[BC] IBOC seperate antenna question

[Mike Gideon]

The HAAT of the aux antenna has to be at least 70% of the main. The aux 
antenna must be licensed. You will have to get an STA for IBOC operation.

AFIK, you can't do space combined when the main is directional. The good 
news... high level combining, inefficient as it is, plays real well. Low 
level combining is a good option if your TPO is less than 7kw or so.

The majority of my installs so far have been high level, even though I tried 
to avoid it when I could. The jury is still out in outdoor dump loads. I 
have six in service, so I'll know pretty soon.


----- Original Message ----- 
From: "Tom Bosscher" <tom at bosscher.org>
To: "Broadcast Radio Mailing List" <broadcast at radiolists.net>
Sent: Tuesday, July 12, 2005 3:06 PM
Subject: [BC] IBOC seperate antenna question


> Under the FCC rules, or sta's, is there not a percentage of height above 
> average terrain an FM station must have to be able to use an auxiliary 
> antenna for FM IBOC use? (Simplest way, no combiners, but I thought the 
> antenna had to be "X" % of the main antenna).
>
> Also, what about a station that is directional with the main antenna. They 
> have an aux antenna right around 80% of the HAAT of the directional, but 
> it is non-directional. Is is licensed for a much lower power use for the 
> analog of course. Can they use this antenna for IBOC? I am thinking of 
> saying no, as the contours would not follow each other on this one.
>
>
> Inquiring mind desires proper answers
>
> tom bosscher
>
> p.s., for extra credit, is there a way to see any STA'a a station has on 
> the FCC website?
>
>
>
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