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OK, so IF-Shift is just a BFO offset (relative to the crystal filter passband)? that is for receive only, the transmit BFO offset generally stays put. Makes sense. I went off into the weeds there

Jerry Most commercial rigs have an IF Shift or Passband Tuning (PBT) control. This control can help with removal of QRM on receive (e.g.by eliminating a strong carrier or another station on the edge

I think my first post on this thread was simply incorrect. I don't think adjusting? SECOND_OSC_USB? would fix anything. Unless perhaps we are somehow running up against the edges of the 45mhz

Hi Jerry ( and whoever else is reading) I checked my master oscillator freq , when raduino was cold, and everything else was warmed up, and found that it still says 2k high right off the bat. So, I'm

Nice job Nik. Eagerly awaiting your results. 73, John (VK2ETA)

Jerry. I programmed something similar to what you said. I just added another setting instead of a constant(SECOND_OSC_USB). The code is shown below. if (isUSB){ si5351bx_setfreq(2, SECOND_OSC_USB -

Yes, I will test it as soon as you issue it. Mo and tue I'm going to be at home....so. Hope to hear you from some SOTA summit soon. Carlos Always tks for ur job!

Thanks Terry, I am sure everything is good.? Just excited about getting the new ubitx. Dave kn4ok

Though Ian has responded, he seems to know what's going on here.

I think I was wrong in my previous post, shifting the value of SECOND_OSC_USB won't help. The audio frequencies through the?crystal filter should be strictly a matter of where the BFO is relative

I agree with Hans and I think when the common sense fail a reminder as this a very good option for the health of the blog and the group relationship.

Clark Martin KK6ISP As a general rule, one of the terminals on an electret mic is attached to the metal case while the other is insulated from the case. The terminal attached to the case is ground.

Carlos. Wow great! It is very nice graph. My plan is to climb mountains with only uBITX. And it sends WSPR by each band and communicates with built-in memory keyer. I will Search your callsign in

Philip. You are right. I used the trick to reduce the program size, which did not work as I thought. Using a function called SetTxFiler will solve this problem easily. After the weekend, I will update

Afterthought: perhaps feed the electret from the base of a PNP? Dex

Dex You are right on. Since the electret microphone uses a microphone voltage resistor inside the uBITX or BITX-40 (or any older BITX with electret microphone) it is possible to sense voltage drop

Gerald Thanks for feedback. Errors that apply IF-Shift on TX will be corrected soon and will be included in the next version. If you test a bit more about IF Shift, we can improve it. Ian KD8CEC

I am not clear on the mic wiring. - Is it polarized (which terminal is which on mic)? - Is there a capacitor that is to be included in wiring?

Fanciful, perhaps, but would it be possible to detect the current drain of the electret as a PTT? Enough resistance in the feed resistor of the rig should take the electret voltage down to mid-supply

Jerry The IF Shift function should only be applied during RX, but it sounds like it is being applied during TX in error in KD8CEC's sketch.? Probably a bug. However, the op shouldn't be using the IF