[R-390] Collins 75S-3

[David Hallam]

In this distinguished group, I assume there are any number of you who are
knowledgeable about Collins ham receivers.  I have recently acquired a 75S-3
receiver.  In going through the manual, I wonder if there is an error
concerning the location of auxiliary crystals, Table 2-1.

According to the manual, band-switch position 1E - 28A is furnished with a
15.8275 MHz crystal that covers 28.5 to 28.7 MHz.  However, it also states
that in this position crystal socket 2E is connected.  Going through the
schematic, it appears that crystal socket 1E is connected in position 28A,
which I would assume is correct.  Table 2-1 in the manual does not make any
mention of socket 1E.  Is this an error? And is socket 1E actually connected
in band-switch position 28A as the schematic indicates?

If I put in additional 10 meter crystals, does it make any difference
whether I put them in 1E, 2E, or 3E?

David C. Hallam
KC2JD