"Roy Lewallen" wrote in message
...
The discone would be better for local amateur VHF communication and
listening to the aviation band. The quadrifilar helix would be better
for receiving the weather satellite. If you can only have one antenna,
you have to choose which applications you're willing to accept reduced
performance with.

Roy Lewallen, W7EL

OK Roy, I well understood.
I suspected well this purpose due to its vertical polarization. In fact I
was misleaded by the short radials placed at 45 deg on top. But it is common
and that doesn't differ from a ground plan vertical design, excepted it
offers a large bdw....

Thanks
Thierry, ON4SKY


Thierry wrote:

This is to receive WX APT signal on 137 Mhz and sometimes to work on VHF
or
listen to avi band.
According you 'd it be interested or not at all to select a discone
instead
of the helix ?
There is no advantage of using a discone, or even drawbacks vs. the
helix,
excepted the price ?

Thierry

I used to rx wx images off of the sat. USed a pair of crossed dipoles with a
reflector. Put it up on a pole high enough to clear the trees and you can
recive the sat from nearly horizon to horizon.
"Thierry" - wrote in message ...
Hi,

To pick up a 137 MHz signal from wx satellite (POES), are the discone and
quadrifilar helix antennas similar, I mean, they are different in design
but
for the rest ?
Are they both omnidirectional and are they both able to change
automatically
the elevation and azimuth to the satellite direction without interruption
and without requiring a rotator ? or only the helix provides this
capability
?

Thanks in advance

Thierry, ON4SKY
http://www.astrosurf.com/lombry