FAX 5/10/20/30/40KW
October 28, 2013
5
‐
19
888
‐
2720
‐
001
WARNING:
Disconnect
primary
power
prior
to
servicing.
Copyright
©2013,
Harris
Broadcast
STEP 6
Repeat
this
procedure
for
each
power
block
in
the
transmitter.
5.7.4
Exciter Power Calibration/Switchover Threshold
The
FAX
transmitter
does
not
measure
exciter
power
internally,
it
uses
a
dc
voltage
that
is
proportional
to
the
Exciters
RF
output.
This
voltage
is
in
the
Exciter
interface
cable
and
comes
in
for
each
exciter
in
the
system.
If
using
dual
exciters
each
exciter
will
require
calibration.
No
wattmeter
is
required,
the
FAX
is
calibrated
by
matching
it
to
the
exciters
front
panel
power
reading.
If
the
exciter
switchover
threshold
needs
to
be
set
or
adjusted,
first
verify
the
both
exciters
power
meters
match
the
power
meter
displayed
on
the
FAX
and
the
EXC
PWR
voltage
is
in
range.
If
necessary
do
the
Exciter
Power
Calibration
steps
before
proceeding
on
to
setting
the
switchover
threshold.
Exciter
Power
Calibration
STEP 1
Go
to
SETUP>EXCITER
SETUP.
The
exciter
selected
should
be
the
one
that
is
presently
on
‐
air.
STEP 2
Go
to
EXC
PWR
CAL
menu.
STEP 3
Ensure
Modulation
type
is
correct.
STEP 4
EXC
PWR
reading
should
be
in
the
range
of
1000
to
2000
mV.
If
not
go
to
the
exciter
and
set
the
scaling
for
forward
power
so
the
voltage
is
in
range.
Although
the
minimum
voltage
for
setup
is
100
mV
for
reliable
operation
of
this
feature
keep
the
voltage
in
the
range
stated.
STEP 5
Set
the
EPWR
CAL
value
to
match
the
exciter
power
reading.
Notice
that
this
reading
is
in
milliwatts.
Some
exciters
such
as
the
Flexstar
read
in
Watts,
so
2
watts
will
be
2000
milliwatts
STEP 6
Change
CALIBRATE
to
Yes
and
press
Enter
button.
STEP 7
Repeat
for
Exciter
B
if
required.
STEP 8
Exciter
Calibration
Complete
Exciter
Switchover
Threshold
Setup
(Dual
Exciters
ONLY)
STEP 1
With
the
transmitter
running
at
TPO,
navigate
to
SETUP>>TX
CONTROL
and
set
the
following:
•
APC
to
OFF
•
EXC
SW
MODE
to
MAN
•
EXC
ON
AIR
to
the
exciter
that
the
threshold
is
being
set
for
A
or
B
STEP 2
Navigate
to
SETUP>>EXCITER
SETUP
and
set
the
exciter
to
A
or
B
to
match
Step
1
STEP 3
Navigate
to
SETUP>>EXCITER
SETUP>>EXC
PWR
CAL
STEP 4
Lower
the
exciter
power
out
until
the
transmitter
has
reached
a
point
where
the
exciter
switchover
should
occur,
ie
75
%
of
TPO.
STEP 5
Verify
the
EXC
PWR
voltage
is
in
the
range
of
100
to
2000
mV.
Note
If the threshold is set when the voltage is outside this range the switchover will default to 40 % of exciter
power which will be near 0 Watts out of the the transmitter.
STEP 6
Change
the
SET
THRESHOLD
to
YES
and
press
ENTER.
STEP 7
Change
to
the
other
exciter
and
repeat
these
steps
for
switching
in
the
other
direction.
STEP 8
Reset
the
APC
to
ON
and
EXC
SW
Mode
back
to
Auto.
STEP 9
End
of
procedure.
Summary of Contents for Flexiva FAX 10KW
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