Re: [amsat-bb] Roast "ham", anyone?

[Jon Ogden <na9d@xxxxxxxxxxxxxx>]

on 3/1/01 5:37 PM, Frederick M. Spinner at fspinner@hotmail.com wrote:

> I'd assume that an Arrow has to have at least 25 dB F/B.  So say
> you see +25 dBm pointed back at you.  Thats 316.2 mW.
> 
> I'm not saying you should do this, but I'd imagine you could get more than
> that exposure from your HT with a rubber duck.

Good figures, Fred.  The math ALWAYS overcomes emotional hysteria.

With an HT on 5 Watts right next to your face, you are exposed to pretty
much 5 Watts, NEAR FIELD included.

So your exposure with a 25 to 50 Watt handheld beam is far less off the back
end than an HT with a rubber duck.

Even though the back lobe of a beam may be significant, let's remember that
every 3 dB reduction is half the power.  So even if the beam had only a 9 dB
F/B ratio, you'd still only get 3.125 Watts back at you with 25 Watts out.
Still less than an HT.

73,

Jon
NA9D

-------------------------------------
Jon Ogden
NA9D (ex: KE9NA)

Member:  ARRL, AMSAT, DXCC, NRA

http://www.qsl.net/ke9na

"A life lived in fear is a life half lived."

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