For the record I was replying to the surprising idea of measuring input power as a way to know how well the QCX is working. As an old timer like me you probably also used to tune up novice rigs with a

I should phrase it correctly like you did, the IF-Q balance and Phase Low and Phase High. That is really the correct wording. Not the BPF and LPF. But those don’t change with firmware.

Hi Al, Upgrading the firmware does not change the potentiometer settings (e.g. the BPF and the LPF alignment). However it could reset the oscillator cal frequency. This is the 27 MHz cal frequency

Did the upgrade to firmware. Now wondering if I need to go through the alignment steps again? Seems to be a bit off frequency or Im not reading it right. Got good low setting on the IF-Q Balance and

When you buy a QCX you get two packages. One has most of the parts for the QCX, including most of the parts that you need to build it for any band. The other has the low pass filter components. Those

The iron core materials are color coded. If the cores are the same color and size, they are probably interchangeable. If they aren't the same color, you still might be able to make something that

Download the 80 & 20 manuals and find the differences between them and the 40 & 30 manuals. Unless you want some other band(s), of course.

Bravo, Jim!

Hi All Due to a problem with my keyboard skills (I'm sure it isn't a sinister marketing ploy ..... joke!) - both times I have ordered a QCX kit I have received two. No problem - I thoroughly enjoy

Just to close this off: Actually, I didn't damage it at all (!). Took me a couple of days to get some SDR software up and running (gave up on Linux, so running HDSDR in Windows in a virtual

I don't think any of us here really need to know the power output of their QCX with accuracy traceable to NIST (or whatever the standards organisation is in your country). I think what most of us

I didn't want to be the first to say it, but that would be one of the most inaccurate ways to determine power output. Also, we're accustomed to dealing with pure(ish) sinusoids in RF measurements but

Still curous about what you find so funny about introducing kids to ham radio. Arv. K 7HKL _-_

Wat did you find so funny. _-_

Why do you need a calculator. It is easy to work out how much wire is needed to each turn and then multiply by the number of turns. You could also wind a piece of thin string in place of the wire,

All the assembly instructions for QRP Labs Kits are available online. You must have had time to download the instructions while waiting for your kit to arrive. You should have read the whole document

I had to rework T2. Bought 28ga magnet wire on Amazon. You might decide re-working T1 is easier with new wire. Also, be sure to scrape off the enamel coating before trying to solder to the PC board.

Hi, Steve So far, so good on the keeping safe. The XYL and I walk about 3 miles each, morning and afternoon, but try to stay away from folks coming the other way. Yep, looks like

Thanks to everyone who replied, I brought out the calipers and the multimeter and the wires are the same gauge and are both enamel coated. Not sure what their difference is besides color. I also did

LOL big time.