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RE: TranSystem MMDS converter for AO-40





Tony Langdon. 
Systems Development and Support. 
ATC Training Australasia.  Level 2 321 Exhibition St Melbourne  3000. 
Phone:  1300 13 1983     WWW:  http://www.atctraining.com.au 



> -----Original Message-----
> From: Christopher Cox [mailto:cobox@urec.net]
> Sent: Sunday, 18 March 2001 2:22
> To: johnh@ih2000.net
> Cc: amsat-bb@AMSAT.Org
> Subject: Re: [amsat-bb] TranSystem MMDS converter for AO-40
> 
> 
> 
> <SNIP Good Tech Info>
> 
> 
> > > The SIDC would attenuate the 2400Mhz signal up to 55dB.
> > > The TSIdc looks like it would lack the gain necessary.
> > 
> > I'm not familliar with those units- what are they?
> >
> 
> TransSystem latest additions to their product offerings.
>  
> > > 
> > > Other problems would be the built in (integrated) dipole antenna
> > 
> > Chris, why is that a problem?  If you want to use the dipole as a
> > quick, easy feed for a dish, it is very convienient.  If you want
> > to use a separate antenna, you remove the dipole and replace it with
> > an N connector.  I don't view the built-in dipole as a problem, but
> > as expanding my choices.
> > 
> 
> I was lead to believe that using a different antenna other 
> than the dipole
> would no be wise, by the company representative. He hinted around the
> weather tightness being compromised amongst other things.
> 		(Warning, run on sentence ahead)
> >From my own experiences working satellites, unless you have 
> the antenna in
> your hand, a antenna with a linear polarization (i.e. Horizontal or
> Vertical) can be quite problematic exhibiting strong fades. 
> Perhaps the
> dish helps with this? I do not know.
> 
> > > 
> > > I talk to a company contact a few months ago, he seem to 
> think that the
> > > units would need modified. He was willing to have a 
> custom batch run,> This is great news John, I will be ordering mine now.
Maybe I 
> can find a
> way of converting the dipole into a turnstile...:-)

Add another dipole and a phasing line. :)
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