Difference between revisions of "Scanner Crystals"
From The RadioReference Wiki
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− | ==Crystal Formulas== | + | ==Bearcat Crystal Formulas== |
− | |||
− | |||
− | Radio Shack & Regency | + | ===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== | ==Crystal Markings== |
Revision as of 21:17, 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