[Premium-Rx] Harris RF-590A IF Filter Board Schematic Diagram

[Peter A Schroeter]

Gentlemen,

I own an RF-590 receiver, and have read several past posts concerning the
design flaw of the 590's filter board and its below-par stopband
rejection. I understand that the filter board in the 590A had been
redesigned and does not suffer from the same problem.
I have been in touch with John Reed KA5QEP who was very gracious in
providing me with information on the replacement filter board he designed
using relays. Indeed, I am in the process of laying out a PC board using
his schematic.
I would however be interested in obtaining the schematic of the 590A's
filter board to see what Harris did differently.
I also tried contacting Dallas Lankford, who apparently has or had a 590A
board, but the email address I have for him is no longer valid. Anyone
have his current email address?

Thank you very much in advance,

Pete KA5FUN