Topband: Fwd: CGC #580

[Tom Frenaye]

Thought the following excerpt might be of use when tracking down which local AM broadcast station you may need to notch out in order to hear well on 160m...
                        -- Tom

>------------------------------------------------------------------
>
>                      THE CGC COMMUNICATOR
>                            CGC #580
>                     Tuesday, June 24, 2003
>                            ________
>               Robert F. Gonsett, W6VR, Publisher
>                       <rgonsett at ieee.org>
>           Stephen H. Blodgett, W7RNA, Letters Editor
>                  mailto:steve at earthsignals.com
>    Copyright 2003, Communications General® Corporation (CGC)
>------------------------------------------------------------------
>
>  DETERMINE AM & FM SIGNAL STRENGTHS AT SPECIFIC ZIP CODES
>
>  A free service from V-Soft Communications lets you determine
>which AM & FM radio signals should be receivable at a given zip
>code; not only that, but the program ranks the stations by field
>strength and lists the strengths.  Directional antenna patterns
>are taken into account during the calculation process.
>
>  According to Doug Vernier, the AM tool was added to their
>existing FM-only prediction service after a year-long effort,
>and the company went to great lengths to make the predicted field
>strengths as accurate as possible.  Note that only daytime AM
>groundwave signals are computed.
>
>  Let's try a sample calculation.  Visit the URL at the bottom
>of this story and input the zip code 91602 (N. Hollywood, CA).
>Note that KKBT(FM) outperforms KPFK and KBIG.  How could a
>relatively low powered Mt. Wilson station be stronger than the
>big guns at the same site?  Simple.  The FCC CDBS database, used
>by V-Soft's program, thinks KKBT is on Briarcrest instead of Mt.
>Wilson!
>
>  If you find other CDBS errors, let the FCC know.  Your station
>is not receiving full protection if its parameters are listed
>incorrectly.  Hopefully the KKBT error will be fixed soon.
>
>  http://www.v-soft.com/ZipSignal/default.asp
>
>------------------------------------------------------------------
>
>  The CGC Communicator is published for broadcast engineering
>  professionals in so. California by Communications General®
>  Corporation (CGC), consulting radio engineers, Fallbrook, CA.
>
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e-mail: frenaye at pcnet.com    YCCC --> http://www.yccc.org/
Tom Frenaye, K1KI, P O Box J, West Suffield CT 06093 Phone: 860-668-5444