[Premium-Rx] R1451A

[Bill Tweedie]

Hi All
For those who are interested-
This set appears to differ somewhat from the VLF version.
Single conversion fron 0.5 MHz to 8 MHz with 455 KHz IF with filters from 0.1KHZ TO 16 KHZ.
Double conversion from 8 MHz to 32 MHz. First IF is 3.455MHz ( incl a 'roofing filter' at 3.455MHz) 
then 455 KHz through 455KHz filters to selectable AM and product detectors.
Has an ISB facility with two mechanical filters, one for each sideband in addition to the above filters.
Has a fixed 455KHz BFO plus a variable facility from -8 KHz to +8 KHz.
FET front end with two RF stages & attenuator.  Extensive shielding section by section.
It is likely that oscillator radiation was minimal fro obvious reasons.
AGC & manual controls. Construction is a work of art.  Circuit boards are 
Would have cost a fortune to produce in the 1960s.
Bill