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Check D109 on plug-in PCB #2, the 3.3 volt regulator.

I built it for 12v and I had the PSU at 10-11v.

How much voltage, EXACTLY were you using to power the radio?

Hello Richard My original aim for the QDX-M was to make versions for 160, 630 and 2200m, which are not suitable for the QDX because of the difficulties with PIN diode switching such low frequencies.

In firmware update mode only the linear 3.3v regulator is being used, there is no 5v rail and the buck converter regulators are not being used. See this article in the wiki for start up

Sounds like the short happened when pressing the encoder. Start looking there. The clearances are incredibly tight in the QMX, and it's a reasonable place to start. Beyond that, I can't begin to

Thanks Jerry, I had a load of 2W 51R SMD resistors so using 4 in a series parallel arrangement gave me 8W power handling. Another way to do the power calculation is Vpk * Vpk / 100, that's

Hello, I completed building the QMX yesterday. The initial plug in went smooth, no smoke no current draw. I booted the QMX into update mode, put the firmware on it no problems at all. Then I removed

It may be irrelevant to your case but something similar on another QRP labs receiver was recently traced to the MS5351 emitting narrow band noise instead ?of a single tone ?carrier on receive LO

I have recently seen unstable 1pps on my QLG2, used for a GPSDO The QLG2 has a minimum of 10 fixes, tracking 17 vehicles and signal strength 35 - 40 on an external mushroom aerial. The 1pps

Hello, I've just joined the forum and was ploughing through the 100+ emails I've received while waiting for my QMX+ to arrive.. Randy I think it might help to explain how this thing is meant to

Richard, The QDX-M has not featured much in this group. I guess it is for more specialised users, the QDM came out soon after and little has been added to the QDX pages. I bought one because the

Thanks Ed for your document. Helping to understand the sun effect on our hobby. 73, Ben

Thanks Ed, John for documents. That’s help me to begin to understand the sun effect. Jean-Jacques, could you re-post as I don’t find your link ? Thanks again for help. 73, Ben

One of my bnc adapters to my dummy load recently failed,? too, and was very flaky.? Not an uncommon problem. For the power output, do LPF scans and see how they are responding.? The efficiency of

Jim: Excellent work and yes, surgery went well but there will be some rehab involved - I’m really sore right now. Right now, I can’t get up the stairs where the shack/bench is located. But,

I rewound T507 and got pretty much the same results, until I checked the BNC connector on my dummy load, and discovered it had been damaged and wasn't giving a consistent connection.? I pulled out my

Hi All, I have a plan to build a QDX-M for 80 metre FSQ activities. The QDX-M appears to be ideal for this with it's clever non SSB method of producing the tones required. However, the web page shop

Stan and Ludwig: 1)? Some conflicting information to clarify/resolve: in one place you say "ADC_3V3 measures 6.6V" and another you say you measure 3.3V at ADC_3V3 (which corresponds with the 6.6V

Thanks for sharing these details, John! How clumsy is it to operate via a phone screen? Workable for a POTA/SOTA event? -Nate N8BTR