DH Satellite 39 Polar Or Az-EL Series - Manual (Page 4)

Normally almost an Inch of the wave-guide will protrude past the ring for an F/D ratio of .3. Slightly more
than 1/2" for an F/D ratio of .375 and less than 1/4" for an F/D ratio of .44. The F/D ratio is obtained by
dividing the diameter into the focal length. An 8" antenna (96") divided into a focal length of 36" equals
.375 F/D ratio.
On DH dishes 1M – 10 7/8” f/l
On DH dishes 1.2m, 1.5m, 1.8m – 21 7/8” f/l
On larger DH dishes – 35 7/8” f/l
FINAL ASSEMBLY OF ANTENNA AND MOUNT
Lift the main body of the mount onto the base post and turn so that bearing plates face approximately south.
Lift the dish with frame attached up onto the main body so that the bearing bolts go through the frame bearing
plate holes. (Fig. 1) The longer frame plate is the top one. Hold the dish steady while attaching either the
locking bar or the actuator. Snug tighten the nuts.
A brief explanation of polar mounts: The satellite
is in an orbit over the equator and appears to be
stationary because it goes around the earth in
exactly 24 hours. To track it, our dish must pivot on
an axis that is parallel to the earth's (because we
are not pivoting from the center of the earth an
adjustment is made to the calculations). At the
equator there is no declination adjustment, at other
latitudes because the satellite is at the equator and
not parallel with you, the dish must tip forward to
see the satellite. This is declination.
7’7" 35 ¾” Focal Length - .39 F/D - Wave Guide 3/8”
8' 35 ¾” Focal Length - .375 F/D - Wave Guide 9/16”
9’ 35 ¾” Focal Length - .33 F/D - Wave Guide 5/8”
10’ 35 ¾” Focal Length - .3 F/D – Wave Guide 7/8”
Page 4
STOP: Should you have a 4pc antenna go to page 5 at this time.