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Oh, I forgot to add that we can make the ATmega328 even easier by eliminating the 16Mhz crystal and the two 22pf caps, and use the internal 8Mhz clock which runs a si5351 and OLED display just fine

Dave, Solder a wire to the 2822 audio chip 12v in PIN 2 and monitor the voltage when this audio dropout happens. A plated through hole may not be conducting properly if the voltage is dropping! OTOH,

Jack, You are so right about the clones. My first was a authentic Arduino UNO that I bought from Radio Shack for 30 bucks, (so I've paid the tax), now I have maybe 40 clones of all flavors including a

here's what I did... /g/BITX20/wiki/Digital-Setup -- www.bitxmap.com ( http://www.bitxmap.com )

I want to say no it does not. It seems to be happening only when the vol pot is at half way position, or higher, and a loud station comes on.? I hear a crackling noise as the sound drops out fairly

Hi all, Some more testing and mods. Measured efficiency of the PA only when RV1 adjusted for 10W output on each band (current measured through the PA-PWR line, current is zero during receive): 80m?

Hi all, Some more testing tonight. Measured efficiency with mods per earlier post was low as follows: Band ? ? ? ? ? ? ? ? ? ? ? ? ?? Efficiency 80 ? ? ? ? ? ? ? ?? 29%? ? ?

Since your building your rig from scratch this will be easy for you to accomplish. Once everything is working. Modify the amp that the microphone feeds by doing this: "I lhave changed just R63 so now

Is there a non-SMD board version available, SMD is too small for me. If you have the eagle files, I could send off to OSHPark would be fine. Thanks. Dave k4em

Incidentally, what is your call sign?? I want to listen for you once you have the bugs worked out and the rig up and running. wrote:

What ever the outcome you did great! Most people did not build from scratch and source their own parts. Too bad my lack of knowing your language may make it difficult to be of much help. However, let

Thanks, Lee. ?I already have the book by Jack. ?The kit of added parts seemed like a good buy and I thought the PDF which was corrupted would help to explain how some of the components could be

I bought an el cheapo USB soundcard on eBay, also because my laptop has a combined audio port. Has been working great for me combined with a USB cable for CAT control. John KG5WJQ

OK I got formula,Then using this,how to rewind the output transformer?

Foko:? First, congratulations on the dead-bug scratch built BITX.? ?? I too had instability problems.? ?That is normal.? ?You just have to be patient and think logically to cure the problem.?

I bought the Elegoo starter kit for $30.00 and it came with a little CD with all the files on it. Was well worth the money. You can go to the Elegoo site too and download their starter files. I am

First check if your VFO and BFO are working correctly. Put an oscilloscope to C100 and see if you have a good voltage of your BFO frequency. Check the frequency of BFO with a frequency counter. Put

Thank you for your reply. I also tried to make the wire connectivity in Baofeng mic and speaker according to the post in this threads :?/g/BITX20/topic/4554574 (

Rogier, Ralph, the entire sketch is contained in raduino_v1.27.xx.ino You don't need the other one (raduino_diag_v3.ino). That one is only for diagnostics (troubleshooting any hardware issues). You

I built a Bitx dead-bug-style for 40 meters based on the Bitx20a schematic but I have some oscillation problem. I set the driver bias and both final biases to 50 ma and the drive adjust about a