The dummy load looks identical to the one K4EAA describes on his website. His has a couple of diodes to output the voltage from the load. Power can be calculated by measuring the output

Here's what I did https://groups.io/g/BITX20/wiki/Digital-Setup -- www.bitxmap.com

I built up Allison's (KB1GMX) anti-pop circuit on a small piece of single-sided copper-clad board, using Manhattan building techniques and MEPADS (www.qrpme.com) and I must say that it does an

I want to add the digital modes to my uBitx. Before I reinvent the wheel, I would like to know how to go about connecting the audio in an output to the uBitx. Do I put a relay or multi-pole switch can

Hi Jay, I actually have not cut any of the factory cables. I grouped them and put the clip on ferrite on them. I did not include the antenna (used some small coax for that). I will be trimming the

HA! We ran 200W into it for about 5 minutes and, while it could probably make French Fries, nothing was damaged. Still, we rate it at 150W for use as a DL or a parttime hand-warmer otherwise. Jack,

I've been a little surprised that someone hasn't already defined and published a "Hambus". Maybe base it on 20 pin double row(40 pins) m/f 0.1 pitch connectors. Define pins for RF, IF, AF, I, Q,

Rick, I will try to record a video of how to do it. - f

W8TEE has summed things up well. I wouldn't have used such a polite term as bullcrap! As for trading standards closing him down if he had been in the uk, totally delusional, trading standards can

Well, this has been interesting... I started playing with a relay, which worked, but on the air testing with a local amateur made me wonder if "maybe" I had the radio setup improperly. He said my

Mr. Farhan, I love the radio and I am enjoying the process of learning how more of this works as I go! Sorry some people took my thread with 2 questions and turned it into a soapbox... Can someone

Chip: It you like, I can walk you through some diagnostics over the phone, provided your scope has sufficient bandwidth to use it to trouble shoot. What is the bandwidth of your scope,

when I saw that in your book I remember thinking if my boiler quits in the middle of winter that would make a nice backup! -- www.bitxmap.com

Very true!

Why not just feed each base with a capacitor from the pre-driver and add a 1k resistor to gnd from the base of the pnp? Then the biasing isn't a problem. tim ab0wr

The DL I mentioned the other day has this resistor pack: in it, which has 20 3W 1000Ω resistors sitting in a bath of mineral oil. Overkill by a factor of 20 for QRP, but great if you work both QRP

Chip It is possible to use your oscilloscope to trace signal flow, but the scope needs to have adequate bandwidth for the signal being viewed. A diode detector (1N4148 diodes work fine for all but

Most who have performed detailed tests seem to indicate that unwanted spurs are a problem only if AF or RF drive levels are set too high. On CW the uBITX does not use modulation and thus has low

If anyone is looking for a kit here what I have https://qrpguys.com/12w-dummy-load-power-meter sure you could piece together the parts for a little less but I didn't have everything on hand. --

I am reading this thread. I really have no comments except that there is no objective measurement or audio clip that i can comment upon. Hence let me make some general comments. As old timers will