[Collins] WARC XTALS for KWM-2A

[Dave Brown]

 I'm reminded by these posts that there was a Colins S-line etc crystal 
replacement synthesiser article quite some years ago in Ham Radio- has this 
idea ever been updated? IIRC that article used basic 7400 series TTL-I'd 
expect there's a 'better mousetrap' around these days....
 73
 Dave, ZL3FJ


----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at weather.net>
To: <collins at mailman.qth.net>
Sent: Thursday, August 02, 2012 1:22 AM
Subject: Re: [Collins] WARC XTALS for KWM-2A


> Among the custom crystal makers, ICM has been one of the most reliable.
> In the last 50 years, every crystal I've bought from ICM has been on
> frequency and the frequency ordered, but only about 60% of crystals from
> Texas Crystals has been right. There are other makers out there,
> Petersen Crystal in Council Bluffs caters mostly to hams if they are
> still in business.
>
> Making the wire mounted and plated crystals in the sealed enclosers is a
> whole lot more machinery intensive than grinding surplus FT-243 crystals
> to a new frequency.
>
> Surplus Sales of Nebraska had a number of Collins crystals but has
> thinned their collection, but may be worth looking. WARC bands are
> unlikely to be found in any surplus collection.
>
> Dan's Small Parts and Kits has a wide collection of crystals, probably
> none on a Collins standard frequency.
>
> Below 12 MHz the receive band lower edge is 3.155 MHz lower than the
> crystal frequency. Above 12 MHz the receive band lower edge is 3.155 MHz
> lower than twice the crystal frequency. Factory crystals vary in
> frequency from 6.555 MHz to 16.4775 MHz for 3.4 to 30 MHz. There is a
> complete table in EVERY S-line and KWM-2 manual.
>
> 73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association.
>
> On 8/1/2012 12:47 AM, appo2 at juno.com wrote:
>> Just for a curiosity,,,,International Xtal is the only one left over in
>> this industry?
>> I am asking because I have tons of 75s3cs and kwm2as without Xtals,but I
>> figured to re xtal them cost me more than radios.There used to be many
>> indivisuals selling xtals from home for $5.Looks they are all gone.I
>> guess because of nobody sells them blanks anymore.
>> somebody was asking for 17.5mhz for 51s1,,,this is the standard Marine
>> frequency 157.5Mhz TX,I have several of them,,pulled out of old radios.
>> likewise,,u can get many xtals for nothing if u have a calculator
>> handy,or a test
>> oscillator and freq counter.
>> K7FT
>>
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