Recently our Fire District setup a UHF repeater and a Low Band repeater and patched them together in a crossband setup. When they setup the district's crossband they decided to change the PL tones so they wouldn't be the same on the UHF and Low Band frequencies. What would be the reasoning for doing this?
My town's FD has a crossband setup as well. The system is not physically patched together, it is wireless. But we do have the same PL on the low band and UHF radios.
Is this a problem?
Thanks,
David
Crossband Repeater
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chpalmer
- Posts: 105
- Joined: Mon Jun 17, 2002 9:01 pm
- What radios do you own?: Astro Specta, MT1500, HT1550LS
Re: Crossband Repeater
Couple of different reasons...
Co channel user on same pl that occasionally gets in when conditions are right...
this one would be bad- intermod product of one of the bands causing the other band to "lock open" the system...
Someone programmed a whole lot of mobiles wrong and one stop at the repeater can fix it...
multiples of 60hz are generally avoided as tones due to the problems that can happen with say power supply issues. They may have wanted to change away from that... For a long time the grid was closer to 59 Hz so 118 was easily fooled in some cases.
Ever heard what a bad Winegard amplifier mentioned on my sig line can do to a 60 Hz hum on its power source?
Ok so more than a couple... Have you asked them?
Co channel user on same pl that occasionally gets in when conditions are right...
this one would be bad- intermod product of one of the bands causing the other band to "lock open" the system...
Someone programmed a whole lot of mobiles wrong and one stop at the repeater can fix it...
multiples of 60hz are generally avoided as tones due to the problems that can happen with say power supply issues. They may have wanted to change away from that... For a long time the grid was closer to 59 Hz so 118 was easily fooled in some cases.
Ever heard what a bad Winegard amplifier mentioned on my sig line can do to a 60 Hz hum on its power source?
Ok so more than a couple... Have you asked them?