The bitx40 was therapy for me when I was diagnosed with a serious medical condition. I knew that through the time of treatment and decision making, I needed a project to keep both my hands and mind bu

Its been a long time since I built the bitx40, but when I did, I saved the schematic to a file and sent that to a commercial printing company. I think I got 3 copies on huge paper for somewhere around

The Koss cs100 has an electret element and works well. I have one that I have used. Someone else on this board put me on to it. They are now about $20, but not long ago were much cheaper.

The crystal is not "bad" http://www.hamskey.com/2018/05/frequency-adjustment-of-ubitx-si5351.html

Being 1khz off is not "normal". It needs master calibration adjusted, NOT BFO CALIBRATION. Mine is hardly ever 10 cycles off.

It appears to me that your rig is coming up in transmit. I would take a look at the line for the CW key. Maybe something is not right with the 4.7k resistor that is supposed to be connected, or maybe

With a bitx40 detuned to 2 watts, I rag chewed for about 30 minutes with G0EVY Dave on 40 meter SSB. I do admit, Dave's monster antenna was probably doing all the work. QRP SSB DX is very possible, bu

I too was wondering the same thing. I would think if you are using a resonant mono-band antenna, or using a tuner to tune the antenna that the harmonics measure at the output would have an even less c

I just added 3 extension switches to my uBITX last week with ver 1.08 and all worked well. I did select the 5 sec delay, and I did make a small wiring change just to make wiring more convenient for me

#ubitx #ubitx-help

With my radio/engineering skills very much lacking, I probably don't even need to be trying to contribute to this conversation, but here is what I ran into on my build. My tx audio was very distorted

Used the stock mic element. Added the wind screen. I think 10 for 5 bucks from Amazon or ebay.

Just gotta figure out how to get some labels on these switches and knobs. I did not stray much from the well known modifications. I did wire the KD8CEC extended switch mod slightly different, using a

Band is pretty squirrely, (arkie slang), but still able to work N4DKD, KN4CCQ (QRO) and on the ubitx K4BBN, KD8WTB (weak) and AA4PG (extremely good sounding uBITX using 2.8 Nextion display). The band

Worked a couple closer high power stations (80 watts). Heard a station call but had weak signal. Still listening.

I retuned the antenna for higher in the band. I will try to make a few calls with the uBITX, this afternoon, on 7277.

My friend Bill, I certainly hurt to hear the legal woes of your blog which which I can no longer mention by name without fear of losing my entire retirement savings and more. After reading the blog po

Ran bitx40 with duinovox for several months until laptop hard drive crash. It works great. 50 states worked with 46 confirmed and 49 countries with 35 confirmed.

Could a person add an 8ohm resistor across the speaker jack on the NC pin? When you plug in the speaker it would open up that load and the amp would see the speaker.

#ubitx

Tim, it was done with a drill, dremel, and finished with a file. Drilled a 1/4 inch hole at each corner inside the measured lines. Cut the straight parts with a dremel, and finished with a file. It is

Middle Bitx40 in background. uBITX build in front.