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As I was building my bitx40 kit, I looked at the output of the Raduino board, and running standalone, it is a decent square wave signal, and it appears to have a coupling capacitor in the output, as

I haven't touched R136 at all, since i got the board. Assuming it was fine. I run it on a 13.8 power supply. But i did make the mistake of wiring the mic backwards and was wondering if they could

Hello Allard, I recently got my bitx40 kit, and due to to some foolish mistakes of my own, I had to replace the mega328 on the Raduino Nano board. As a consequence, I decided to go with the

here is the linked info. What is the cable impedance and when it is needed? The basic idea is that a conductor at RF frequencies no longer behaves like a regular old wire. As the length of the

For short lengths of coax at HF (not VHF or UHF) it wont matter what you use. the load impedance gets applied to the source -- Regards Sarma

There is an alignment process where you adjust R136 to dial in just 1 amp doing the ahhh thing. If you have done that and use 12-13 volts, you have a BITX on par everyone else. And holding the mics at

I too questioned my power out. So I set up my base rig identical to how I would set up the Bitx. Same 40 meter dipole antenna, same voltage in, same frequency. I did the haalllowww thing into the Icom

I recently had no audio drive. I bought a new electret microphone element at RS and rewired and installed the identical looking little unit. My question is, does anyone know the spec of the OEM

Allard, Thanks for the updated firmware. I loaded it last night it help with taking the birdie down a bit. But its still there. So i order the radiuno separate from the bitx40 board. the board is

I am planning to use thin coax for the Raduino vfo output, what would be better 50, 75, or maybe 90 ohm?

Yeah that was me. From the responses so far I concluded that 4mA is best value in most cases. In my case it made a tremendous difference: At 2mA the birdie almost blew my headset, at 4mA it became

Also, here is the code that worked or my Arduino Mega /* Main code by Richard Visokey AD7C - www.ad7c.com Revision 2.0 - November 6th, 2013 */ // Include the library code #include

I'm doing the same with the same AD9850 and Arduino. I have the BITX40 built and the DDS is built per these

Ok here you go, have to give Ken?G4IIB credit as he shared this code with me. You will need to change the encoder & lcd pins. You will also need to change the USB/LSB bfo frequencies to match your

Good grief! Phones, autocorrect, and poor eyesight just don't go together... "little bigger" should have been "little bugger", and "Tony and fragile" should have been "tiny and fragile"

Better check with ARRL. it is copyrighted. 73 Ken VA3ABN

Hey Pete.? Absolutely! Send me a copy, I'll give it a try.? Jack, I'll post an updated copy later on today. I don't have access to it from work.? Thanks again to everyone for your help and

If anyone has one, it will be someone here! I bought a used copy of the re-issued EMRFD, with the CD that has Solid State Design and Intro to RF Design on it. Unfortunately, the CD is damaged.

John, The crystal was my fault, I broke that little bigger in my efforts to re-attach it. Those SMT parts are really Tony and fragile. I have 3 Nanos on the way, but at least now I can check the rest