You will find less and less narrow band cavities on paging transmitters
lately. As the paging industry slowly goes into their death spiral of
loosing customers, they no longer need 2, 4 or more transmitters at each
site to deal with the capacity of pagers out there. What some companies
are doing is leaving one transmitter at the site and doing
multi-frequencies out of a single transmitter (This is assuming they were
all on the same band, 900Mhz for example.) When they multi-frequency a
transmitter they need to remove any narrow band filters off the transmitter
output. This may explain why some ham repeater sites that were quiet now
have noise problems. The irony of it is that you see paging transmitters
leaving a site and think that the noise floor is going to go down, only to
find that the nose increases tenfold.
73, Joe, K1ike
At 09:53 AM 12/21/2004, you wrote:
>All paging transmitters involved should have narrow bandpass cavities
>and circulators on their outputs. That's usually considered a must at
>any site. If the paging company isn't willing to spend the money for
>that, then they aren't to serious about staying in business.
>The good news is that VHF common carrier paging is slowly going away,
>and the remaining frequencies will likely be dropped and released back
>into the general pool in a few years, or less.
>There is virtually no VHF paging here in NE Ohio anymore.
>--
>Jim Barbour
>WD8CHL
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