Swan Electronics SWR-1 User Manual

5. The relationship
SWR-
I
is as fol
Frequency
(MHz)
between
the minimum
input
power
Iows.
The Minimum
Input Porver
(watts)
and freqency range
in order
to
measure
SWR
by
Model
3.5
7
t4
21-28
50-150
Frequency
--*'.--
-
I
3.5MHz
7
14
2l
28
50
\
50w tOw
I
15
7.5
4
2
1
*
RF Power
Measurement
*
7.
Connect
correctly Model
SWR-1,
transmitter
and antenna.
Z.
Sensitivity of
directional coupler
depends on
frequency so
that
requires
to calibrate the
center
adjusting
knob
on
each frequencies.
The standard
calibration
points
up to
50MHz
are shown below.
100w
4.7
2.0
1.3
7.2
1.0
l
l
I
l
5w
6.1
2.8
1.5
1.3
1.2
1.5
1.8
3.
Turn
on the
output of
transmitter.
POWER Meter
swings
and its
indication shows
the
power
when
it's cali-
brated. POWER
Meter
is scaled for
5o
watts and
100
watts,
divide it by
l0
for
10
vratts and
5
watts scale.
4.
POWER
Meter indicates the
travelling wave
power,
so
the correct output
power
cannot
be
measured
if
SWR is
too
high. Measure after
you
confirm the
SWR
figure
less
than
1.5.
5.
SIYR measurement
cannot be donc
when
you
measure
RF
power.
*
CAUTION
x
1.
Never disconnect
the the
connecter
of
Model SWR-1
Ieading to antenna when transmitter is on. Model
SWR-1
may
be burned and
spoiled.
2.
Sometimes abnormal
voltage is found
at a certain
place
of
the
feeder when transmittcr and
antenna circuit
are
mismatching.
Do not
connect
Model
SWR-1
in
such a case.
The
safety limit of Model
SWRI-
from
the view
point
of transmitting
power
and
SWR figure is
shown
in the
table
below. Cut
off the output
power
of transmitter
immediately
and do not use
Model SWR-1
when the shown figure
is
exceded.
lransmitting
Power
1kw
500w
300w
IRANSMITIER
c,
<o
=
10K
o
@
z.
-llooop
*
SCHEMATIC
OF
MODEL
SWR-1
r0K
1.
1
1.5
.J.
('
o
tf,

Swan Electronics SWR-1 Specifications

General

Brand	Swan Electronics
Model	SWR-1
Category	Measuring Instruments
Language	English