[R-390] Capehart made R-390A Serial #312

Karsten Simon karstenpg.simon at web.de
Sat Apr 12 07:34:32 EDT 2025


I am done with checking and realigning (wherever possible) the various
crystal oscillators. One issue still open:

The Y501 crystal (455 KHz crystal filter) is missing. Will have to get a new
one made by Quarztechnik Daun (Germany).

Question:

.         Will this replacement have influence on R502 and R503?  (-> Note 1
on Circuit diagram = Fig. 5-13 Sheet 3 of 4 in NAVSHIPS manual
0967-063-2010). If so, how do I determine the correct new values?

-- Karsten --



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