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Re: LF: Amp metres

To: [email protected]
Subject: Re: LF: Amp metres
From: "vernall" <[email protected]>
Date: Thu, 30 Mar 2000 23:05:49 +1200
References: <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
Bob Eldridge wrote:
>An amateur regulatory constraint of 1 watt eirp limit starts to bite in
>to the transmitter power budget for taller (more efficient) antenna
Bites in even more with a smaller antenna surely!
What I meant to suggest was that a small antenna needs a great deal of
applied power to achieve a radiated power of 1 watt.  For most hams, it
is impractical to get near 1 watt eirp with realistic transmitter
power.  On the other hand, the big antenna only nneds a QRP transmitter
connected to get 1 watt eirp.

Didn't Dud Charman's indoor antenna circus demonstrate the truth of the
axiom that a small antenna has the same radiation pattern as a very small
I also believe that all short verticals have the same basic radiation
pattern (the upper hemishere of a doughnut, with low angle suckin if
ground loss is significant).
Maybe a decommissioned Decca site could be better used to demonstrate the
efficacy of passive reradiation from an adjacent tower.
Any tests would be interesting.  Big sticks are hard to come by.


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