Help Me Out On This!!!
 

I'm wanting to keep peace within the family.. NO! Extra antennas on the
vehicle..
I want to install a dual band 2m/440 mobile using the AM/FM antenna that is
on the vehicle.. It will be mostly used for receive, BUT....
Other than a duplexer and tuner (s) What is needed to STOP the RF from
damaging the AM/FM radio in case I want to transmit?...
Any help on this??

On Wed, 22 Oct 2003 04:59:09 GMT, "DeG" wrote:

I'm wanting to keep peace within the family.. NO! Extra antennas on the
vehicle..

Sounds like a pretty selfish request to me. Time to fire the
family. Wonder what they would say about an antenna for satellite
radio.

gm
--
Replace x in adr with c

Forget the AM/FM antenna. It might be ok for receive, but I wouldn't risk
trying to transmit on it.

If they're gonna be like that, then maybe a thru-the-glass antenna is the
solution? Looks a lot like a cell antenna and is rather unobtrusive, plus it'll
be less work then trying to hook the radio up to the AM/FM antenna.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
73! de Andy KC2SSB - WPYI880 (GMRS)
Beachwood, NJ USA! Grid FM29vw
http://vhfradiobuff.tripod.com

Bob Miller wrote:

On Wed, 22 Oct 2003 04:59:09 GMT, "DeG" wrote:
I'm wanting to keep peace within the family.. NO! Extra antennas on the
vehicle..

Get a mag-mount dual bander. Throw it in the trunk when not in use.

Throw the XYL in the trunk when the antenna is being used.
--
73, Cecil http://www.qsl.net/w5dxp



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There are disguised antennas used in the land mobile service that look like
AM/FM mobile antennas. (they're intended for undercover police work).
Try http://www.sti-co.com/index.php
Another, simpler, solution that you might get past the XYL is a 'cell look-alike'
antenna. There a number of manufacturers that produce those.
Steve


I'm wanting to keep peace within the family.. NO! Extra antennas on the
vehicle..
I want to install a dual band 2m/440 mobile using the AM/FM antenna that is
on the vehicle.. It will be mostly used for receive, BUT....
Other than a duplexer and tuner (s) What is needed to STOP the RF from
damaging the AM/FM radio in case I want to transmit?...
Any help on this??

"DeG" wrote in message hlink.net...
I'm wanting to keep peace within the family.. NO! Extra antennas on the
vehicle..
I want to install a dual band 2m/440 mobile using the AM/FM antenna that is
on the vehicle.. It will be mostly used for receive, BUT....
Other than a duplexer and tuner (s) What is needed to STOP the RF from
damaging the AM/FM radio in case I want to transmit?...
Any help on this??

Just keeping the RF out of the AM/FM radio isn't too difficult, but
you'll have other issues, too. A diplexer (triplexer?) can be made to
do the job of sorting out the RF, with enough attenuation to prevent
burning up the car radio. -50dB from 10W is 0.1milliwatt, for
example, and it's possible to get better than 50dB attenuation of
unwanted bands. I'm not aware of triplexers specifically for
0.5-108MHz/144-148MHz/440-450MHz, but then I'd just design and build
one anyway (assuming I had decided to do it that way).

I assume your car antenna is a cowl-mounted whip, and not an
on-the-glass one which you might destroy by putting power to it. But
even then, the coax used for car antennas is typically high impedance
(low capacitance) to work well on the AM band. You may have some fun
getting 144 and 440MHz power to the antenna through that stuff, and if
you replaced it with RG-58, the AM reception would suffer quite a bit.
Another possibility is a relay at the antenna feedpoint, but typical
car antennas may not make that very easy.

If I was intent on a "stealth" antenna for my car, for 144 and 440,
I'd consider feeding a window frame as a slot-type antenna. If I was
really rabid about it, I'd think of making a slot antenna in the
sheetmetal, filled with dielectric that could be painted to match the
car finish, but that's a bit extreme for me.

The dual-band mag mount sounds like a good idea to me, or if you don't
need coverage, just a rubber duckie on a handheld.

Cheers,
Tom

Hope he doesn't live in New Jersy...
'Doc

On Wed, 22 Oct 2003 04:59:09 GMT, "DeG" wrote:

I'm wanting to keep peace within the family.. NO! Extra antennas on the
vehicle..
I want to install a dual band 2m/440 mobile using the AM/FM antenna that is
on the vehicle.. It will be mostly used for receive, BUT....
Other than a duplexer and tuner (s) What is needed to STOP the RF from
damaging the AM/FM radio in case I want to transmit?...
Any help on this??


Get a mag-mount dual bander. Throw it in the trunk when not in use.

Or check the mfj site. They have some little clip-on 2m/440 antennas
that attach to your window glass whenever the urge strikes.

Bob
k5qwg

Throw the XYL in the trunk when the antenna is being used.

The best suggestion yet! :)
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
73! de Andy KC2SSB - WPYI880 (GMRS)
Beachwood, NJ USA! Grid FM29vw
http://vhfradiobuff.tripod.com

Hope he doesn't live in New Jersy...
'Doc

It's hard to understand what you're talking about if you don't quote the
previous message.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
73! de Andy KC2SSB - WPYI880 (GMRS)
Beachwood, NJ USA! Grid FM29vw
http://vhfradiobuff.tripod.com

I suggest another hobby, such as trap shooting. That way the "family" could
hold the clay pigeons while you shoot them.

