nmfire10 said:If there are others on the frequency within any reasonable distance (0-100 Miles maybe), then some homework should be done to make sure you have DIFFERENT PL tones. You might not hear them on the ground but 300' up on a tower, it might come in weak but enough to break squelch. You don't want to randomly pick the same PL as the other users.
Other than that, you can pick whatever PL or DPL you want. I'm a fan of DPL due of the turn-off code being universal. PL has a different reverse-burst for different manufactueres.
N_Jay said:nmfire10 said:If there are others on the frequency within any reasonable distance (0-100 Miles maybe), then some homework should be done to make sure you have DIFFERENT PL tones. You might not hear them on the ground but 300' up on a tower, it might come in weak but enough to break squelch. You don't want to randomly pick the same PL as the other users.
Other than that, you can pick whatever PL or DPL you want. I'm a fan of DPL due of the turn-off code being universal. PL has a different reverse-burst for different manufactueres.
CTCSS has a stadardized "reverse burst", some manufactures just implement it poorly.
Voyager said:N_Jay said:nmfire10 said:If there are others on the frequency within any reasonable distance (0-100 Miles maybe), then some homework should be done to make sure you have DIFFERENT PL tones. You might not hear them on the ground but 300' up on a tower, it might come in weak but enough to break squelch. You don't want to randomly pick the same PL as the other users.
Other than that, you can pick whatever PL or DPL you want. I'm a fan of DPL due of the turn-off code being universal. PL has a different reverse-burst for different manufactueres.
CTCSS has a stadardized "reverse burst", some manufactures just implement it poorly.
No, there ARE different specs for the RB. Some use 180 degrees phase shift - others use 120 degrees. The duration is different, too.
Joe M.
N_Jay said:Voyager said:N_Jay said:nmfire10 said:If there are others on the frequency within any reasonable distance (0-100 Miles maybe), then some homework should be done to make sure you have DIFFERENT PL tones. You might not hear them on the ground but 300' up on a tower, it might come in weak but enough to break squelch. You don't want to randomly pick the same PL as the other users.
Other than that, you can pick whatever PL or DPL you want. I'm a fan of DPL due of the turn-off code being universal. PL has a different reverse-burst for different manufactueres.
CTCSS has a stadardized "reverse burst", some manufactures just implement it poorly.
No, there ARE different specs for the RB. Some use 180 degrees phase shift - others use 120 degrees. The duration is different, too.
Joe M.
I would have to do some digging, but I thought the EIA/TIA standardized it.
N_Jay said:1. EIA-220-A
Minimum Standard for Land Mobile Communications Continuous Tone-Controlled Squelch Systems (CTCSS) (superceded by EIA-220-B) Mar. 1979
2. EIA-220-B
Minimum Standard for Land Mobile Communications Continuous Tone-Controlled Squelch Systems (CTCSS) (withdrawn May, 1994)
Voyager said:N_Jay said:1. EIA-220-A
Minimum Standard for Land Mobile Communications Continuous Tone-Controlled Squelch Systems (CTCSS) (superceded by EIA-220-B) Mar. 1979
2. EIA-220-B
Minimum Standard for Land Mobile Communications Continuous Tone-Controlled Squelch Systems (CTCSS) (withdrawn May, 1994)
OK, so there was a standard for a time, but no longer?
Joe M.
