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Re: LF: Antennas

from [mal hamilton] [Permanent Link][Original]
To: <[email protected]>
Subject: Re: LF: Antennas
From: "mal hamilton" <[email protected]>
Date: Tue, 3 Jan 2012 22:43:32 -0000
References: <008301ccc97c$51d9fcf0$0401a8c0@xphd97xgq27nyf>,<CABP+t7Zgr4iUWhCQzTKnqBQFcsK4_=zjuPWd5AHkvU5Tggu1EA@mail.gmail.com> <BF4A524700075746A6467658DFC7102CB0B489A6C5@ICTS-S-EXC2-CA.luna.kuleuven.be>,<003501ccca06$6bdef490$0401a8c0@xphd97xgq27nyf> <BF4A524700075746A6467658DFC7102CB0B489A6C6@ICTS-S-EXC2-CA.luna.kuleuven.be> <[email protected]> <004601ccca20$8aa7d1c0$0401a8c0@xphd97xgq27nyf> <00fc01ccca65$47277e60$1502a8c0@Clemens04>
Reply-to: [email protected]
Sender: [email protected]
Merchant ships used inv L antennas slung between two masts and in some cases additional long whips for MF/HF. Aircraft also used inv L and long wire antennas strung between the cockpit and the top of the tail fin for MF/HF plus a trailing antenna that could be wound in/out as required.
No pocket micro or ferrite sticks used. Some early aircraft also had a small loop antenna for DF purposes.
I know why fixed services used large wire arrays,   for directivity and gain and switchable in direction in some cases but not so sure others did. 
A tuned loop on a Battleship could be tricky with all the metal about.
 
mal/g3kev
 
----- Original Message -----
Sent: Tuesday, January 03, 2012 10:15 PM
Subject: Re: LF: Antennas

Mal,
 
>Why do commercial receiving stations use large antenna farms out in the countryside ??
 
The reason is to get as much *directivity* gain as possible.
BTW british military vessels since decades used to use tuned loops with a preamp
for VFL/LW/MW operation.
And they operated also in CW in those days...
 
73
Clemens
DL4RAJ
----- Original Message -----
Sent: Tuesday, January 03, 2012 3:03 PM
Subject: Re: LF: Antennas

4120 - Ausgabedatum: 03.01.2012
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