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

[Gus]

No reason why not.  The power at each antenna will be 3 dB down, but you 
will get an additional 3 dB of gain for using two antennas, so there 
will be (nominally) no loss, assuming the antennas are oriented the same.

Or you could orient them 90 degrees apart, use an electrical 1/4 wave 
matching section of 75 ohm coax on each antenna, plus an electrical 1/4 
wave phasing section of 50 ohm coax on ONE antenna, and you have CP 
radiation.  Use a double-throw relay to switch the phasing section from 
one antenna to the next, and you have switchable RHCP/LHCP.  In this 
case you WILL suffer a 3 dB penalty when working signals with linear 
polarization.

Another possibility I want to try some day:  use a radio with diversity 
reception (like IC-2820).  Connect one horizontal antenna and one 
vertical.  No matching or phasing, no manual switching of circularity.  
Just let the receiver decide which antenna is pulling in the strongest 
signal on a moment by moment basis.  Tx polarity is fixed, but you can 
turn up the wick to compensate!

On 04/16/2013 02:31 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.
>> _______________________________________________
>> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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>>     
>


-- 
73, de Gus 8P6SM
Barbados, the easternmost isle.