Re: [MV] Short RT 524 whips

Glen,

Do you have a web site or some other place where pictures of this
type of antenna can be seen.

I have tried the web site for [url]http://www.antenna.com/[/url]

There is no section on military antenna's, but that could be that they
just don't advertise that part of their business.

Could also be that I'm looking in the wrong part of the forest.

Thanks.

Jim Wiehe VA3JHW
[email]j.wiehe@sympatico.ca[/email]
----- Original Message -----
From: "Glenn Shaw" <mpmutt@mtaofnj.us>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Wednesday, August 04, 2004 10:23 AM
Subject: Re: [MV] Short RT 524 whips

[color=blue]
> Hi
> Going over my email this morning and noticed all the comments about the
> shorter MX-6707 antenna masts. I can clear all this up since the 2
> M151's that they were on belong to myself and my good friend Jim Smith.
>
> The normal antenna used is a 2 piece coaxial design with the broadband
> LC MX6707 tuner at the base. Although the complete unit is designed to
> run from about 30-88 Mhz in fact is more efficient at certain freqs than
> others. The tuner provides enough of a match to the RF finals to keep
> them happy over the range. Sincgars antennas look similar and are also
> a broadband coaxial design 2 piece antenna with a fixed circuit LC
> tuner.
>
> This is of course with the exception of the Sincgars Blast resistant
> short antenna which runs a stainless steel whip and is supplementally
> used as a second antenna for armor and Tow vehicles which have severe
> shock and missile exhaust issues that are detrimental to composite
> antennas at times. We run one of these on our Humvee's Sincgars system
> which was also displayed at Weare NH. The short antenna must be used on
> a vehicle or surface that provides some gound plane counterpoise for the
> antenna, unlike the composite coaxial 2 piece design.
>
> The radios in the 2 jeeps are NOT display only and are used frequently
> on the NG mil nets. They are fully functional. The antennas are a
> specially produced item by AS (Antenna Specialists) who make most of the
> Govt contract antennas.
>
> They are VERY rare and are designed just as the later short Sincgars
> armor antenna to work with a vehicle that provides a ground plane.
> Although they are very convenient and were tested by the US Army Natick
> Labs for use on special purpose vehicles I don't know where you could
> find more of them. They can be reproduced. They are designed to work
> with the MX-6707 mechanical/electrical tuner unit in the lowest L/C
> (highest freq) position with the motor cable disconnected from the RT
> unit. In this setting they tune very well over the 38-40 Mhz tactical
> VHF freqs. When measured with the Bird 43 and IFR monitor they have a
> lower reflected power and more forward power than the standard 2 piece
> setup. The drawback of course is the narrower bandwidth and lower
> height of the active element. They are nice, though since you don't
> have to tie them down and they are not hitting everything. They were
> originally on mil police vehicles when found years back before the
> Sincgars systems came out.
>
> Hope that helps out;
>
> Glenn
> M1043A1
> M151A2
> M1009
> M1101[/color]


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