[Premium-Rx] Harris RF-551A for sale / need schematic for same

[Jim Sorenson]

Gentlemen,

Gentlemen,

<>
A fellow ham here at the U.S. Embassy has a Harris RF-551A 
Preselector/Postselector that came our of a Harris system at one of his 
former posts. He would like to sell it and is asking $300 insured and 
delivered to your door anywhere in the U.S. or Canada. It’s in perfect 
condition and has the remote control tuning option built in. It does not 
include a manual. If you are interested, please let me know and I will 
put him in touch with you. <>

Vis-à-vis the 551 manual, I would like to know if anyone out there could 
provide me with a quick and dirty scan of the schematic for the 551A. I 
now have two working with the 590 and 1310 respectively in autotrack 
mode and wish to try determine whether or not it might be possible to 
derive any advantage at 1.8 Mhz. from a third unit if that unit could be 
tweaked down 200 kcs from its lower limit of 2.0 MHz. Some exploratory 
surgery using a scope and spectrum analyzer has cast great doubt on this 
possibility, however. Perhaps the schematic will tell me more about the 
limits involved here and what I might do to extend those limits.

Many thanks,

<>
Jim Sorenson

SU9AM/W3BH

Cairo