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I noticed when doing the mic leveling that I got louder peaks when I wasn't pressing the PTT button on the external mic, but the actual output when transmitting is based on the levels when pressing

Hi I modified my QDXs so they can work with 5 Volts from the USB of PC, tablet or phone. With FT8CN now I can run a minimum system from my phone/tablet Power is about less then a watt, so you can call

Summary: When there’s a solar flare.. go mow the lawn.

It's not a model per se, but did you notice the "Enclosure engineering drawings" on the info page about the QMX+ (https://qrp-labs.com/qmxp.html)? I would imagine they would give you the information

Oh, my. Then you're going to spending time on the main board. Lots of places to look. I'm sorry. Something easy - just unsolder the finals. After that, if the short is still there, it's a matter of

The 12v short is without the boards installed.

Wow, that's not good. And if you unplug each power supply one at a time? Need to find out which one is blown. They both have the +12vdc going to them.

Hi Everyone Thanks for all you advise and comments on my low power issue on my newly built QCX+ for 60 mtrs. After a lot of time playing around with the LPF I decided to restore all the toroid values

Hi all, Having real struggles to find an existing cover(s) for the QMX+. All the ones are see are for the QMX. I can model some up easy enough but looking for a 3D model of a the QMX+ itself to model

Started following this WIKI /g/QRPLabs/wiki/37128 /g/QRPLabs/files/QMX%20PSU%20pinout/QMX%20Pinout%20Drawing.pdf And when I did the following: 1) Checking all pins

Lift one side of it. If the rig powers up, that's your problem. It's an easy check, but make SURE your voltage is under 12 volts in. If your supply surges, it will blow the 3.3 volt regulator.

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