help- Mobile 10meters on a jeep
 

Jerry wrote:
"KE5MBX" wrote in message
oups.com...
I have been advised by some hams that the best way I can hope to do 10-
meters on my jeep is to mount my antenna ON THE WINDSHIELD to get a
good ground plane. I read somewhere since then that the primary
reason for cophasing CB antennas on trucks is NOT to direct the gain
front and back, but to even the ground plane as though the antenna
were in the center of the truck. Could I achieve the same effect with
my Jeep by cophasing antennas on either side of the jeep by the
doors? Even better- could I do this diagonally across from one corner
of my jeep to the other? I heard the further apart the antennas are,
the better, and I'm not really trying to get front/back gain for DXing.

When it is all said and done, *I* would go with a single 102" whip cut for
10 Meters and mounted via ball mount on the left rear fender.

Then it wouldn't be 102 inches any more... Sorry, I couldn't help it...;^)


This will
work well, it is simple, and you will not be able to measure any appreciable
benefit as to pattern or gain with any phasing arrangement. The thing about
"cophasing" is more hype from the CB world (gullible people buy MORE
antennas if they think some gadget will work better ;) )! To each his own,
but I wouldn't go to all the trouble.

Nelson, I would agree with Jerry as to the antenna choice. Cophasing
won't do much for ya, and halfwave is getting out of hand for 10 meters
mobile.

As a thought, in amateur mobile, where Ops are trying to pull out every
last bit of efficiency, the cophase antenna just isn't to be seen. The
biggest problem with them is that the logic is almost irresistible. Two
antennas just *seem* like they would be so much better than one.

That being said, experimentation is great fun, and you can get mobile
antenna parts at hamfests, or even make your own.

- 73 de Mike KB3EIA -

help- Mobile 10meters on a jeep
 

Michael Coslo wrote:
Jerry wrote:
When it is all said and done, *I* would go with a single 102" whip cut
for 10 Meters and mounted via ball mount on the left rear fender.

Then it wouldn't be 102 inches any more... Sorry, I couldn't help
it...;^)

Actually, a 102 inch whip has a feedpoint resistance
closer to 50 ohms than does a 98 inch whip. A series
cap will get rid of the inductive reactance and then
one does have a fully function 102 inch 10m whip.
--
73, Cecil http://www.w5dxp.com

help- Mobile 10meters on a jeep
 

"Michael Coslo" wrote in message
...
Jerry wrote:
"KE5MBX" wrote in message
oups.com...
I have been advised by some hams that the best way I can hope to do 10-
meters on my jeep is to mount my antenna ON THE WINDSHIELD to get a
good ground plane. I read somewhere since then that the primary
reason for cophasing CB antennas on trucks is NOT to direct the gain
front and back, but to even the ground plane as though the antenna
were in the center of the truck. Could I achieve the same effect with
my Jeep by cophasing antennas on either side of the jeep by the
doors? Even better- could I do this diagonally across from one corner
of my jeep to the other? I heard the further apart the antennas are,
the better, and I'm not really trying to get front/back gain for DXing.

When it is all said and done, *I* would go with a single 102" whip cut
for 10 Meters and mounted via ball mount on the left rear fender.

Then it wouldn't be 102 inches any more... Sorry, I couldn't help it...;^)

NOW CUT THAT OUT!! :) Just because I was about to go to bed when I posted
that........................LOL!
;) ;)

73

Jerry
- 73 de Mike KB3EIA -

help- Mobile 10meters on a jeep
 

I have been advised by some hams that the best way I can hope to do 10-
meters on my jeep is to mount my antenna ON THE WINDSHIELD to get a
good ground plane. I read somewhere since then that the primary
reason for cophasing CB antennas on trucks is NOT to direct the gain
front and back, but to even the ground plane as though the antenna
were in the center of the truck. Could I achieve the same effect with
my Jeep by cophasing antennas on either side of the jeep by the
doors? Even better- could I do this diagonally across from one corner
of my jeep to the other? I heard the further apart the antennas are,
the better, and I'm not really trying to get front/back gain for DXing.



Not sure of the mounting issues on your Jeep, but have you considered a
Halo?

Ed K7AAT