[ARC5] Fw: TCS Xtals

[Henry Mei'l's]

----- Original Message ----- 
From: "Henry Mei'l's" <meils at get2net.dk>
To: <WA5CAB at cs.com>
Sent: Tuesday, May 17, 2011 8:21 PM
Subject: Re: [ARC5] TCS Xtals


> I could send a jpg foto of my TCS xtal to show its internally adjustable 
> pressure screw.
> The screw pressure would have to have been set before the top housing 
> section was attached -- the screw is not accessible otherwise.
   As I wrote, I got my unit > minus the top housing
> section and there appear to be traces of a glue/adhesive material on the 
> top edges. (A  screw access-hole could be drilled thru the metal label and 
> bakelite
   housing -- or the top section cud be removed to access the screw
> of the xtal container walls if pressure adjustment would ever be needed.If 
> I recall
   correctly, pressure adjustment capability was a common feature in earlier 
xtal
   productions. Think I saw that in B&W  xtal ads in pre WWII ARRL 
handbooks.
   I would guess that my missing top section had a label indicating that the 
unit
> was a receiver xtal, (even though that fact is deductable from the 1727.5 
> KC xtal freq. > contra the 3000 KC "OUTPUT FREQ." -- tagging as 
> transmitter or reciever xtal  would be the most operator-friendly  thing 
> to do.
>
> Henry, oz3o n2nr
>
> ----- Original Message ----- 
> From: <WA5CAB at cs.com>
> To: <arc5 at mailman.qth.net>
> Sent: Tuesday, May 17, 2011 7:03 PM
> Subject: Re: [ARC5] TCS Xtals
>
>
>> OK.  I've never seen the hardware (database says it is AKA HT-12) but do
>> supposedly have one of TM 11-244 on SCR-281-A, -B & -D.
>>
>> In a message dated 5/17/2011 11:52:19 AM Central Daylight Time,
>> kk5f at earthlink.net writes:
>>> Robert wrote:
>>>
>>> >I'm not familiar with the BC-411.
>>>
>>> I believe that "BC-441" was the intended citation, part of SCR-281.
>>>
>>> FWIW, I've got about 30 TCS receiver and transmitter crystals. Every one
>>> clearly indicates that it is a receiver or a transmitter crystal. None
>>> have
>>> an external pressure screw.
>>>
>>> The AN/ARC-9 (Bendix RTA-1B) uses a dual crystal unit.  All units came
>>> from the factory with a standard set of ten frequencies installed.  I'll
>>> have to look closer at my MO-1 to see if it uses a dual crystal unit. 
>>> If
>>> it does, I don't have any.
>>>
>>> Mike / KK5F
>>>
>>
>> Robert Downs - Houston
>> wa5cab dot com (Web Store)
>> MVPA 9480
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