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Commercial repeaters

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KD0NDO

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May 25, 2009
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337
Location
otsego,mn
Do commercial repeaters usually follow a offset for inputs like amateur radio repeaters do?
If they don't how would you be able to find the input?


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nd5y

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Dec 19, 2002
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8,120
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Wichita Falls, TX
Only on 220 MHz and higher bands.
There are no standard offsets or channel pairs on VHF except for some of the paging channels and the 152/157 MHz business channels that were formerly used only by taxis. On VHF you find the input either by looking up the license or by searching.

220-222 MHz repeaters are -1 MHz offset
406-420 MHz repeaters are +9 MHz offset
450-470 MHz repeaters are +5 MHz offset
470-512 MHz repeaters are +3 MHz offset
764-776 MHz repeaters are +30 MHz offset
851-869 MHz repeaters are -45 MHz offset
935-940 MHz repeaters are -39 MHz offset
 
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talkpair

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Apr 27, 2009
Messages
920
Location
Clinton County, MO
There doesn't seem to be any pattern at all on the VHF high band.

When I first started scanning in the 1970's, I don't recall any repeaters in the VHF high band for public safety. Since the band was already occupied when VHF repeaters became popular, it would have been difficult to establish a standard offset without relocating other users. This would have been a time consuming process at the time, when you consider the radios of that era were crystal controlled and trunk mounted.

Additionally, the band was dotted with different radio services...business, utilities, taxi service etc, that would have made it impossible to establish a standard.

The 450-470 mhz band is pretty much a 5 Mhz split, with the lower frequency of the pair being the transmit side of the repeater.
 
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