To All from PA0SE
Bryan, G3GVB wrote:
So: is the system directional
?
The gain I mentioned was in efficiency. But there may be some gain by
directivity of the aerial system as well, but this is not
clear.
73, Dick, PA0SE
Bryan -
G3GVB (Near Brighton )
-----Original Message-----
From: Dick Rollema <[email protected]>
To: [email protected]
<[email protected]>
Date: 06 July 2003 13:32
Subject: Re: LF: SAQ nil
>To All from PA0SE
>
>
>>valerio gabbani wrote:
>>>
>>>Alberto,
>>>Thanks for the info, did you know also the antenna system
used ?
>>>'73, Valerio IK5ZPV
>You can find info (in Swedish) on the Grimeton station SAQ,
including a
>photograph of the antenna system, at the following URL:
>
>www.alexander.n.se
>
>The antenna consists of six 127m high vertical top fed
radiators in line,
>each with its own earth tuning coil and earth electrode. This
decreases the
>earth loss because each earth electrode carries a current I/N, in
which I
>is the total earth current and N the number of radiators = number of
earth
>electrodes. The gain results from the fact that the total earth loss
is N
>times the loss around each electrode but the loss at each
electrode
>decreases at (I/N) squared. The system was invented by Alexanderson,
also
>designer of the alternator used at Grimeton.
>
>73, Dick, PA0SE
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