[BC] FM Translator Co-location question

[Dana Puopolo]

It cracks me up how a 250 watt translator can sit on the same tower as a full
power on a second adjacent without interference, while a 100 watt LPFM or Non
com WOULD interfere!
It must be "FCC Physics" at work!
You all have heard of FCC Physics haven't you? It's one part REAL physics
mixed with three parts politics and two parts lobbying.

-D

From: towers at mre.com

However, this doesn't address any IM generated by the existing full class
station. It too will likely need some sort of assistance in the form of a
lossy isolator.  Which may or may not introduce more loss than the TX can
make up in the long run.

MM

> A few ideas:
>
> 1)  You might be able to reduce the IM enough to meet FCC limits by
> installing an isolator at the translator output.  EMR supplies these
> for the 88-108 band in the 100 watt range and I've used them
> successfully on translators collocated with full power stations:
>
> http://www.emrcorp.com/catalog/111/272/pdf/IM%20Products.pdf
>
> 2)  As Mike mentioned, a translator antenna with half-wave spaced bays
> will minimize coupling to/from other antennas mounted higher or lower
> on the same tower.
>
> 3)  If the translator antenna is vertically polarized only, this
> should also help to avoid interaction with other antennas above or
> below it.
>
> Mark
>