[ARC5] TCS Xtals

[WA5CAB at cs.com]

Henry,

Your unit being open at the top means that someone removed the top cover 
and didn't replace it.  They are not normally open like that.  And the 
majority do not have any pressure adjust screw.    I may have seen one like that, 
out of hundreds.

The holder is functionally equivalent to the Signal Corps FT-249.  The most 
common Navy Type Number appears to be NT-40130 (based on how many of each I 
have).  Made by numerous contractors.

In a message dated 5/17/2011 1:48:38 AM Central Daylight Time, 
meils at get2net.dk writes: 
> That makes a lot of sense - now I know why there are 3 prongs on the TCS 
> xtals.
> Found the one I mentioned before:
> 
> 
>           QUARTZ CRYSTAL
> CRYSTAL FREQ    SERIAL NO.
> 1727.5 KC                   RW-14729
>     AXIS       TYPE      oC
>         A         I - G        25
> EQUIP MODEL       OUTPUT FREQ
>        TCS                     3000 KC
> COLLINS RADIO COMPANY
> 
> The "Equip Model" labelling, here stamped "TCS," -- could possibly imply 
> that these type
> xtals were also used in other gear and there might be some container box 
> for 
> them,
> not necessarily specific to the
> TCS.
> 
> My xtal is exposed, open at the top -- can see there's an adjustable 
> pressure screw.
> I will see if I can get it to oscillate.
> 
> (Here, [(1727.5 x 2) - 455(IF)] KC , yielding  a 3000 KC receiver 
> frequency).
> 
> Henry, Cph.
> oz3o n2nr

Robert & Susan Downs - Houston
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