RE: [amsat-bb] Re: SUNSAT OVER EUROPE

[John Magliacane <magliaco@xxxxxxxxxxxxxx>]

On Tue, 27 Jul 1999, Jeff Johns wrote:

> On Tue, 27 Jul 1999 10:17:16 -0400 (EDT), John Magliacane <magliaco@email.njin.net> wrote:
> 
> > Perhaps future FM transponders can include an "alligator switch" to sense
> > the level of the uplink signal and shut down the transponder if it exceeds
> > a predetermined level.
> 
> Interesting idea, but what if say I'm working in a jungle/rainforest type
> setting and I need to make an emergency communication with of of these birds
> and my cell phone is broken and all I have is the ham gear. I am going to
> want to use as much power as I can in this situation in order to gaurantee
> that someone hears my call for help, but what would happen is the darn
> transponder would turn itself off leaving me stuck in the jungle while being
> attacked by a group of headhunters who want to behead me....... :(
> 
> Jeff

Simply lower your power to the point that the transponder turns back on.

In FM communications, you only need a signal strong enough to produce
a sufficient amount of quieting in the receiver to be heard above the
ambient noise.  Anything beyond that is simply a waste of RF power.


73, de John, KD2BD

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