P
rep
ar
ing the C Band Fe
e
d
A
s
se
mbly
C14F2018
If the feedhorn
y
o
u
ha
v
e
s
elected has an adjustable
s
calar ring
,
move it to the proper wave guide
s
etti
n
g
as
per
t
h
e
manufacturer
'
s in
s
tructions. Belo
w
w
e ha
ve
li
s
ted the focal length
s
and
f
oca
l l
ength d
i
amete
r
ratios for our commercial antenna
s
.
Just find your antenna and you will
h
ave the
i
n
forma
t
ion to
s
et t
h
e sc
a
la
r
properly.
Special Note: More critical than setting the wave guide to the manufacturer's recommendations is to make sure
you are setting the feedhorn at the correct focal length of the antenna.
Y
o
u
r DH re
pres
e
ntative sh
o
uld
h
av
e as
k
ed y
o
u wha
t
t
y
pe
fe
e
d y
ou
w
il
l
b
e
u
s
ing. We
n
ee
d thi
s
inf
orma
t
io
n t
o
b
e
ass
ured we are sending the proper
co
l
lar t
o a
ttach your feed
t
o
o
ur s
t
ruts. A DH C14F2018 is supplied as standard unless you have made a request for another style collar.
Place th
e
C14F2018
c
ol
l
ar or collar supplied on the back of the feedhorn scaler ring. Turn the scaler plate off the feedhorn so that all three holes line up
between the slotted holes on the feed collar.
Ins
e
r
t
th
e
1/4" x 3/4"
bol
t
s through the
s
calar ring an
d
the
n
t
h
r
u the c
o
llar; f
as
t
en wi
th
the 1/4" n
ut
s.
(
M
o
st
C-
b
and and
d
u
a
l feeds have a 3-bolt pattern on the scalar r
i
ng a
s d
e
s
cr
ib
e
d a
bo
ve
).
For heavy duty SEAVEY (C24HD) or heavy duty CHAPARRAL (C14FHD) feed assembly please refer to page 10 and page 11.
For CHAPAR
R
AL
ty
pe feed
s
, refer to Figure #10
.
Slip the feed strut into a tab o
n
the
c
ollar and
li
ne u
p th
e
two h
o
les. Ins
ert
t
h
e
2
– 5/16” x 3/4”
bolts into the holes and tighten with the 5/16" n
u
t
s
.
P
r
o
ce
ed with placing all four struts in every other hole, then
c
he
ck and measure the
f
oca
l
length
according to instructions and tighten down
. Be sure your focal length is set correctly and you’re looking at the center of the dish.
On a Chaparral style
feed t
h
e actu
al
foca
l l
e
n
g
th sh
o
uld
be 1/4” in
s
ide the wave
g
uide for C
-
band and 1/8”
for Ku b
a
nd
. Seavey recommends the focal length is measured
to front of the scalar ring.
C14F2018
Figure # 10
C14F2018
5/16” Lock Washers & Nuts
5/16” x 3/4” Bolt
3/4” Feed Strut
Page
9A
1/2" x 3” Bolt
Antenna Size Focal Len
g
th Focal Distance
1
0
'
(
3.0m
)
36
"
f
/l .3
f/d
11' (3.3m)
36" f/l
.28 f/d Discontinued
12
' (
3.7m
)
57
.
6" f
/l .4
f/d
12’5” (3.8m)
57.6”f/l
.378 f/d
12' 9" (3.9m)
57.6" f/l
.375 f/d Discontinued
14
'
(
4
.
2m)
57
.
6" f
/l .34
f/d
1
4
'
9
" (
4.5m
)
57.
6
"
f
/l .33
f/d
Collar
1/2” Rubber Washer
Antenna Surface
1/2” Steel Washer
1/2” Nut
For use of Chaparral Feeds C14F2018
NOTE:
C14F2018
Strut
length
includes
bend
in
measurement.
