From: Glenn Shaw (mpmutt@mtaofnj.us)
Date: Wed Aug 04 2004 - 07:23:48 PDT
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
MVPA
MTANJ
-----Original Message-----
From: Stu [mailto:stuinnh@comcast.net]
Sent: Tuesday, August 03, 2004 1:32 PM
To: Military Vehicles Mailing List
Subject: Re: [MV] Short RT 524 whips
These were for display radio's only.
"Stu"
Southern New Hampshire, USA
"Live Free Or Die"
Military Vehicle Preservation Assoc.
Merrimack Valley Military Vehicle Collectors
Green Mountain Military Vehicle Club
Vehicles:
1967 M151A1 Jeep
1964 M416 1/4 Ton Trailer
1986 M1009 CUCV Blazer
-----Original Message-----
From: Military Vehicles Mailing List [mailto:mil-veh@mil-veh.org] On
Behalf Of chance wolf
Sent: Tuesday, August 03, 2004 1:25 PM
To: Military Vehicles Mailing List
Subject: Re: [MV] Short RT 524 whips
----- Original Message -----
From: "Scott Christ" <m151a168@yahoo.com>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Tuesday, August 03, 2004 10:04 AM
Subject: Re: [MV] Short RT 524 whips
> Afternoon Chance: When I first saw the post I thought
> maybe it was the top section being used on the AB-15
> but Stu said it was one piece bottom being used on a
> 6707 base. If I remember aren't there one piece
> SINCGAR Antennas that are one piece and the base looks
> like a 6707 O&O Scott
> --- chance wolf <chance_wolf@shaw.ca> wrote:
I've got some of the AS-3900/3900A bases at work along with a selection
of the SINCGARS whips for them, and while they're shorter than their
MX-6707 base cousins, they're still the two piece type. That's not to
say a single-component SINCGARS mast doesn't exist - only that I've yet
to come across one.
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