[BC] Air-Dielectric Sections

[Chuck Lakaytis]

Yep, we are going to have to install some phase rotation correction in all 
of our nine AM's before we turn on HD.

Chuck Lakaytis
Director of Engineering
Alaska Public Broadcasting, Inc.
135 Cordova Street
Anchorage, AK 99501
907 277 6300
907 277 6359 FAX
907 301 4339 Cell
----- Original Message ----- 
From: "Mike McCarthy" <Towers at mre.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Friday, March 09, 2007 4:30 PM
Subject: Re: [BC] Air-Dielectric Sections


> In today's age of absolute phase rotation presented to the transmitter 
> being important for best broadband operation, treat the cable as you would 
> in a DA and factor it in the design of the whole plant....DA or N-DA.
>
> MM
>
> At 08:14 AM 3/9/2007 -0600, Gary Glaenzer wrote
>>Andrew;
>>
>>If it's a non-DA, there will be no 'phasor' as such, just an ATU at the
>>antenna end.
>>
>>So 'velocity factor'  would not be a problem; even if it was different 
>>from
>>3" to 4", which I'm not sure it would be.
>>
>>I'd bury it deeper than 3', unless you are in the South, and pulling 3"
>>Heliax thru 6" conduit over 750 feet will be a cast-iron SOB.
>>
>>The advice on fiber duct has been educational, and I'd look into it if I
>>were you.
>>
>>Gary
>
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