[R-390] IF Subchassis

[rbethman]

In spite of all assertions that Y-501 is SOLELY used as a crystal 
filter,  It would perhaps be of value to *carefully* look at TM 11-856, 
Figure 106.

Looking at the schematic, It is very obvious that Y-501 is ALWAYS tied 
to the control grid of V501 without regard to the position of the S-501 
wafer of the bandwidth switch.

The other end of Y501 is tied from its other side to ALL the positions 
of the S501 wafer for all filter positions from 2, 4, 8, and 16 positions.

I can indeed read the cited paragraphs!  I've done so.  They do NOT, 
however "change" the circuitry and the feeding of the internals of Z501 
to V501 whatsoever.

Exactly "how" two positions of S501 result in .1Kc and 1KC filtering, I 
do not know.  I won't dispute the "written" function in the cited 
paragraphs.

However, it CANNOT be dismissed NOR ignored that Y501 is in "play" and 
feeds V501 ALL the time.

Bob - N0DGN