Tony Since you have another QCX-40, why not use it as a comparison source to see what is different between the two units. The difference may be in the state of activated buttons instead of simple stat

More likely a wiring problem. Was the rig purchased before or after the "bed-of-nails" testing system was implemented by QRP-Labs? There were some builder caused problems due to over-heating the switc

Allison Well said. Thanks. Arv _._

Jakob When designing and building your RF power meter if should be possible to add extra functionality above the simple dummy load and RF detector, and even more functionality than is provided by a si

#dummyload #power

Very impressive. Arv _._

#dummyload #power

NQ5P Use your calculator (or one of the on-line calculators) to determine the impedance of each coil and each capacitor for a factory BPF near the center of that band. Then reverse the process to deri

On Sun, Apr 25, 2021 at 9:50 AM Daniel Curtin KF4AV <danieljcurtin42@...> wrote: Dave, Hans may give more detail, but in v 1.04 the operating instructions, section 4., were pulled out as a separ

Did you install the jumper that connects the ADC to the battery voltage divider? _._

#40m #display #qcxmini

Guess I should have pointed to the rather simple and fairly safe method. https://www.google.com/search?newwindow=1&client=firefox-b-1-e&sxsrf=ALeKk029TP-5p2HrXLuA1vxKsKbeuZrjmw%3A1618608653836&lei=DQJ

Timothy For some of us it is a memory issue, instead of a lack or knowledge. Getting old is not fun! FYI, if you want to solder to a chrome plated item, you can electroplate a thin coat of copper over

The sequence in which each routine is performed may affect relative timing. Some things like writing to the LCD sound like they are non-critical and can be performed at the tail of a main loop, but so

It is possible to break just one I/O function (or multiple pin functions) on an AVR-328 chip by abusing it. These i/O sections of the chip are not all that delicate but they can be damaged by gross ab

Approximately 1/3 of the total power in a square wave is made up of 3rd harmonic energy. Because of this it only takes a tiny bit of harmonic attenuation to start changing the square wave into somethi

Wind power from the beans? 8-) _._

Hans Do I sense a near-future tutorial on how to stage one's QRPLabs transceiver for emergency use? Similar problem solved here by having a fully charged 12V wet cell in the garden tractor. Also have

Use your scope and start at the audio output. Find the distortion footprint and follow it backwards up the audio chain to where it is not present. That should put you very close to what is causing the

😁

But I wanted burple! _._

The OP has already apologized repeatedly and promised to not post again in this group. What more do people want...his blood? _._

Tony Yes, you seem to have isolated the culprit. Arv _._