[ARC5] SCR-522, AN-ARC-3 Crystal "Suitcase."

[David Stinson]

If you've never seen one of those "suitcases" used to organize crystal 
sets for the SCR-522 and AN/ARC-3, here's one.  I haven't worked on 
cosmetic restoration of it yet.  It's double sided; close the lid, turn 
it over and there's another lid with a bunch of crystals.  Red-marked 
for transmit, green for receive.

There are no "official" markings; only a few pencil and pen notes made 
by hams.  It's obviously "home-brew," made of plywood.  Two sheets of 
clear "perspex" (?) are drilled with pairs of holes to hold the crystal 
sets.   Some are missing, of course, but most pairs are there.  They 
range from 100.16 MC to 154.1 MC.   After all these years, they've 
drifted for any number of reasons.  The operating frequency of many can 
be off as much as 30 KC.  That didn't matter a lot when the selectivity 
of such a set for usable comm signals might be as wide as 100 KC.  That 
"slack" still works for casual air traffic listening today, but if one 
wishes to transmit (on Two Meters- oh of course), one will need 
something better.

GL OM DE Dave AB5S



-- 
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20200503/6790734a/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: bfijnoknnmaklaok.jpg
Type: image/jpeg
Size: 136608 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20200503/6790734a/attachment-0001.jpg>