[HBR] 160 Meter Coil Data

[Hopperdhh at aol.com]

Hi Walt,

Yep, I understand what you are saying about the 3 point tracking and having a 
few more adjustments to set the tracking points.  I know that it is much 
easier to make it work on paper, too.  Hi Hi

When I ran the program (its from Australia by the way), and posted the table 
of errors, you could see the 3 points that the error crossed zero.  But one 
point was very near the band edge.  Probably since the error was so small, the 
program didn't try to improve it.  I downloaded the source code and will look 
at it when I get time to see if I can figure out how it works.  I would have 
thought that the center tracking point would either be in the center of the band 
(average of the band limits) or the geometric mean (square root of the 
product of the band limits).  There have been several articles in the ham journals 
over the years, and everyone seems to have their own approach.  I usually make 
copies and file them, since it is kind of a hobby.  Like I said earlier I 
wrote some of these in a past life!  Did a lot of plotting of the errors and know 
exactly what you are talking about.  You probably know more about the 
practical side than I do.  But I did learned a lot by writing those programs and 
plotting the results as changes were made.  Models are neat when you can see real 
world results.  I usually do the calculations, then go to the Q-Meter to see if 
it really works.  I'm always surprised when it does.  I guess that's what 
keeps me interested in electronics.  It still amazes me.

Well, I think we agree on three point tracking.  Not needed much in a ham 
bands only receiver, but its nice to know how things work.

Thanks for the reply.

I have read some of your articles in Electric Radio.  Good work!

Regards,

Dan K9WEK