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Re: RE: NEW TO SATELLITES - HELP



Hi Mike,

Yea, I'm working on an inverted-V which should improve things on the 
downlink, not that it needs it as the sigs are pretty strong.

I have been getting a lot of replys that RS15 is pretty difficult to 
get into these days - so for the time being, I'll pass on that one :-)

The FT847 sticks out 50 watts on 2 meters and 70 cm's so without 
adopting an amp to pump the sigs up a bit I'm stuck with 50W.

Pete VK4CCV

----- Original Message -----
From: "Michael P. Olbrisch" <kd9kc@elp.rr.com>
Date: Wednesday, January 16, 2002 9:51 am
Subject: RE: [amsat-bb] NEW TO SATELLITES - HELP

> 
> 
> > -----Original Message-----
> > From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
> > Behalf Of pmoscatt@bigpond.net.au
> > Sent: Tuesday, January 15, 2002 11:16 PM
> > To: amsat-bb@AMSAT.Org
> > Subject: [amsat-bb] NEW TO SATELLITES - HELP
> > 
> > 
> > I plan to start at the basement and work the "Easy Sats" 
> > first, namely RS12 & RS15 until I get the hang of it all.
> 
> RS-15 is anything but EASY.  Better stick with RS-12
> 
> > I have a dipole that I listen to the beacon on (29.408) where I 
> can 
> > hear it without any trouble at all.
> 
> Change it to an inverted-V, or a 10m turnstyle, give you better
> omni coverage.
> 
> > My 2 Meter antenna is a base 5/8 Ground Independant Vertical.
> 
> It will work, with enough power.
> 
> > When I try and work into RS12, I hear my returned signal very 
> > faintly - no where near as loud as the beacon.  I have put this 
> > down to the vertical having a very low angle of radiation 
> therefore 
> > when the sat passes over with anything greater than 30-45 
> > degrees of elevation I can't hear myself at all.
> 
> You never mention your output power.....
> 
> > My question is:  What would be a good 2 Meter antenna to get 
> > me started off with and ensure I have reliable uplinks ??
> 
> 2m turnstyle 3/8 wave over a ground screen.
> 
> Satellite systems are an ERP game.  You need to know output
> power, feed loss, antenna gain, path loss, and receiver
> sensitivity.  When any one of those falls below a minimum
> threshold, you do not communicate.  I worked many passes
> of RS-12 using 100 watts up into a J-pole.  Antenna was
> right above the shack, minimal coax loss.  Of course, if they
> are all good enough, and you don't care, then they don't matter
> at all.... as long as you are communicating.
> 
> Mike.
> 
 

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