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I do have a scope Jack... There's no output from the NE602, therefore, nothing into the LM386 audio amp.. Wonder if I have proper signal level from DDS VFO(?) because that signal is offset more than 3

Do you have access to a scope to see if any signal is getting to the 386? If you don't have one, check your local community college/university or even high school physics class and ask if you could

OK on R8; thanks Hank. Still have no audio output from the 49er. I do have a connection from C8 to pin 3 of LM386, so thats not it. Any ideas or thoughts welcome. Thanks, Jim-AB1BR

Yep, I understand what you're saying. Oddly, some kit seem to have an offset and others don't. I can't tell what the difference is. Jack, W8TEE To: SoftwareControlledHamRadio@... Sent:

The purpose of the R7, R8, C7 circuit going from the 12v bus to pin 26/A7 of the Arduino is to act as a voltage divider for the Arduino to sense then display the input voltage. Buried in the

Jack, Yes a 2n2222 will also work ;-) Just a quick note - the mod does not implement RIT although it could be considered a first step to doing so. It implements a user defined (at compile time)

Thanks for clearing things up for me. A little slow at times. But when you mentioned tomtom or whatever on eBay, I checked their VFOs to see what you were using. :) As for the 49er, its the most

Lou: In your PDF that shows the mod on the key line for the Forty-9er, it shows the transistor as a 2N222. I'm assuming this is a 2N2222, right? Jack, W8TEE

I built my radio per the March QST article. I did buy the PCB and Parts Kit from K2ZIA but I bought most of my components from BangGood.com. They had the AD9850 DDS for about $10 and the NANO for $3

The 12V circuit that divides down using a 20K ohm in series with R8, 10K trimmer potentiometer. It apparently adjusts the voltage level on pin 26 (A7) of the Arduino Nano chip. What does this do and

No. The VFO we did for the article is based on the design by Dennis Kidder, W6DQ, who was co-author with me on the Arduino Projects?for Amateur Radio book. Farrukh modified Dennis' design when he

Whoops, still confused here. Thought you were talking about the VFO FROM eBay, which sounds different from the one in the article, from what I found on eBay from that seller. As for the 49er, I'll

For some reason when I "ohmed" There was no continuity from top of C8 (junction of C8/L1) to Pin 3 of the LM386. So until I added that jumper I had no audio... Once I did it worked fine... Thanks,

Keep me posted on your progress with the 20M rig! Bill

Yes I did March QST QRP 49er XCVR project but did not use the sources listed in it... The 49er board I have is identical to the one described in the article with the exception of R0... In talking to

ab6ui I'm not sure why you needed the jumper wire? I believe I have the exact same PCB as you. There is a PCB trace from the top of C8 (junction of C8/L1) that goes to Pin 3 of the LM386. It is

Did you do the March QST QRP XCVR or what? I bought my parts from the sources in the article not eBay. How did you interface the eBay vfo to the 49er? 73,Bo W4GHV

Not that is really odd. Why would the kit distributer make that change? Thanks for the heads up. Cool that you found the problem, worked out the issue, and fixed it. Haven't started on my own

Whoops. Thought you were doing the March QST project. What xcvr are you using and how did you add that vfo you mentioned to it? Progress? 73. W4GHV Bo

In trying to track this mystery down I found that R0 goes to Pin 3 of U3 to ground and apparently nowhere else? Obviously why I had no audio... So I lifted R0 and added a jumper wire from L1 and C8 to