[Moon-net] Array Pointing Accuracy

[Edward Cole]

I'm using four M2-Xpol-20's for several years now and find that I 
like to touch up the pointing about every 5 degrees and not let the 
Moon drift more than 10-degrees off point.  That results in 
re-pointing about every 20-30 minutes.  But I have seen signals of 
some of the big guns even 30-degrees off point to my 
astonishment.  But if I am too far off-point my QRPp will not make to 
the other station.

73, Ed - KL7UW

At 09:58 AM 11/5/2007, John Peters wrote:
>Hi,
>
>Your -3dB beamwidth is about 18 deg I think... so few degrees off is no
>problem. I used to adjust my antenna only once every 15 minutes..
>
>73! De John PA5MS
>
>-----Oorspronkelijk bericht-----
>Van: moon-net-bounces at list-serv.davidv.net
>[mailto:moon-net-bounces at list-serv.davidv.net] Namens Dave Anderson, K4SV
>Verzonden: maandag 5 november 2007 19:48
>Aan: EME Reflector
>Onderwerp: [Moon-net] Array Pointing Accuracy
>
>Hi All,
>
>I have another question that I would ask to have answered.  I have just
>erected a new H frame festooned with 4 M2 2MXP20's.  As I tweak this antenna
>system I thought it would be nice to know exactly how close must I track the
>Moon.  The obvious question is, of course, right on the moon.  But you and I
>both know not every antenna system tracks exactly, there is always some
>positioning error in the rotors ETC.  Just so I am clear on this, what is
>the acceptable pointing accuracy so I can keep within the maximum gain?
>
>I have played a bit by jockeying the antenna around to see if I can peak the
>signal and it seems to be a bit broad.
>
>Thanks in advance,
>
>Dave Anderson, K4SV
>Tryon, NC
>828 777-5088
>
>www.K4SV.com
>
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73,
Ed - KL7UW
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