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HOW TO IDENTIFY MONITOR CRYSTALS

The guide below will assist you in identifying the various types of scanner
crystals.  While most scanners use standard 10.7 I.F. crystals, you may find
that what you originally thought to be the correct crystal for your scanner
will not work because the crystal is a different I.F. than the scanner uses.

BEARCAT SCANNER CRYSTAL IDENTIFICATION (10.8 I.F.):
A-135     MCS-2     A-135-2   C9-86     RCD-2      BCM      BCL     BCH
BC-E      BCT       JK-5      ECS-2     JK-5BCL    JK-5BCU  JK-5BCH 
10.8 CCI  ELECT-3   BC3       BRMU

REGENCY SCANNER CRYSTAL IDENTIFICATION (10.7 I.F.):
ECS-1     RCD-1     MRH-1     TMR       TN-1       PEI      JK-1TMR 
ECSU-1    ECSH-1    ECSL-1    10.7 CCI  MCS-1      MRL-1    MRU-1
TC-L17    BOMAR A-4 JK        MRH6      302-500    T417

TO FIGURE ACTUAL CRYSTAL FREQUENCY:
            
LOW BAND =  LISTENING FREQUENCY + RADIO I.F. (10.7 OR 10.8) 

HIGH BAND =  LISTENING FREQUENCY - RADIO I.F. (10.7 OR 10.8)
                             Then Divide by 3

UHF BAND =  LISTENING FREQUENCY - RADIO I.F. (10.7 OR 10.8)
                             Then Divide by 9


In an earlier listing there was confusion on the frequency charts to use Bearcat 
crystals in Regency Scanners and Regency crystals in Bearcat Scanners.

Here is a simple example:
Low Band:...  A Bearcat crystal receives on 46.120 mhz.  The actual crystal
 frequency of this particular crystal is 56.920 mhz (Receive Frequency + 10.8 I.F.). 
If this crystal were to be used in a Regency Scanner, the crystal would receive 
46.220 mhz (56.920 - 10.7 I.F.)

High Band... A Regency crystal receives on 154.875 mhz.  The actual crystal 
frequency of this particular crystal is 48.0583 mhz (Receive Frequency - 10.7 
then divide by 3).  If this crystal were to be used in a Bearcat scanner, the crystal
would receive 154.975 mhz. (Actual frequency * 3 plus 10.7)

Similar calculations can be used for UHF Bands.


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