[ARC5] TCS Xtals

[Henry Mei'l's]

Robert,

I'm aware that the top has been removed by someone  -- exposed xtal slabs is not a good idea.
Thanks for the id info. 
I also have a 3 MHz two pronged unit, slightly wider and less thick than the TCS unit:

RMCA
CRYSTAL UNIT
Radiomarine Corp
        of
    America

FREQ.Kc      SERIAL
 3000            B54921 
MODEL       TEMP
  R-1              35 oC

I cud check my periodicals tosee if 3 MHz was used as a maratime fequency or whatever.
I have gotten this unit to oscillate.

I did a freelance mod (oops) on  a paratrooper transceiver for Radiomarine, Manhattan
just when I got out of high school, back around 1960 -- think the units were to be used
in South America on the 27-28 MHz spectrum.

Henry
 
  ----- Original Message ----- 
  From: WA5CAB at cs.com 
  To: meils at get2net.dk 
  Cc: arc5 at mailman.qth.net 
  Sent: Tuesday, May 17, 2011 9:00 AM
  Subject: Re: [ARC5] TCS Xtals


  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


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