[Collins] WARC XTALS for KWM-2A

[Dr. Gerald N. Johnson]

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
>