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Only Q7 works as an amplifier. Q8 and Q9 are emitter followers, so no gain there. -- Ion VA3NOI

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I know this! You can reprogram one of the ports to accept an i/o signal. The black wire is the likely target. In my case, I blew up the i/o port connected to the red wire. You only need to alter one

ok, something weird just popped up. ?The raduino is now stuck in calibration mode. ?The red wire is not grounded. ?I have completely removed the wire from the harness and it is stuck in calibration

Your best bet is to measure the voltages, since you are unable to remove every transistor, easily. The one with the weird voltages should be your culprit. Marco - KG5PRT

That's what it seems like, but I am measuring q16, not a capacitor. ?I guess it is possible that it is reading capacitance in the line somehow, not sure.

Sounds like you are measuring a capacitor that is slowly charging from the current placed across it by the ohmmeter.

OK, so I started testing the transistors in the radio and I got one I think might be bad. ?I want to ask your opinion. I am testing the resistance between the base and the collector / the base and

Dave, yes it puzzles me too... Fact is that it does make a tremendous difference with my BITX40 (the birdie went down from S9++++ to virtually zero). Some other builders don't notice so much

Thanks for the info offer .I am a babe in the woods with the Arduino and put the post up to see if it is feasible before I try to learn how to do it with an SD Card. As it seems it may be OK to use

I've been toying with the idea of removing the arduino and using a Raspberry Pi 3 to facilitate everything from mode/frequency changes to CAT control and internal digital programs like FLDIGI WSJTX

Can you share the code for making the function button work please.

Hopefully this may help the gurus... I have had my Raduino for less than a week and it?has the usual tuning clicks. A few days ago I suddenly realised they had gone but they were back very soon

The EEPROM in an Arduino is good for an average of 10,000 write cycles and virtually unlimited reads. ?If you only wrote to the EEPROM when you actually updated an entry, the board would probably

Allard, One thing puzzles me about this. I can see that the signal from the synth is buffered quite a bit by the on-board analog VFO circuitry before being applied to the mixer. I don't understand

@PE1NWL Might be a dumb question but is it the toroid next to the DDS hook up. I can not see the label for it and want to make sure its the correct one.

Howard, I have used a teensy 3.2 to log data with upwards of 8 data points every 25 ms and logged it on a class 10 sd card. Let me know if you think this would work for you and i can give you some

From earlier posts I am led to believe that writing frequencies too often to the eeprom will shorten its life considerably. I had in mind the possibility of storing frequencies ad hoc which coukd then

Welkome to the Club. Hi. 73 john AD5YE

I built my BitX40 for USB so I could run digital modes and I use it a lot for JT65. The only mod I made was to replace the L5 jumper near the BFO with a inductor. I found out what value is used here