[Milsurplus] questions re early Stabilized Master Oscillators

[David Ross]

   Before varicaps came into common usage, Collins used saturable 
reactors to electrically adjust the frequency of PTOs in their 
Stabilized Master Oscillators, specifically in early ARC-58s & TRC-75s & 
URC-32s.  (Similar function to a varicap in modern VCOs.)

   I have never seen a Collins SMO that used a saturable reactor -  my 
guess is that as soon as varicaps became available, all SMOs with 
saturable reactors were removed from service and replaced by SMOs with 
varicaps.

Question 1    -    Did Collins use saturable reactors in any other 
SMOs?  (that is, other than early ARC-58s & TRC-75s & URC-32s)

Question 2    -    Did any other manufacturers use saturable reactors in 
SMOs or other PLLs?

Dave Ross    N7EPI