Jeff wrote: "Sometimes, we do things just because we want to do them." With the proliferation of cell phones and satellite internet these days, it's getting harder to justify my time spent on ham radi

#raduino

A good story, though not quite correct. In the mid 60's, NASA was using mechanical pencils (possibly leaving bits of graphite floating in the air) and the Soviets were using grease pens. The Space Pen

#raduino

That smart knob appeals to me about as much as a smart refrigerator that orders eggs when we're getting low. Which is to say: Not at all. Unnecessarily complicated. I'm with Dennis. Better off just sp

#raduino

Follow that op amp with a push-pull pair of transistors instead of an emitter follower for zero quiescent current. With a fast enough op amp and appropriate feedback, no need to bias them to deal cros

I've got a v3, but I believe all versions are just 2 layer boards. Adding internal layers would be a considerable jump in price. Could well be that the issue is around T9, and the discoloration you re

I would recommend keeping the sBitx discussion here until the extra traffic is a problem, if that is ever the case. Those who are somewhat interested can keep up with news on how it's going. And the s

If you had enough current through a primary winding of T10 to burn it, then R961 is likely cooked as well. Not sure why you have so much voltage gain between TP4 and TP5 if T10 is damaged. Perhaps pro

T10 discolored? As in burnt insulation? The TX node is 12vdc during transmit, so a short to ground at TP5 or TP6 would indeed cause some discoloration. What is the current draw from the battery when t

Might be a good solution for ephemeral stuff that is so often posted here as attachments. They delete files in 30 days (unless you have paid them money). Or, we might also create special "temp" subdir

The proper way would be to build a diode RF probe for use with your DVM. Should be roughly 10dB of power gain (so a voltage gain of around 3) going from TP3 to TP4, and from TP4 to TP5, and TP5 to TP6

I think that image illustrates a point. Bulky ephemeral and/or off-topic stuff is ok, just post it as a link into our files or photos section and then remove it after a couple days. Jerry, KE7ER

Cat was poking at a box in our garage a few years ago. I dug around in it to see what she found so curious. Baby rattlesnake. Jerry

Perhaps I'll find out once I clean off the top layer. We had snow for 5 months, and have had lots of rain since. Waiting for good weather so I can pull stuff out to the garage apron and have room to s

Here's a photo of my garage, taken minutes ago. https://groups.io/g/BITX20/photo/275743/3440888?p=Created%2C%2C%2C20%2C2%2C0%2C0 Will remove that photo in a couple of days, as I doubt it would be vote

As someone who has lived with a low bandwidth (and severely data capped) internet connection in the recent past, I fully sympathize. As of a year ago, there were times when I could just barely read a

I have the ARC-5 transmitter I used on 40m CW back in the early 70's, still collecting dust down in the basement and in working condition. A good solid rig, built like a tank, designed back in the 193

As I vaguely recall, there was an article back in a mid-1970's issue of Ham Radio magazine where they built a complete HF transceiver, the only active components were 7400 series logic gates. Feedback

When I was 14 an older ham who worked with my father gave me stuff from his junk box that he no longer planned to use. Included some 810 transmitting triodes and a plate transformer suitable to power

Yes, 5v from the Nano can go back through the LM7805 and power the uBitx main board from the USB port. That's asking a lot from the tiny diode on the Nano. If you work with the Nano much, it is very h

Yup, remember the ARC5 well. Mostly fondly. I was using an ARC5 receiver and transmitter on 40m CW while a college student in the 1970's. Designed in the 30's, they built hundreds of thousands of them