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Don, I had a 220k provided with my 49-er kit... and I have to admit that I never considered this as an issue for the audio "problems" that have been popping up. Thanks for bringing it up. What really

FYI, I just received another 49er kit from China and it too has the 220k resistor for 2SK30 bias. It also has on the PCB a space for what they call Ro and is screened on the PCB as a 10K resistor,

I know a few manufacturers pump out these 49'ers in China....My instructions showed the value of R2 being anywhere from 220K to 1M. This resistor biases Q1 the FET that feeds the audio amp LM386. They

Thanks Jack.. With all your help and others, and after fiddling with it I checked it against some known frequencies on my 7600.. Mine is dead on.. However I have a new issue.. I'm going to post about

All: Don't expect the Tuning Constant to be precisely on frequency. The floating point math used in the code only has 15 digits of precision while the TC is carried out to 18 dop. The result will be

There seems to be a big delay in some messages. Disregard this last one I figured it out.. Steve NS3L..

I thumbed through the calculations and figure it out.. I got mine dead on frequency.. In my case is needed to enter 34.3602763936801857 to get mine to be right on 7025.00. It had been on tuning null

Ok Norbert. Now I get 34.3587601826567 73,Marty

Would it be possible for the March 49er article to be posted to the Files section in PDF format?I don't get QST, and for me to go to the central library to get and read the issue (if it even there and

Hi Marty and Steve ! The tuning constant number that we are looking for should look like 34 dot something. I got 34.35876018265670 (14 digits after the decimal point). This is the same format as the

Thanks Marty, I tried to follow what Jack had as far as calculating this and I think I got the TW, but not the clock number.. It seemed my numbers were coming up wrong.. Close but not like your

I ran this into Excel and got 0.0343587601826567 for the tuning Constant. Copy and past values from the spread sheet changes the precision from the cells. Hope that is what you wanted. 73,Marty WD9GYM

Jack, I'm having a bit of a hard time grasping this.. In my case my VFO is showing 7025.200, but I need it to drop by 200 to show 7025.00 and align with my signal generator signal. I did the one

Got my number 2 49'er working and the receive is there... Still need to do the TX but figured I'd get the VFO calibrated first. Since I don't have a version of excel that will open this new file can

Nice! Thanks for the contribution...

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the SoftwareControlledHamRadio group. File : /My_Tuning_Constant_Calculator.xlsx Uploaded

Hi! I think I have the tuning constant figured out. I was stuck at the end and reading thru Jack's message I saw that the TW needs to be divided by the VFO display frequency on the LCD. On that last

Nice Build...love the case! The BCI filter (see early photos) I detail will knock the slats out of any local broadcast interference. I have an article coming out on it in CQ Magazine this summer. That

The receive is pretty good except for occasional BCI that seems to be common in these simple transceivers. Because I did not have the correct transistor for the final, output is less than a half watt.

Hi DuWayne, Very interesting project. I liked the can enclosure, very creative. How is the performance of your Canned Frog ? I also noticed that you have some cool projects on your blog, keep us