I did it at field day last year, a couple of Arrow antennas with the 2
meter side set up for RHCP. Seemed to work real well on the analog birds.
Some 75 ohm coax does the matching, see a picture at
http://www.n0jy.org/images/IMG_20120623_215906.jpg
The picture was taken at night, so look closely and you'll see a 1/4
wave 75 ohm section at the tee to both sides, the right side directly to
the antenna and the left side to another 1/4 wave 50 ohm section
connected to the antenna.
Credit goes to SV1BSX I got the idea from his web site
http://sv1bsx.50webs.com/antenna-pol/polarization.html
Jerry
N0JY
On 4/16/2013 1:31 PM, Douglas Phelps wrote:
Any reason why, using identical coax lengths, you could not transform the
impedance to 100 ohms and then use a T connector to sum both antenna signals and
achieve 50 ohms to the radio? I know Transmit power will be 3 dB down at either
antenna but is there any reason it will not work? Any antenna gurus out there?
________________________________
From: R.T.Liddy <k...@ameritech.net>
To: amsat-bb@amsat.org
Sent: Tue, April 16, 2013 11:46:35 AM
Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or horizontal
For the Satellites, it completely doesn't matter. At any given moment,
you only have 1 chance in 90 that you will have matching polarization.
So, if you plan to use the antenna for other than Satellites, set your
polarization
for that purpose (V for FM or H for SSB/CW).
My plan is to install 2 Elk antennas, one V and one H. Then, have a relay that
I can switch between the two and choose the best downlink signal at any
given moment. This arrangement will also give me optimum flexibility for
terrestrial operation on 2 & 440.
Now, where can I find a relay to do that function?????
73/GL, Bob K8BL
--- On Tue, 4/16/13, Lee Maisel <mai...@lobo.net> wrote:
From: Lee Maisel <mai...@lobo.net>
Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or horizontal
To: "Don Hoover (WS4E)" <w...@arrl.net>
Cc: amsat-bb@amsat.org
Date: Tuesday, April 16, 2013, 12:24 AM
Hi Don,
I have mine mounted with 2m elements horizontal, because that's how it
seems I used it most when it was handheld.
Lee
W5LMM
Don Hoover (WS4E) wrote:
Just wondering, should I mount my arrow with the 2m elements oriented
vertical or horizontal?
I am planning on putting it at 15deg and just using a az rotator.
Does it even matter which way its oriented since the polarity of the sats
are always changing?
Maybe I should mount it like this: / instead.
Just curious what some thought was the best way to go.
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