Re: [amsat-bb] ao-40 antennas

[Al Lawler <alawler@xxxxxxxxxx>]

  Once again, I agree with ed, at least as far as
voice/cw are concerned,   however if the recent
comments about the strength of Rudak are true, it
should be possible to operate a 'digital only' ao-40
station with antennas in the 16 db range, assuming
rudak runs at the same power as it seems to be during
the commissioning.

  -al
  WB1BQE

 P.S. just as a datapoint,  I'm Currently copying 70% TLM 
@51000 km and 14deg squint with a 24dbi(l) bbq dish, dem 
preamp and easy-mod drake through a thin screen of trees.

  Got here too late to mess with voice tonight...





"Edward R. Cole" wrote:
> 
> Vince,
> 
> Unless you are content to only operate mode-S1, and hear that poorly, I
> don't think 16 dBi is enough gain.  If you are going to expend the time,
> energy, and cash to get a dish, then get one with a minimum of 22 dBi.  I
> think if you have a decent preamp with <1 dB NF, that will give you an
> adequate {but not top} 2.4G system even with a linear feed.
> 
> To really take advantage of mode-S2 and operate at squints >10, then I
> would think 24 dBi and go circular polarity.  To my thinking the "magic
> numbers" are: 24 dBi and 1 dB NF!
> 
> But I hope people using linear-pol will respond with their experience, and
> what they are using {be sure to quote your NF, too}.
> 
> Ed
> 25.5 dBic, 0.7 dBNF
> 
> At 10:32 AM 8/11/2001 -0600, you wrote:
> >How happy are people using dishes with linear polarization?  I'm starting
> >to look at dishes now.  Is 16dBi giving good results?
> >
> >kb7adl
> 
> 
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