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Carbon mics need a bit more bias current. Most can be revived by physical shock, breaking up clumps of granules packed by gravity in storage/disuse. Challenge: the carbon mic that got me into

Sergio, Please look at this message (/g/BITX20/message/21621). Randy K7AGE measured all of the transistor voltages and attached them as a PDF. Please measure the voltages on your

A socket for the nano would help a lot. wrote:

Thanks Raj it's the first thing I did! I checked all the connections! By turning the VFO, the QRM increases on some frequencies but no QSO is heard. But stopping on one of these frequencies, if you

Lee:? Thanks for the microphone suggestion. Snagged it from a web site as a raster image.? Converted it to match the wire-up diagram. If you find anything else in error, please advise. 73, Bob

I have been using my uBITX exclusively on CW for the last couple weeks. After getting used to the idiosyncrasies of the radio, and using KD8CEC v 1.061, it's actually quite a CAPABLE CW rig. Whether

Brady The uBITx is never going to be a serious CW contest rig, but I imagine you are not expecting that. I only operate CW, never more than 20W. Having installed the KD8KEC v1.061 firmware to deal

Arv, I'm not using the carbon button,? "The original carbon element was bad so I put in a electret mic and MAX9812 module board"? See the picture of the button holder.

In continuation, i suppose that except salvaged ones , we may not be able to get carbon mics now a days. Regards MVS Sarma

Simple . It works with a DC bias and resistance variation of carbon granules packed in a mic convey the speech content. Only diffiernce is that the bandwidth would be much less as against electret

The one big difference in this application between the Raspberry Pi and a micro-controller like the Teensy and the Arduinos is how much overhead the OS imposes. Linux is a full blown consumer OS and

Lee It will be interesting to see, and hear, how that T-32 carbon button microphone works with the BITX. It may need some attenuation because carbon microphones usually output a fairly high level

Hello Alan, yes I have added a little 4 pin molex connector for D7 (T/R), the two I2C bus lines and +5V for my 2nd Arduino. All the best, 73, John

All true. As for impairments…blindness is, paradoxically, no big deal and also not for wimps :-) And ham radio has been great in a lot of respects, including in travel to other states and other

Poor reception... My receiver was one of the first to ship. I have made no modifications to it. The vfo seems to be about 2800 Hz off. My Drake 2B receives a signals with one foot of wire attached to

The uBITX was designed to use the pre-existing Raduino board. My opinion on a fresh start would be to put the Si5351A directly on the uBITX board, so only the I2C digital pins would need to be routed.

Buddy: There are some very interesting filters available in software where you can not only set the "center" frequency, but also the edges where the skirt "knees" are located. When I'm listening to

?man, my hat is off to you getting ANYTHING done with such impediments! More power to you!!!! If there isn't any statc---there's not much propagation

The microphone is a Model T-32 made by Kellogg Company for military communications.? It was sometimes used with the English T-1154 transmitter in WW2 Lancaster bombers.? Yes, they were used in many

Hey Gordon, Agreed about the super duper narrow filters. With all of the ways to crank down the bandwidth and peak the audio and reduce the noise and what not that are on my KX3, I rarely use much of