Xref: utzoo rec.ham-radio:3878 sci.electronics:2081
Path: utzoo!mnetor!uunet!portal!cup.portal.com!Oliver
From: Oliver@cup.portal.com
Newsgroups: rec.ham-radio,sci.electronics
Subject: Re: Use a VLF rcvr to decode TV's secondary audio programming
Message-ID: <3054@cup.portal.com>
Date: 9 Feb 88 05:57:19 GMT
References: <2547@ihuxz.ATT.COM>
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There is another subcarrier above the SAP called the professional
channel....This is used to communicate data and voice to and from field
units withen the range of there transmition range.

Don't know the frequency right off...but if you want more info mail me and
I'll bet fer ya!