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Hi Group After several successful QSO's with my uBit-x (modified with CEC's software1.097 and Nextion 2.4 screen), my audio has started to go into oscillation if I advance the volume control more

Is this audio issue just for SSB or CW too?

I did this a couple of decades ago, for Packet. Also opto-isolated PTT (from RS-232 handshake line). Easy.

relay spec. http://www.farnell.com/datasheets/1918250.pdf?_ga=2.93847389.1110802892.1538956194-886024998.1504510882

Hi All. Following on from?/g/BITX20/topic/25208658 the filter boards are in, I will install one tonight and post up a PIC... I have added them to my ordering page, price is ONE cent

Mike this sounds promising. Thanks for the work and feedback. Joe

I would use the iso transformers like the ones they sell on eBay for audio. Joe

iz oos, I have a external USB soundcard connected with mini audio cables to the uBITX. And the normal usb cable between the laptop and the radiunio.? Are you suggesting I need a "easy digi" type

That's unbelievable! Wasn't the bad board layout causing it? Do the new version 4 have different relays and/or a different board layout?

coil details are toward the bottom of http://www.hfsignals.com/index.php/ubitx-circuit-description/ -- www.bitxmap.com ( http://www.bitxmap.com )

My guess is that you might have ground loops between the radio and the computer.

I sent Mike a private email asking if these were pin for pin compatible. While waiting for an answer I did some more research and find they ARE pin for pin. They are also available at Digi-Key under

So i finally got my SDR working at the same time as my uBITX while doing PSK31, and nothing blew up. Yea. The picture shows big spikes off the center, if I read this right.? Am I interpreting this

Wow great work Mike!

Ah Ha!?? Thanks...? I was looking at the main board schematic for T/R, not the Raduino T/R wiring. Thanks, Woody,? KZ4AK --

If what you have read is holding you back, perhaps you are really oriented more towards a production radio.? I personally would not count on seeing more than incremental changes, to the basic design,

I solved! Q32 was fine. R36 was not. Its impedance turned out to be infinite. So I replaced it with a 560ohm (it should have been a 470) and sensitivity came back. A signal equal to S3 is easily

What fundamental frequency was this for and have you tested other bands? This is good news, thank you for trying it. Clark Martin KK6ISP

Thanks Jack.? I wish I could say that I discovered this intentionally but, to be honest, it was completely accidental.? I had removed the original relays from my first uBiTX while looking for a

Mike: I'm a software guy and am a bag of hammers when it comes to the EE stuff, but this is very interesting to me, since we have so many people who are worried about the harmonics. Thanks for the