So: is the system directional ?
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
|
