RE: [amsat-bb] Lock on Tracking

["Rod Smallwood" <Rod@xxxxxxxxxxxxxxxxxxxxxxxxx>]

Hi
  Well if we look only at AO40 for now it moves
fairly slowly. I have my 5 foot dish dismanteled
at the moment for the addition of motors. I used
to point it by hand with a long lead to a pair of
headphones for the FT847 to peak for max signal . 
I would get about 10-15mins of S5-6 beacon each time.
What I did was to look for the nulls either side
of the main signal and set the dish on the leading
down slope. This ment that it ran through the peak
and down the other side before I needed to reset it.
Not a wonderful method but it worked.

I would try the same thing to track it. Say peak it
up then run off left/rightand up/down to find the four 
nulls and estimate from there.

Rod G8DGR
   


-----Original Message-----
From: Ben [mailto:b-fisher@uiuc.edu]
Sent: 11 December 2002 14:17
To: Rod Smallwood
Cc: AMSAT-BB
Subject: Re: [amsat-bb] Lock on Tracking


Hi Rod
  I have thought about building a system that would work by using the
signal
strength from the satellite as reference than a simple error amplifier
circuit to drive the AZ-El. But this may be very difficult if the signal
from the satellite fluxuates allot. With fast enough circuits and
motors, it
seems possible, but it would probably take a good computer programmer to
develop a workable algorithm.
My thoughts
Ben K9BF
----- Original Message -----
From: "Rod Smallwood" <Rod@sbs293.customer.demon.com>
To: <amsat-bb@AMSAT.Org>
Sent: Wednesday, December 11, 2002 4:16 AM
Subject: [amsat-bb] Lock on Tracking


> Unless I am much mistaken everybody uses predictive tracking.
> Has anybody had any experience with Radar style tracking
> where the system locks on to the target (ie AO40) and follows
> it?
>
> Rod (G8DGR)
>
>
>
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