On Tue, 11 Dec 2007 11:55:16 +0100, Helmut Wabnig hwabnig@ .- --- -.
DOT .- t wrote:


Does anybody have more info?
You do. What's your operating frequency range.
Why do you keep it top secret?

Ahhh...it's in the subject line!
Whip on portable vs Dipole Gain for 2m or 70cm

WhoonEarthreadssubjectlines?

sorry,
w.

On Dec 11, 12:02 pm, Helmut Wabnig hwabnig@ .- --- -. DOT .- t
wrote:
On Tue, 11 Dec 2007 11:55:16 +0100, Helmut Wabnig hwabnig@ .- --- -.

DOT .- t wrote:

Does anybody have more info?
You do. What's your operating frequency range.
Why do you keep it top secret?

Ahhh...it's in the subject line!

Whip on portable vs Dipole Gain for 2m or 70cm

WhoonEarthreadssubjectlines?

sorry,
w.

Thank you for this tentative...
So lets keep on 2m for the simplicity.
I know that you do not put a vertical dipole on a roof.
You put it on a mast, and this mast (if small) can be on (side of) car
when on halt...
The link budget will change by the fact that the dipole will be
higher. (easy to take in account in a formula like Eggli-Mod for
example). But there should be also a difference in Antenna Gain.
That's what I'm looking for!

Pierre

On Wed, 12 Dec 2007 01:34:16 -0800 (PST), ON7CIP - Pierre
wrote:


example). But there should be also a difference in Antenna Gain.
That's what I'm looking for!

Pierre

When mounting an 2 m antenna on a car you do not care for gain.
Care for good SWR on 2 m and 70 cm which is difficult enough
to obtain with a combined radial.
The direction characteristic of the antenna + car assembly is
totally unpredictable. Just try to have good horizontal radiation,
else you will only heat up the atmosphere.

The best place is in the center of the roof for a metal case car.
If you bought a plastic car, well, then you bought plastic.

w.