- Original Message -
From: Rolf Krogstad rolf.krogs...@gmail.com
To: Bob- W7LRD w7...@comcast.net
Cc: amsat-bb@amsat.org
Sent: Tuesday, May 14, 2013 4:04 AM
Subject: [amsat-bb] Re: Helical Antenna on 70 cm
Thanks, Bob.
Is there a commercial yagi available for 435 MHz which is R-L switchable
A good source of antennas and antenna advice is Dave W6OAL
http://www.hamtv.com/oal.html
He likes Loop yagis for 23cm
-Original Message-
From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Rolf Krogstad
Sent: Monday, May 13, 2013 10:23 AM
To:
the helix is a nice antenna...however...once wound for either RHCP or LHCP
there's no going back. So switching from R to L or L to R is out of the
question. Unless of course the chosen polarity is always compatible with the
satellite in use. Unless you have L and a R helix and switch between
Thanks, Bob.
Is there a commercial yagi available for 435 MHz which is R-L switchable?
Rolf NR0T
On Mon, May 13, 2013 at 8:21 PM, Bob- W7LRD w7...@comcast.net wrote:
the helix is a nice antenna...however...once wound for either RHCP or LHCP
there's no going back. So switching from R to L
Hi Rolf,
My understanding is that the material used for center pole in a helix
doesn't affect the antenna dimensions or performance much at all. So,
feel free to use whatever material you have handy that will work
mechanically and environmentally (e.g. ice load and sun exposure). I've
Hi Rolf,
I don't believe that's possible. It would be like asking for a screw
that can be turned in either direction. L / R switching is done by
switching between two antennas.
Greg KO6TH
Rolf Krogstad wrote:
Thanks, Bob.
Is there a commercial yagi available for 435 MHz which is R-L
M2 makes one, and I think Gulf Alpha antennas has one.
73, Jim KQ6EA
On 05/14/2013 02:04 AM, Rolf Krogstad wrote:
Thanks, Bob.
Is there a commercial yagi available for 435 MHz which is R-L switchable?
Rolf NR0T
On Mon, May 13, 2013 at 8:21 PM, Bob- W7LRD w7...@comcast.net wrote:
the
Hi Rolf, NR0T
The fiberglass rods made of Isophthlic Polyester Resin
is a good choice of material at UHF frequencies and it is
the material I have used for my RHCP 10 turns Helical
Antenna for 435 MHz in use on the roof since 1976
beginning from OSCAR-8 Mode-J and actually working
since than for
