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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

The uBitx works well enough as a CW rig out of the box if you have clean enough key contacts. Here's an old post regarding possible enhancements: ? ??/g/BITX20/message/36947 The

?I actually sorta like a wider bandwidth, unless I have a really interfering signal. A couple decades ago I remember actually building a LC audio filter --- toroids & capacitors and maybe even a

I listened between 7 and 7:20, and heard some signals, but nothing out of the noise. i called CQ Mico Bit X several times. Thought I heard a response, but Noise level is high here on the Border line,

A while ago I built a 4SQRP group HiPerMite CW filter in a mint tin to put between my headphones/speaker and my receivers.? There are others out there, but this one is a proven performer and I'm very

Ehhh! Listening to cw with a 2.someKHz filter is good for you! It will hone your cw listening skills and let you learn to pick the right signal out :-) In all seriousness, Gordon’s suggestion of

I doubt there's any non-volatile memory on the RPi other than the SD card, as that involves more process steps when building a CPU chip. Here's an 8 Gbyte SD card for

Just add an audio filter to achieve whatever bandwidth you prefer would be my suggestion