[Moon-Net] Prime-focus vs. Offset-dish
rmoncur at bigpond.net.au
Wed Nov 23 20:56:21 CET 2016
One issue with offset dishes that has not been discussed so far is how to
mount them in a way that allows you to beam low at the horizon. I notice
that often people with offset dishes cannot work down to zero degrees as the
bottom of the dish comes back against the vertical part of the mount. This
can be resolved by putting the feed at the top but then the feed is more
difficult to access.
Another solution is to have the vertical mounting extended into an L shape
to mount the centre of the offset dish so it is clear of the vertical part
of the mount when beaming at low elevations. The downside of this it that
all the weight is leveraged to one side of the mount and you need a much
stronger mount to maintain accurate elevation.
73 Rex VK7MO
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