[HomeBrew] (no subject)

[James Kearman]

Frank wrote:
> Can anyone help with a circuit diagram and information to define the three coax cables coming out of a Collins 70k5 PTO

You can find a link to a schematic of the R-390 here 
http://www.fernblatt.net/390.html near bottom of page. Should help you 
sort out the PTO. The PTO schematic is on page 9 of the PDF.

73,

Jim, KR1S
Author of upcoming "DXCC Handbook" from ARRL