[amsat-bb] Re: ao-51 mode L/S
Alan P. Biddle
APBIDDLE at UNITED.NET
Thu Nov 13 11:39:28 PST 2008
>>Are those who are working AO-51 mode L/S mostly using rotors and tracking
Yes, though in some cases the rotators are "Armstrong Rotators." That is,
>> What are you using to keep the antennas pointed for mode L/S and what are
you using for antennas?
Any AZ-EL array will work fine. The beam widths are not that narrow. For
the S-band side, most people use a small dish, though AO-51 is so loud that
even a modest Yagi or loop Yagi is fine. For the L-band, a linear Yagi or a
helix. NOVA, SATPC32, Ham Radio Deluxe, or something like a TrakBox will
easily handle for pointing the antennas.
At these frequencies, the real need is for computer frequency control to
compensate for the Doppler. It can be done manually, but if you don't have
that, you are going to be spending a lot of time talking yourself back on
frequency, and giving and asking for repeats. SATPC32 of course works
perfectly, and the new, improved Ham Radio Deluxe has performed well.
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