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I see the complexity and cost growing exponentially. That's fine but I really don't see the uBIT-X as suited for going in that direction.?? It depends.? If you can fabricate a transceiver that

To continue a little further.....I see those who are interested in DSP and other number crunching applications will require a RPi, Teensy 3.5/3.6, or STM32F4xx/STM32F7xxx microcontrollers for

finally after all the years running a stock 20A I’ve done the voltage stabilizing mod and the varactor tuning mod with a 10turn pot, and I think I’ve worked out the L7 windings now to get into the

In keeping in line with Farhan's $100 goal for the Transceiver, I would seriously look at using the "Protoneer" mentioned by some others. It has the "Nano" form factor, is Arduino Zero based, runs at

I made one from two carbon blocks, in a vertical configuration, with a dimpled area and a pencil sharpened at both ends.

Thanks Ron I'll have a look at WeeWx 73 Chris

I'd bet worst case latency on a not seriously loaded RPi is less than the milliseconds it takes us to load a new clock frequency into the si5351 via 100khz i2c. A google for "Rasberry Pi RT" shows

So far I received 10 requests for parts as of now. I have mailed out today 7, the remaining 3 will be in the mail tomorrow. I expect the results to vary, because it if transistor dependent. Please let

Sorry, should have said "sockets" instead of "switches". -Jonathan

Bob, Nice diagram!?? I had a question about your "N/C" notation on the switches.? In some cases the line between the pins marked with N/C is solid and dashed in others.? What is the intent of the

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