On Mon, 24 Jun 2013 09:15:46 -0700, Jeff Liebermann
wrote:

-- Overall height: 14.25 inches
-- 4 inches from the base the antenna is wound into a coil, about 3/8
inch diameter, 5 turns
-- the coil is 1.75 inches long
-- above the coil is 8.5 inches of antenna
-- NMO base

Like this perhaps?
http://www.11junk.com/jeffl/antennas/Misc/slides/Motorola-850mhz-NMO.html
That's an 850 Mhz 5/8 wave antenna, commonly sold by Motorola for
trunking systems.

The antenna in the photo was made by Maxrad (PcTel). I have others
that appear identical from Antennex (Laird). I couldn't find a
similar antenna in either online catalog. The one's supplied by
Motorola use a heavier gauge wire which I guess(tm) were Antenna
Specialists (PcTel) like this:
http://www.ebay.com/itm/321096706872

This is the closest equivalent that I could find:
http://www.antenna.com/artifacts/2012511BASELOADEDNOGROUNDPLANEANTENNAS.pdf

I would advise against using this antenna for 152 Mhz and suggest you
get a real 1/4 wave or 5/8 wave antenna.




--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Kickin' Ass and Takin' Names posted for all of
us...

And I know how to SNIP


It's a long story, here's the short version.

Our volunteer rescue squad dispatch operates in the 152 - 154 MHz
range -- transmit on 154.XXX, receive 152.XXX.

Our main antenna barely survived contact with a tree limb and needs to
be replaced.

Our local Motorola sales rep has his head stuck firmly up his ass and
keeps trying to sell us some basic 1/4-wave verticals.

The current antenna is a vertical whip with a loading coil wound
along the length of the antenna.

The dimensions a

-- Overall height: 14.25 inches
-- 4 inches from the base the antenna is wound into a coil, about 3/8
inch diameter, 5 turns
-- the coil is 1.75 inches long
-- above the coil is 8.5 inches of antenna
-- NMO base

I suspect this antenna is an old model 5/8-wave VHF antenna, shortened
by winding a coil in the antenna.

If it is a 5.8-wave, it should be giving us a few dB gain. The
1/4-wave whip he wants me to install would give unity or less gain. In
our rural area, we need all the antenna help we can get. I an
thinking about installing a full-length 5/8-wave whip, but, we go into
a lot of driveways with low tree limbs and I doubt a full-length
antenna would survive very long.


I have Googled every term I can think of to find this antenna,
Motorola sales rep tells me he thinks its a "cellular antenna" . .
.which it clearly is not. My MFJ antenna analyzer shows a resonance
at 154 MHz.

Anyone help me identify this antenna?

look at Larsen antennas I believe they made many
antennas for Moneyrola.


--
Tekkie

"Kickin' Ass and Takin' Names" wrote in message
...


It's a long story, here's the short version.

Our volunteer rescue squad dispatch operates in the 152 - 154 MHz
range -- transmit on 154.XXX, receive 152.XXX.

SNIP

I have Googled every term I can think of to find this antenna,
Motorola sales rep tells me he thinks its a "cellular antenna" . .
.which it clearly is not. My MFJ antenna analyzer shows a resonance
at 154 MHz.

Anyone help me identify this antenna?


- - - - -

Fat, Dumb, and Ugly
is no way to go through life.

But, if you're a
Republican,
you have no choice.


When you're asking people for help, an insulting sig cuts down the number of
people who care about your problems.