[ARC5] WW-II Crystal

[Jim Haynes]

The book we were talking about has tables in the back attempting to show
where all those crystals were used.  That's a hard question to answer
because of the variables.

Each ARC-5 and predecessor transmitter, and many thousands were made,
used one crystal for the life of the radio.

Each SCR-522 and ARC-5 VHF set and ARC-4 held eight crystals, four
for transmit and four for receive.  But those are just the crystals
the set will hold - there had to be many more in the shop if frequencies
changed from day to day.  Each ARC-3 set held eight in the transmitter
and eight in the receiver; but probably no more in total than the 
4-channel sets since the frequencies were all chosen from the same set.
So the total number of crystals is the total number of sets multiplied by
some number bigger than 8  and maybe less than 50.

So  it's really hard to estimate the total number of crystal units
required even if you know the total production of radios that used them.

jhhaynes at earthlink dot net