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OK Ralph, I decided that I would learn how and reload the original software. I have no idea what I am doing so I read a lot of web info and got the ch031 driver and the IDE loaded. In the instructions

BITX QSO Afternoon/Evening, Sunday, May 27, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere. Join us as we make contacts with our BitX-40s or uBitXs or anything else on 7.277 MHz

Thanks Jerry for telling me the slick way of stacking the discrete resistor on top of the SMD. Still in all I'd like to practice on something that I will not miss if I goober things up. Honestly my

One last thing that I should have mentioned. The heavy yellow wire in the picture of how I wired the volume potentiometer is the wire that comes from the positive side of the power supply to the

I thought you were having trouble with sound coming out of the headphone jack while in receive mode??? If you are having issue with sound on receive: Here are two pictures. One is a picture of the

I just finished a very simple attenuator mod to my BITX40 based on Don's (ND6T) simple RF Gain control mod :? http://bitxhacks.blogspot.ca/2017/01/nd6ts-rf-gain-control-with-tombstoning.html His

Look at your volume potentiometer. You have your yellow ground going to the wiper location on the potentiometer. I. E. Yellow and orange are reversed. I can't see the speaker connection but what I

He says he put a "discrete" resistor in parallel.? Could be SMD or thru-hole. Sticking a discrete SMD resistor on top of an existing SMD resistor is quite easy. As Allison says, it's like stacking

Wow, you must have a rock steady hand to parallel a through hole resistor alongside the SMD resistor. I would not say I have Parkinson disease but my hands are not that steady. I think I will see if I

Hi Allison, Used only a *pair* (not matched) of 2N5109's in the FET driver stage. (Emitter resistor dropped and cap added as per post. All other stages were MPSH10's with 220pF across emitters.. Since

Indeed, I initially thought to add a mic compressor, but reducing the value of R63 by adding a discrete resistor was the simplest thing to do. No smd was removed. It increased, probably doubled the

see also /g/BITX20/message/28886 73 Allard PE1NWL

Quick question. I think that what your doing is the following: Presumably the audio from the mic's audio line that carries the ac with a dc offset is first passed through a capacitor to block the dc

That is normal.? There are partial solutions available. Read the link I posted in my previous response for some options

Read the link to the thread I gave you in your previous post and you will learn the reason for this.

BFO should be something like 11.9965

When I matched the CW BFO calibration with the USB BFO calibration, then the displayed CW received frequency was the same as the transmit frequency. It was not possible to use a negative number for

Hi Keith, I believe your Raduino is still OK. But you probably reversed the collector and emitter of the 2N3904. Please verify that you installed the tranistor correctly. 73 Allard PE1NWL

My mistake, when in setup/adjust BFO the default is 11.665, my error with the 12.nnn. Al

Right off hand I would say the BFO is way off, probably on the wrong sideband so to speak. It is usually around 11.996.700, some where around around 11.996 something instead of 12.something. It may