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Hi, I don't plug-in or unlug anything wit the radio powered. Notthe uBitx. Not the PFR-3, not the Johnson Ranger, not the SW-3 (1933 vintage). Most of the time it's okay but can cause real fireworks.

The uBitx does transmit out of ham bands but the change of filters is set in relation to ham band edges. Example for 40m, the 7-10Mhz? filter is switched ON when the frequency is set above

What is happening on my radio is that the tip shorts between the ground and the ptt as it slides in. Keying ptt. It shouldn't be putting out much power as the mic is not active until the last

LOKKING FOR A QCX TRANSCEIVER. band not important. must be in the uk...

Which version of the uBitX? If it is a v.3 board most likely the audio amplifier chip (begins with WX) has failed, a common issue. If it is a late version of that board the chip will be in a socket

As I understand it, the VFO is not changed UNLESS you have the RIT set.? I should have asked you to verify that first. 73 Evan AC9TU

See - thats what i really like ham radio for. There is no technical or practical reason to spend month on getting the 50 years old HK equipment back in shape - except me finding it fascinating. I

Hi Rich, thanks for the diagram. Will give it at try. Armin, DJ2AG

Mark, I'm in the process of getting a BITX40 (waiting for shipping notification and tracking number) and those old Heathkit days are moving into hazy history and a desire to never revisit them. The

Bob, i deeply respect long time hams sharing their vast knowledge with new-to-ham Operators, but i really didnt expect this discussion to start. Sure its not necessary, nor is it necessary that i

This is a fairly old thread but I recently did some testing on my own version Si5351 board with buffer chips on each output, which maybe of interest.?? I only tested 2 outputs, 0 and 2, for

I'm attempting the same thing.? Would be grateful if you'd elaborate on the signal conditioning circuit. Thanks! rick

Hello, all! I finished the assembly of my uBitx and case. I turned it on and it seemed to be working. I did not have an antenna attached so was only hearing noise, but It would only stay on for about

Thanks again.? Question wouldn't calibration impact both receive and transmit?? In this case receive seems spot (same frequency matches on Yaesu and ubitx and can zero beat on tone) on but I think

You are welcome, though it the transmitter is off by 3khz, that is an indication that the calibration is off, and the 3khz off would put it outside of the 2.5khz bandpass for the 12mhz filter.? I

From the HF signals schematic and wire-up diagram (original V3 sourced in ~Feb/March 2018), it doesn't look like the designer anticipated that the Mic/PTT plug would be plugged-in after uBITX

I am going to declare the audio pre-amp a success.? To compare I generated a signal off my signal generator into the air? (no direct connection) and listened for the lowest level I could hear it on

This whining is always there even if i disconnect the antenna so i believe this is not corelate to bfo (and yes i have set the bfo properly). When i touch around the ubitx board, nothing i touch

The stock software for the uBitx does cut the VFO so that there is not any RF out.? There is a check on the VFO setting below 7.000,000.1 to shut it down on transmit.? I have not checked on where

Hello. Here is my ham information and at the bottom, you can see details of an End Fed Dipole that has worked for me. I have made many of them but the way you place the coax is important. Check it