What about building a notch circuit tuned to 600 kHz? And then put
one each on both TX and RX?
On Tue, 21 Dec 2004 20:06:10 -0800, Neil McKie <[EMAIL PROTECTED]> wrote:
>
>
> A new VHF paging system just was installed near here in the
> last few weeks.
>
> Rich wrote:
> >
> > 155.820
> > BEND, CITY OF WNNU934
> > 100 watts Overturf Butte (Bend)
> > 100 watts Awbrey Butte (Bend)
> > 300 watts Wampus Butte (La Pine)
> > 300 watts Gray Butte (Madras)
>
> VHF paging is apparently here to stay - whether we like it or not.
>
> Neil - WA6KLA
>
>
> Dan Hancock wrote:
> >
> > We had exactly the same problem in Ann Arbor. The
> > pagers were exactly 600 kz apart and up in the 158 Mhz
> > segment. We installed notch filters and sharp
> > band-pass filters on the repeater with some success.
> > Nothing kept it our entirely. I was about to try a
> > crystal filter on the front end when the interference
> > just ended. One of the transmitters was taken off the
> > air. Note though in our situation, the pagers were
> > there first.
> >
> > I can't imagine in this day and age, with the death of
> > VHF paging being on the near horizon, why anyone would
> > put up a NEW VHF paging transmitter. However,if one of
> > these pager transmitters is indeed a new installation,
> > it may be possible to force them off the air. I can't
> > quote the section, but the FCC told me one time in a
> > different interference situation that a new or changed
> > transmitter operation it totally responsible for
> > solving interference related to their transmitter
> > within 5 miles of their transmitter, even if their
> > transmitter meets specs. This rule might possibly just
> > apply in this situation. They have installed a new
> > operation that produces an uncurable mix that wipes
> > out your operation. That mix could be occurring in
> > your transmitter, your receiver, one of the paging
> > transmitters, someone else's transmitter, etc, etc,
> > etc. I would suggest that you immediately contact your
> > nearest FCC field office and discuss this with them. I
> > wish I could give you the section, but the engineer
> > who told me about it never actually quoted the
> > section.
> >
> > Good luck.
> >
> > Dan Hancock N8DJP
> > President, RADAR Inc.
> > www.qsl.net/wr8dar
> >
>
> Yahoo! Groups Links
>
>
>
>
>
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