Difference between revisions of "Scanner Crystals"
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Revision as of 17:03, 6 January 2016
Contents
Bearcat Crystal Formulas
Bearcat Low-band
- Third Overtone
- Receive frequency + 10.8 MHz = crystal frequency
- HC25/u holder
Bearcat High-band
- Third Overtone
- Receive frequency - 10.8 MHz / 3 = crystal frequency
- HC25/u holder
Bearcat UHF-band
- Third Overtone
- Channel frequency - 10.8 MHz / 9 = crystal frequency
- HC25/u holder
Regency/Radio Shack (Realistic) Crystal Formulas
Regency & Radio Shack (10.7 MHz IF) Low Band
- Third overtone
- Receive frequency + 10.7 MHz = crystal frequency
- Series resonance - 450Hz
- HC25/u holder
Regency & Radio Shack (10.7 MHz IF) High Band
- Third overtone
- Receive frequency - 10.7 MHz / 3 = crystal frequency
- Series resonance - 450Hz
- HC25/u holder
Regency UHF-band
- Third Overtone
- Receive frequency - 10.7 MHz / 9 = crystal frequency
- Load capacitance 18pf
- HC25/u holder
Radio Shack (Realistic) UHF
- Triple conversion
- Receive frequency - 44 MHz / 9 = crystal frequency
Crystal Markings
77 means it was made for a Radio Shack Pro-77 and uses a 10.7 IF.
External Links
Ebay