[amsat-bb] On satellite beacons and rotator mounting [was: Re: Re: Sat Demo Yesterday]
lochner at sun.ac.za
Sat Oct 23 06:33:50 PDT 2010
On Saturday, 2010-10-23 13:49 +0200, N. Mahdinejad wrote:
> Dear satellite operators.
> Is there any one? i dont recive any answer to my questions. help ma please.
> Which of amteur satellites have operatonal beacon downlink ?
> Thanks for your attention.
> Best Regards.
Be more patient: the majority of subscribers to this group are
probably from the North American continent. It is Saturday and their
day is just beginning.
Preferably also start a new thread with a subject line that properly
describes your issue. Under another topic people might just skip
over your message without reading it. They may also be more inclined
to respond to messages signed with a first/given name or an amateur
Regarding your question about beacons -- these pages are valuable
Live OSCAR Satellite Status Page
Operational OSCAR Satellite Status Summary
Regarding your earlier question about where zero azimuth is -- I am
not familiar with Unitrack but presume that it is similar to the
Yaesu GS-232B controller box for the Yaesu G-5500 motor controller.
When mounting a rotator there are two angle references that must be
related to each other in some way:
The first is the hardware read-out that will vary between the
extremes of rotation, according to the mode selected. In the case of
the GS-232B it runs from 180 through 360/0 to 180, or from 0 to 359,
or from 0 to 450. It is a scale to measure the relative hardware
The second is the mathematical definition of direction, which is
normally measured as an angle relative to true north, with clockwise
Your control software must have a setting to link a specific hardware
read-out value to where the rotator/antenna actually points. The
relative scale is thereby anchored to the mathematical definition of
73 de ZR1CBC, Johann.
More information about the AMSAT-BB