[amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or horizontal

[Jeff KB2M]

Or check out the plans (from the AO-40 days) and build notes on how to build
a circular phasing harness for the arrow 70cm crossed yagi on my website

 http://home.comcast.net/~kb2m/

It also describes in detail how I used an MFJ 259 to fine tune the
harness...

73 Jeff kb2m


-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Gary "Joe" Mayfield
Sent: Tuesday, April 16, 2013 20:52 PM
To: 'AMSAT-BB'
Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or
horizontal

It can work well.  At w0wtn we did circular for VHF and UHF in 2005.

There is a picture of the setup here:
http://www.w0wtn.org/img_browse.php?i=/images/field_day_2005/KK0SD_Sat_Ant.j
pg

I took the phasing info straight from the Satellite Experimenter's Handbook.

You might notice the S Band cavity backed Helix as well :-)


73,
Joe kk0sd


-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of N0JY
Sent: Tuesday, April 16, 2013 5:03 PM
To: AMSAT-BB
Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or
horizontal

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 <k8bl at ameritech.net>
> To: amsat-bb at 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 <maisel at lobo.net> wrote:
>
>
> From: Lee Maisel <maisel at lobo.net>
> Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or
horizontal
> To: "Don Hoover (WS4E)" <ws4e at arrl.net>
> Cc: amsat-bb at 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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>