I don't know about the present, at one time in the Dallas -
Ft. Worth Texas area, there were two FM broad cast stations 5 MHz
apart ... apparently the amateur community was using a 5.2 MHz
spread on the 440 MHz band.
If someone in Texas could bring this up to date ...
Neil - WA6KLA
Al Wolfe wrote:
>
> Ken,
> This can happen when any two transmitters are transmitting at the
> same time, 600 khz apart. I've seen it happen to 2 meter repeaters
> when two uhf transmitters 600 khz apart are transmitting nearby
> when the 2 meter system was up. I've seen it happen near two AM
> broadcast stations 600 khz apart.
> That's primarily why in Illinois the six meter repeaters don't use
> one mhz spacing as there is a high power AM station in Chicago on
> one mhz.
> There doesn't need to be any simple harmonic relationship between
> any of the frequencies involved. I've been told by the experts that
> this is imposible, that they must be related, but have seen too many
> first-hand examples that would prove otherwise.
> Cirulators and isolators can help if installed properly but any
> rusty or loose bolt or dissimilar metal joint near any of the
> antennas can cause the problem. It's avery tough situation to deal
> with, however, as others have said, VHF paging is slowly going away
>
> Good luck,
> Al, K9SI
>
> Date: Tue, 21 Dec 2004 04:35:35 -0000
> From: "kc4ih" <[EMAIL PROTECTED]>
> Subject: HELP: 2 meter repeater intermod problem from pager
> transmitters
>
> We have 146.04/.64 repeater on a nearby mountain top. It worked
> great for years with a range of 100 miles or more. Since the phone
> company and a pager company installed their high power transmitters
> near the site of the repeater (within 100 yards) the repeater is
> virtually useless. After much head scratching I believe that the
> difference in frequency of the pager transmitter of 600 khz is the
> problem but have no idea how to solve the problem without going to
> an odd split. The repeater coordinator for this area of Virginia
> won't even consider that as an option.
>
> <snip>
>
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