[ARC5] TCS Xtals

[Henry Mei'l's]

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




----- Original Message ----- 
From: <WA5CAB at cs.com>
To: <milsurplus at mailman.qth.net>; <boatanchors at mailman.qth.net>; 
<arc5 at mailman.qth.net>
Sent: Tuesday, May 17, 2011 6:45 AM
Subject: Re: [ARC5] TCS Xtals


>I have several hundred of them (but relatively few in matched pairs and of
> those, relatively few on "useful" frequencies.  But I have never come 
> across
> any mention of how they were stored.  I.e., no evidence of a storage
> container being built for them.
>
> FWIW, first, the TCS doubles and quadruples for Band 2 and Band 3
> respectively.  So if you were to come across a crystal marked 7800 KC 
> transmit, it
> will also work on 3900 and 1950 (the latter being the actual crystal
> frequency).  Second, the holders used are duals, but the same (single) 
> side is used
> for both the receiver and transmitter marked crystals.  So all crystals 
> will
> work in either transmitter or receiver.  The trick is figuring out what
> frequency it will put you on.  An 1800 KC crystal will put you on 1800, 
> 3600 and
> 7200 KC transmit.  Or 2255, 3145, 4055, 6745 and 7655 KC receive. 
> However,
> the standard markings for receive crystals are always with the injection
> signal 455 KC above the operating frequency.  So if you found an 1800 KC
> receive crystal, it would only be marked either 3145 or 6745.
>
> In a message dated 5/16/2011 10:16:56 PM Central Daylight Time,
> w7qho at aol.com writes:
>> All,
>>
>> Bit hesitant here about bringing up "TCS" again following the fuss
>> that developed following the last mention of these radios but let's
>> see what happens. :^)
>>
>> Been seeing and owning these (transmitters and receivers) for years,
>> very popular radios, widely available and produced originally in large
>> numbers.  But, very few of the crystals in their large holders which
>> could be optionally used to control the transmitting and receiving
>> frequencies seem to be in evidence.  Have never seen a fully populated
>> set, transmitter or receiver, and rarely any set with any crystals
>> installed at all.  Don't see them at 'fests or on eBay. What's the
>> story here?  Were there sets of crystals produced for these radios,
>> boxed with separate drawers for transmit and receive units like with
>> the BC-669 for example?  Or, was xtal control found to be unnecessary/
>> undesirable in practice?  Or what?  Anyone know more?
>>
>> Dennis D.  W7QHO
>> Glendale, CA
>>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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