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I will definitely try this.

So i heard about the diode/pot replacement, but I can’t even find the dual diode on the board or where R105 used to be. I am keying the transmitter into a dummy load and monitoring with a scope. I

I think we need some numbers here. What is the gentleman's peak output, measured and whatever method he has, either watts, or even a relative reading on some swr or other indicator.... Exactly how is

I remember that Farhan posted something a while back that said if you are driving the PA too hard you will see some carrier. Decrease the PA drive (RV136) a bit and it should go away. Michael VE3WMB

Your quick! Jerry

Most of these seem to have the carrier pretty well suppressed without adjustment. The change to the dual-diode bat54s was made to avoid the need for such an adjustment, since the two schottky diodes

See this post: /g/BITX20/message/33585 Vince.

I understand that. But if there's voltage on that resistor, whether or not it's connected to the raduino, there will be carrier. That's how my tune mod works - key the mic or press ptt. Audio not

Exactly. I haven’t worked on a SSB rig that did not include a carrier null adjustment. Kind of surprised.

I would like to see that as well. 73’s WERNER G VAVKEN, WB6RAW wernervavken@... Cell: 408-375-6165 New Address: 39140 Gray Squirrel Road Temecula, CA 92592

I guess what he means is that when he keys the PTT, he has some rest-carrier (even when no mic is installed, so without modulating). 73 Allard PE1NWL

You have carrier? Did you add the CW mod? (10K resistor) Vince. -- Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/ http://www.metalworkingfun.com

Just finished building out a new BITX40 board. Works, but there is a LOT of carrier when keyed (no mic installed). I take it from previous posts that the diodes and null pot (R105) were removed. Dont

Is there a drawing someplace that shows component placement on the board? Trying to find the components on the board from the schematic is giving me a headache! KJ7UM, Grayson

arv, the original intend was to get a 'toy' FM broadcast transmitter going to provide simultaneous translations for an international conference of organic farmers. the crystal swing wasn't enough to

Farhan Phase modulation was popular with commercial VHF radios in the 1950's era. Maybe it works best with high impedance resonance? If that is the case then the modulated stage could be a JFET or

Arv, I could never get the indirect modulation to work. Perhaps you could play with it. - f

Hans & Farhan There is always reactance or phase modulation. Arv _._ wrote:

While you're waiting for the delivery of the 10T pot, you can already start with the rest of the modifications. Although highly recommended, the 10T pot is not strictly required - the software will

To be clear, Farhan is modulating the PLL's 25mhz reference, not using the output multisynth dividers. Perhaps the si5351 is designed to quickly follow changes in the reference oscillator, but do a