[R-390] Collins R 389 PTO

[Roy Morgan]

On May 3, 2009, at 9:18 AM, Mark Huss wrote:

> There are several DDS (Direct Digital Synth) VCO kits running around,

Mark,

I appreciate your comments, and will store them and those of others  
for possible future efforts on the problem.


> ..
> The PTO  covers 1.06 MHz in 10.6 turns, or 100 kHz in one turn.

Are you referring to the R-390 and R-390A PTO's?  The R-389 PTO is a  
different animal.  According to info I have the thing has a frequency  
range of  .470  to .980  Mc. and operates over 51 turns (probably just  
50 turns in use.)

That is 470 KC to 980 KC and FIFTY ONE turns.

I don't know what resolution you'd need.  But maybe if you had a VCO  
operating from say 4.7 mc to 9.8 mc you could divide and filter the  
output to get what's needed.


Roy


Roy Morgan
k1lky at earthlink.net
529 Cobb St.
Groton NY, 13073