开云体育

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

I had a new idea for mine. Which basically works except at night. I have a couple bandpass filters and the software changed to cover all freqs. I'm going to use the low level VFO output as a signal

The readers are probably going to need more info in order to be of some help. While you may have mentioned the issues in an earlier post, most readers would prefer to have the (remaining) issues

Still no worky ...

Set the VFO to 4vpp as mentioned in the article.

There isn't one. Forget it. ? <SoftwareControlledHamRadio@...> wrote:

I just completed my 2nd Forty-9er too...getting ready to see if THIS one will work! ?Wishing us both some good luck.? Jim - AD4XX Sent via the Samsung GALAXY S?4, an AT&T 4G LTE smartphone

Hi Again, 49er still no output (audio) from 49er -- no worky... I've calibrated the DDS VFO frequency to readout accuracy and sending ~2.5V, P-to-P signal to 49er mixer input. I've ordered another

RIT pin? Wheres that? Thanks, Jim - AB1BR

Jack, you've gone thru a lot with me and others about the TWO errors on your excellent article! I'm thoroughly enjoying the tinkering time, using my scope, etc. No rush to make a QSO, but I'm getting