FAX 5/10/20/30/40KW
October 28, 2013
4
‐
5
888
‐
2720
‐
001
WARNING:
Disconnect
primary
power
prior
to
servicing.
Copyright
©2013,
Harris
Broadcast
4.1.4
FAX30 RF Block Diagram
The
FAX30
contains
three
10
kW
power
blocks
in
2
cabinets.
One
power
block
contains
the
Micro
Module
controller,
the
other
power
blocks
have
only
a
LED
Status
board.
Figure
4
‐
5
is
a
block
diagram
of
the
RF
of
the
FAX30.
Figure 4-5 FAX30 RF Block Diagram
The
output
of
the
Exciter
switcher
drives
a
2
‐
way
splitter.
This
splitter
is
a
4.77
dB
Hybrid
type
and
one
output
port
has
a
90
°
phase
shift.
In
cabinet
1
(
‐
1.6
dB/0
°
port)
drives
a
second
3
dB
hybrid.
The
output
provides
the
correct
phase
shift
to
combine
the
2
power
blocks
in
cabinet
1
and
the
RF
signal
now
has
a
‐
90°
phase
shift
compared
to
the
input
signal.
To
get
this
signal
to
combine
with
cabinet
2
an
additional
phase
shift
of
‐
90°
is
required
in
cabinet
2
so
that
the
inputs
to
the
4.77
dB
cabinet
combiner
are
‐
90°
from
each
other.
The
system
now
requires
2
reject
loads,
a
6
kW
power
block
combiner
reject
load
and
a
12
kW
cabinet
combiner
reject
load.
The
cabinet
combiner
load
is
sized
to
accept
half
the
total
RF
in
the
case
where
one
cabinet
is
off.
PB1
PB2
Exciter
Drive
10 kW -90°
10 kW 0°
-1.6 dB 0°
-4.77 dB
0°
20 kW -90°
6 kW
RJ
LD
Reject load
sized to 1
cabinet
PB3
4.77 dB
10 kW -180°
30 kW
12 kW
RJ
LD
-4.77 dB -90°
-4.77 dB
-90°
-4.77 dB -180°
Ʃ
Ʃ
÷
÷
÷
3 dB
4.77 dB
3 dB
3 dB
All splitters and combiners external to
the power blocks are Hybrid type
Summary of Contents for Flexiva FAX 10KW
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