Re: [amsat-bb] 2..4ghz dishes

[Joseph V Murray <k0vty@xxxxxxxx>]

Hi Jerry

If you are reporting on the use of a circular polarized ( helix ) and a
linear polarized antenna ( BBQ dish).    What "S" units do you attribute
the difference in the polarization ?   

Joe K0VTY
=================================

On Sun, 18 Feb 2001 12:57:50 EST K5OE@aol.com writes:
> Mark,
> FWIW, I set up one of the 24 dBi dishes (belongs to KK5DO) on a 
> tripod and 
> listened to the telemetry downlink on AO-40.  Using a compass and 
> the S-meter 
> on my rig, I estimate the "real world" 1/2 power beamwidth to be 
> less than 8 
> degrees--I would lose 2 complete S-units of signal at 5 +/- degrees 
> (from S7+ 
> to S5).  At +/- 10 degrees, the signal was about half that of the 
> 16-turn 
> helix (S3 compared to S5 with the helix).  
> 73,
> Jerry, K5OE
> 
> w7lrd@juno.com writes:
> 
> > To me it sounds like these "meyers" type bbq grill dishes are a 
> more
> >  effective way to go as opposed to a helix.  Is it correct that 
> the 3db
> >  points are at 8 degrees?  I use U100 type az/el rotors and I get 
> about 6
> >  degrees per click.  So my pointing accuracy would be rather 
> critical. 
> >  Anyone have any familiarity with this situation, I will be using 
> a drake
> >  converter (thanks Mark).
> >  73...Bob...W7LRD
> >  Renton, Wa.
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