[amsat-bb] Re: Accuracy?
Thu Aug 24 21:27:15 PDT 2006
It depends on the level of automation of your station... if you are using
fixed antennas, you only need enough accuracy to know when the satellite is
in view. If you are using rotor control, it depends on the beamwidth of
your antennas ( the narrower the beamwidth, the more critical the aiming
becomes). If you are using doppler control, then very high accuracy is
needed: a few seconds of error can translate to several hundred hertz of
doppler shift on a high pass.
I have my XP machines set to check an internet NTP server every 4 hours.
For Field Day, I use a GPS receiver to keep the PC clock dead on, and always
use GPS to set my station coordinates accurately when portable. And when in
doubt, I update my keps right before operating, and at least once a week
----- Original Message -----
From: "Stargate" <email@example.com>
To: "Amsat-Bb" <firstname.lastname@example.org>
Sent: Thursday, August 24, 2006 4:29 PM
Subject: [amsat-bb] Accuracy?
>I guess my question should be....How much accuracy is required for
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