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Potomac Instruments FIM-21 - Operation; Controls and Indicators

Potomac Instruments FIM-21
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SECTION
2.
OPERATION
2.1
General
The
FIM
- 21 and FIM-4l
operating
controls
and
indicators
are
de
-
scribed
in
this
section.
Also
provided
are
the
basic
operating
instructions
which
include
battery
voltage
testing,
meter
calibration,
meas
uring
field
strength,
and
use
of
these
instruments
as
null
detectors
fo
r
RF
Bridge
meas-
urements,
2.2
Operating
Controls
and
Indicators
All
operating
controls
and
indicators
are
located
on
th
e
front
panel
of
the
FJN-21 and FJN-41
as
shown
in
figure
2-1.
Table
2-1
lists
these
controls
and
indicators
and
the
associated
functions.
Table
2-l.
Op
erating
Controls
and
Indicators
Control
or
In
dicator
Function
FUNCTION
selector
switch
(S2)
FULL
SCALE
selector
switch
(Sl)
AUDIO
control
and
switch
(R3)
Selects
the
function
to
be
displayed
on
the
front
panel
meter
and
connects
battery.
OFF
-
battery
disconnected
from
circuit,
and
direct
connection
mad
e
across
meter
terminals
to
protect
meter.
BATT
-
battery
output
voltage
FI
CAL
TUNE
-
field
strength
of
antenna
input
de
veloped
from
dete
c
ted
output
of
receiver
IF
amplifier
.
CAL
NuJ.l - compares
detector
outputs
from
receiver
and
calibrating
oscillator.
S
elects
the
amount
of
attenuation
in
RF
and
IF
stages,
in
10
to
1 (20 db)
ratio
steps.
The
panel
is
marked
with
the
full-scale
direct-reading
field
strength
value
for
each
position.
CAL
-
applies
power
to
calibrating
oscil-
lator,
and
selects
1
volt
range
of
attenu-
ator.
Adjusts
level
of
audio
in
speaker
and
head
-
phones.
Switch
disables
audio
amplifier
in
OUT
position.
2-1

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