Seriously, the mag mount is a good idea. I have used the car antenna for
receive only with a home made duplexer (diplexer?).

If you accidentally nuke the car radio, you're gonna be in BIG trouble.

Gud luk!,

Jack, K9CUN

"DeG" wrote in message
link.net...
I'm wanting to keep peace within the family.. NO! Extra antennas on the
vehicle..

Do what I did, bought my wife her own car.

Max wrote:
"DeG" wrote in message
link.net...

I'm wanting to keep peace within the family.. NO! Extra antennas on the
vehicle..

Do what I did, bought my wife her own car.

Perhaps what I said to my wife might help.

I don't go to bars and set around getting drunk.

I don't beat you or demean you.

I don't seek out other women for dalliances.

Now what was that about the antenna I wanted to put up?

I can put up my antennas without a lot of crap now.

- Mike KB3EIA -

"DeG" wrote in message
link.net...
I'm wanting to keep peace within the family.. NO! Extra antennas on the
vehicle..
I want to install a dual band 2m/440 mobile using the AM/FM antenna that
is
on the vehicle.. It will be mostly used for receive, BUT....
Other than a duplexer and tuner (s) What is needed to STOP the RF from
damaging the AM/FM radio in case I want to transmit?...
Any help on this??


You may do as I did on my new car.
I did not fancy drilling hole in my new car and decided to go for the
MFJ-1734 (a glassfix dualband antenna).
It is 26 inches and handles 50W.
I run it together with my Icom IC-2725E (IC-2720H) and it works very well.

Good luck!

--
73 de LA9EHA, Svein
Kristiansand, Norway

As has been mentioned, several outfits make desquised antennas, but are
expensive. Also, the BIG problem, in car radio antennas isn't the antenna,
but the FEEDLINE (coax) for it- center conductor is about the diameter of
#26- #30 wire! And to compuund it, todays vehicles are so stuffed under
the dash, it is hard to get to the coax/motorola fitting. But, if (and
have done this in the past), can get to it, and replace it with rg-58-u,
little detrement was observed to am/fm reception, and then the antenna, if
sized with a swr meter, for 1/4 or 3/4 wavelength , works well . also, think
(at least for 2 meters, some outfits still make antenna tuners for
vehicles)! or, build your own tuner/duplexer (about $20 in parts, max)
(course, like the one about leaveing the XYL/kids in the trunk, especially
if it soundproofed)! Jim NN7K



"DeG" wrote in message
link.net...
I'm wanting to keep peace within the family.. NO! Extra antennas on the
vehicle..
I want to install a dual band 2m/440 mobile using the AM/FM antenna that
is
on the vehicle.. It will be mostly used for receive, BUT....
Other than a duplexer and tuner (s) What is needed to STOP the RF from
damaging the AM/FM radio in case I want to transmit?...
Any help on this??

On Sun, 26 Oct 2003 14:18:51 -0800, "Jim" wrote:

As has been mentioned, several outfits make desquised antennas, but are
expensive. Also, the BIG problem, in car radio antennas isn't the antenna,
but the FEEDLINE (coax) for it- center conductor is about the diameter of
#26- #30 wire! And to compuund it, todays vehicles are so stuffed under
the dash, it is hard to get to the coax/motorola fitting. But, if (and
have done this in the past), can get to it, and replace it with rg-58-u,
little detrement was observed to am/fm reception, and then the antenna, if
sized with a swr meter, for 1/4 or 3/4 wavelength , works well . also, think
(at least for 2 meters, some outfits still make antenna tuners for
vehicles)! or, build your own tuner/duplexer (about $20 in parts, max)
(course, like the one about leaveing the XYL/kids in the trunk, especially
if it soundproofed)! Jim NN7K

I mount the rig under the seat, the control head on the console, the
dealer ran the power cable as part of the deal on purchasing the car,
and the antenna is a Diamond mag mount with a 5 foot plus collinear in
the middle of the roof.

My wife has one too, but as she puts her car in a regular size garage,
the antenna is only about 14 inches tall.

Generally on the modern cars there are a number of places where you
can run the power cables through a boot that houses an existing cable.
The mag mount I snake out a door, or window. On my SUV I use the door
behind the driver as it's almost never opened. The coax is snaked
into and under the weather seal about half way down and then follows
under the seal up to the top to the antenna.

Most cables fail within a year, but his one is over 7 years old.
Rig is a TM-D700.

Roger Halstead (K8RI EN73 & ARRL Life Member)
www.rogerhalstead.com
N833R World's oldest Debonair? (S# CD-2)



"DeG" wrote in message
hlink.net...
I'm wanting to keep peace within the family.. NO! Extra antennas on the
vehicle..
I want to install a dual band 2m/440 mobile using the AM/FM antenna that
is
on the vehicle.. It will be mostly used for receive, BUT....
Other than a duplexer and tuner (s) What is needed to STOP the RF from
damaging the AM/FM radio in case I want to transmit?...
Any help on this??