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Re: LF: SAQ nil

To: [email protected]
Subject: Re: LF: SAQ nil
From: "Dick Rollema" <[email protected]>
Date: Sun, 06 Jul 2003 22:52:24 +0200
In-reply-to: <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
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:
>>>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:
>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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