[Scanner] "Waterfowl" antennas

[DW White]

No argument there Mike.  Personally, I tend to be addicted to 1/2 wave 
antennas, due to there being no need for a ground plane.  Only problem there 
is 6M Ham/VHF-Lo public service.  A bit unwieldy for an HT, hi hi.

My first experience with 800 has been only the past few months, as Redding, 
CA PD is 800 trunked.  Also, has caused agency co-operation problems, as 
everyone else in the area is VHF-Hi, except CHP, who are VHF-lo.

Nice to get into an intelligent discussion.

73, DW, KE6WYB, Shasta County California, CM80 <><


----Original Message Follows----
From: "Mike Urich" <ka5cvh@arrl.net>
Reply-To: scanner@mailman.qth.net
To: <scanner@mailman.qth.net>
Subject: Re: [Scanner] "Waterfowl" antennas
Date: Sun, 16 Jun 2002 07:18:11 -0500

From: "DW White" <ke6wyb@hotmail.com>

 > Based on those I've seen, the antenna supplied with most scanners are
 > resonant at approximately 153 Megahertz.
 >
 > Two reasons.
 > 1.  Cost.  Why pay to re-engineer something that's "always worked" if 
it's
 > not costing sales??
 >
 > 2.  In my experience, there is still a lot of public service on VHF-Hi.
 > Also NOAA weather and Aircraft.

Mike wrote

All true plus let me add a P.S. ... if you take the third harmonic of 153mHz
you have 459mhz making this antenna fairly resonant in both the VHF-hi and
UHF bands.   Kinda like using a 40 meter dipole on 15 meters.  Unfortunately
the 5th harmonic is 765 mHz and the 7th is 1071 mHz giving it a null across
the 800-900 mHz portion.  Now a second harmonic from a 440 mHz antenna is
still somewhat usable for 800-900... the 6th from a 153 (918 mHz) I would
have my doubts.

Mike Urich,   KA5CVH
www.ka5cvh.com
LaPorte TX   EL-29

Amateur Radio *IS* a contact sport!
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