ORDER NO.,
421A
The Power Meter
is a high
quality,
compact,
easy
to in-
stall
instrument.
It will
measure
the VSWR of an antenna
directly
on
the
meter
without
an
inter-pol
ation
chart,
percentage
of
modul ation
to over
100% and power
output
in 3 ranges
up to 500 W.
The
Power
Meter
was
designed
for
maximum
operating
convenience
and
as
such
consists
of
two
parts.
The
modern
style
Indicator
unit
can be placed
In a convenient
position
while
the
Sensor,
which
is placed
in
the
line
between
the
transceiver
and the
antenna,
can
stand
or
hang behind
the transceiver.
This
alleviates
the need to
run coaxial
cables
across
the operating
desk.
The Indi~
cator
and Sensor
units
are hooked
together
with
the inter-
connection
cable
suppl ied.
Hei ght. ,
3"
Wi dth
7"
Depth ....•.•...
"
5 1/8':
Net Weight
,
, . 1 1/2
Ibs.
Construction
Lightweight
aluminum
chassis
with
rugged steel
case ..
Total
Shipping
Weight..
, .. ,
, .. 3 1/4
Ibs.
Impedance
50 Ohms Input
and Output
Connector
Data
Sensor and Indicator
hooked
together
with
4 foot cable
supplied
Power Ranges
Three power
ranges from 0 to
10,100 and 500 watts
Modulation
Measures
percentage
of
modulation
to over·100%
VSWR
, . '"
:
Measures
VSWR of antenna
Frequency
Range
,
, ....•.
3- 60 MHz
()
Carefully
remove
the
Indicator
and Sensor
units
from
the packing
carton.
Examine
it closely
for signs
of ship-
ping damage.
*See last paragraphs
in this
manual.
()
Connect
the
Sensor
unit
between
the Transceiver
and
antenna,
being
careful
to connect
the coaxial
connector
on the short
length
of coaxial
cable
to the output
of the
Transceiver.
Connect
the antenna
to the
SO-239
socket
on the Sensor.
Assuming
that
the Power Meter has been installed
as out-
I ined
above,
proceed
as follows
to measure
the VSWRof
the
antenna.
Rotate
the Ca librate
control
full y co~nter-
I NSlAlLAI'IO;N'&
o
PERAllO N INSTRUCTIONS
. H,{~GAtA
ELECTRONics
CORPORATION'
4
fturat
Route
3
l.incoln:
Ne6raska·6'S5Q5: '~"
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"",,"~
,
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I,
,',
,
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'@~
cfockwi
se,
switch
the
Function
?witch
to FWD (forward),
key
the
Transceiver
and adv(1)Ce the
Cal ibrate
control
unti I the
meter
reads
full
scal e(jus.i
to the
end of the
cal ibrated
scales,
nofurther).
Switch
the. Function
Switch
to SWR and the VSWR of theantennaca.n
.be read directly
from the SWRscale.
Unkey the Transceiver.
Before
measuring
the percentage
of modulation,
check
the
VSWR of the antenna
as outl i ned abOve.
The VSWR should
be less
than
1.5 to 1 for the percentage
of modulation
to
be correct
(it will
indicate
modulation
with a higher
VSWR
but not accuratel
y).
Set Function
Switch
to FWD, Cal ibrate
full
counter-clock-
wise,
key the Transceiver.
Advance
the Calibrate
control
to
full
sr.al e defl ection ,swi
tch
the
Function'
Switch
to
MOD.
Talking
or whistling
into the microphone
witl
now
give
a percentage
of modulation
on the meter.
Adjust
the
distance
between
the
microphone
and the mouth
so that
on words
I ike
"five"
the percentage
of [nodulation
does
not exceed
100%.
Unkey
the Transceiver.
The Power
Meter
Will
measure,'uslng.three
ranges,
the
power
output
Uf)
to'500
watts.
The VSWR should
be
less
than
1 b to 1 for thiS rneasurementto
be accurate.
When measuring
the pnwpr output
always
start on the high-
est
range (500w)
and then go down until
8
reading
is ob-
tained,
do not
let
the
meter
be pinned
full
scale.
The
Cal ibrate
control
does not operate
in the power position.
The Power
Meter
power
scales
are a factory
adjustment
internally
and should
not be adjusted.
DO NOT ship
equipment
to the Manufacturer
without
prior
a uthori zation.
We prefer
to send spec i a I shippi ng Iabe Is
whi ch wi II avo id the del ay of unexpected
shipment.
If time
is extremely
important,
wire
or call
for
approval
and we will
rush labels
to you.
When a shipment
is ex-
pected,
even the time
of sending
the labels
is less
than
that
lost when an unexpected
shipment
is received.
It is VERY IMPORTANT that
the
shipment
be well
packed
and fully
insured.
Damage claims
must be settled
between
you
and
the
carrier
and
will
greatly
delay
any returns.
Proper packing
normally
avoids
this
trouble.
ALL SHIPMENTS MUST BE SENT TO US PREPAID.
I'Ve do not
accept
collect
shipments.
All
returns
should.be
made in
our
standard
cartons
only
- so save your carton
when un-
