[Boatanchors] Need Xtal Frequency Conversion Formula

[eldim at att.net]

Hello Duanne,
To determine the formula for Xtal Freq to Opr Freq would require which frequency scheme is involved for a particular piece of radio equipment. Every equipment manual worht its salt will have the formulas to determining Crystal Frequency or also some  will have the Xtal to Operating Freq formula.  The Type Crystal, Cut, Overtone, etc is a determining factor on what circuit parameters are involved to make it funtion at its optimum level.  The CR Type is very handy.  I know that Collins Radio has several crystals in the 8 Mhz region. I'm not certain but I thought that there were of the CR-18A or CR-24A types. Doon't hold me to this.  What other information is on the Crystal?

73,
Glen Galati, KA7BOJ
Tacoma, WA

-------------- Original message from "Duane B. Fischer, W8DBF" <dfischer at usol.com>: -------------- 


> 
> 
> Hi All, 
> 
> Can one of you please give me the formula to convert the frequency on a HF 
> crystal to its counterpart in 'actual' listener MHZ? Such as, a crystal from ICM 
> has 8.5 written on the top of it. What does this equal in actual listening MHZ? 
> For instance, I know that 11.5-12.0 MHZ is shown on the crystal as 18 MHZ. Is 
> there a formula to convert that 18.0 or how does the listener know it equals 
> 11.5-12.0 MHZ on the receiver dial? 
> 
> I have the formula for VHF and UHF, but nothing for HF. Thank you very much. 
> 
> Duane W8DBF 
> 
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