks for the reference, Alan! Eric

Please see the 开云体育 "loop Antennas" page... /g/loopantennas/topic/w2li_magnetic_loop_operating/22078504 Best OM, NZ8I

It's a 1-time $1.99. And what virtual USB port are you talking about? The app gives 3 choices #1 Hold the? phone up to the radio (yuck!)#2 Build a custom cable to hook up audio to your headset jack#3

I have a homebrew magnetic loop with a 10 foot coax outer loop that tunes 30m - 15m. I always (or at least usually) tune it with a nanoVNA before connecting my radio.? That way I can make sure the

Hi Luis - I've used iFTX with my QMX using a USB-C to USB-C cable. Haven't made a video on it yet, but it works like a champ. Just requires setting a few threshold values correctly for Vox. Worth the