Hi, Good things come to procrastinators... This KV4QB site has a lot of interesting Ham related microprocessor projects. Including adding a TFT display to a uBitx. And a cool simulated analog meter us

#ft8 #cat #antennas #ubitx

The previous suggestions look like good suggestions. On the antenna testing front, one low cost possibility is to use a noise generator with a cheap SDR dongle (that can do HF frequencies) and a direc

Hi, The price for the signal generator you linked, $54 is really good. I'm tempted to order one as a second signal generator (with two I don't have to worry about what leakage there might be between t

What a great looking radio. Great workmanship. I like the shape and layout of the display and control panel. How did you make the front panel. Is it made with engraved sign material? Is the box an off

I learned something new from this slideshow: Why Are Cats Positive? For a reason that was not recorded, [Ben Franklin] identified the term positive with vitreous (“cat”) electricity and negative with

Yes, that is my understanding also. Particularly the case for 40 and 80 meters. So things that don't work well when transmitting can be gotten away with for receive only antennas. Tom, wb6b

Hi, It is common wisdom that the size, or capture area, of an antenna goes hand-in-hand with its efficiency in radiating or receiving radio waves. This was just mentioned in an ARRL newsletter. A piez

Hi, Is it possible that when the uBitx is receiving through the transverter the noise level will be greatly increased. At VHF and higher most of the noise comes from the RF preamp stage (rather than f

Hi, It is interesting that the Bell Labs film and the MIT film both came out in 1959. In reading a little about the presenters in the films it looks like this was no accident. The Sputnik satellite la

Hi, Here is a video (film), in 1959, counting individual photons with nothing but old oscilloscopes, incandescent lamps and a motorized spinning pinhole. Also amazing. https://youtu.be/HUsNFLpDsTw I l

Thanks for the links you included in the readme for your library. (Thanks for the library, too.) This link, from your links, is a great little simple overview for how to build digital filters and how

A great writeup. You have raised the bar for documentation for the rest of to follow. Clever solution to the pseudo encoder interface. Tom, wb6b

I have the PICKit 4 Programmer/Debugger and now that Atmel is under Microchip the new PICKit 4 box will program PIC, AVR and ARM chips. Although I also have an Atmel ICE to fall back on when the PICKi

Interesting. Try measuring the voltage on the keyer analog input pin to the Arduino. If it doesn't go up significantly when the resistance is increased, then try an external pull-up (maybe 10k) resist

#bitx20

Hi, If you are not already, you may want to try the CEC firmware. I believe that software allows you to adjust for the actual voltages seen on the analog input pin for the dots and dashes. There could

#bitx20

This isn't requiring the micro controller to do any heavy duty DSP type processing. I think it would be very fast. An Arduino Nano may be fast enough. However, as time has marched on, there are new fa

Hi, It is a simple circuit. But it does have the component parts discussed in the “control loop” versions of the subject. As the original asker asked how they work, most of the responses explained the

HI, An additional, somewhat oversimplified, way to look at the AGC control loop is this: If you consider the transistor (or other type of amplifier in the control part of the loop) provides 180 degree

Hi, Yes, that looks like it could be a good choice. Just be certain that the power level at that point, on transmit, is within the limits of the attenuator. Off hand I think it is, but there many folk

#nextion #ubitx #firmware

These may be a little overboard for the purpose but I have one of each of these digitally controlled attenuators that I bought to build up my tool set for making RF measurements. This one had the part

#nextion #ubitx #firmware