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GE Phoenix odd-ball CG tone.

Joined
Aug 1, 2018
Messages
17
Location
Santee, CA.
Anybody familiar with GE Phoenix know how to force in an odd-ball CG tone? It It's a Phoenix SX UHF. I'm using the GE/Panasonic suitcase programmer.
 

Reelfishguy

Member
Feed Provider
Joined
May 30, 2011
Messages
48
I don’t think you can change it to a custom tone. Many years ago I built a stand alone programmer for the Xicor 2212 EEPROMs. Each address coincided with a pre-defined RF frequency and tone that was sent to the microprocessor. I had a thick book from GE that listed the EEPROM address for each frequency. Thank good for PC programming.
 

lenk911

Member
Joined
Feb 24, 2007
Messages
6
Location
St Paul, MN
Yeah looks like I gotta use tones 210.7 and below. I think some real old stuff only goes up to 203.5.
The CTCSS tones are from an EIA standard from the late 1940's. Each was 3.5% apart to compensate for the old reed and solid state filter designs. The top tone was 192.8. Due to the roll-off filtering in the radio, tones above that would leak trough. The mess started when filtering became better, off standard tones creeped upward. The next logical tone was 199.6 which was a no-no because the harmonics of 50 HZ power supplies would trip the decoders. GE started to use 203.5 which was off standard and called it M1 requiring Motorola to have a special PL reed. Motorola started to use 206.5 and EMS systems started to use 210.7. 206.5 was also an SP for early GE radios! Bottom line it played havoc with synthesizer design and programming especially in the Phoenix. Good Luck.
 

EWC_BDN

Member
Joined
Apr 25, 2017
Messages
47
Location
Brandon MB
That's very cute. The two big public safety radio suppliers trying to make their stuff not compatible with each other since the 1980s nice. I didn't realize this was a thing older than PC programming, or IBM compatible programming as it was probably called.
 
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