EasyManua.ls Logo

Potomac Instruments FIM-21 - FIM Calibration Procedure

Potomac Instruments FIM-21
35 pages
Save Page as PDF
Print Icon
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Loading...
www.SteamPoweredRadio.Com
SECTION
2.
OPERATION
(Cont.)
Table
2
-1.
Operating
Controls
and
;Indicators
(Cont.)
Control
or
Indicator
Function
GAJN
control
(R2)
Adjusts
gain
of
receiver
by
regulating
gain
of
IT
amplifier.
CAL
OSC
tuning
control
(Rl)
RCVR
tuning
control
(Cl)
FIELD
-
STRENGTH
meter
(Ml)
LIGHT
switch
(S3)
RF INPUT
switch
MHz
switch
(FIM-41
only)
(S7)
METER
switch
(s5)
Fine
tunes
calibrating
oscillator.
(Oscillator
frequency
coarse
tuning
is
pre-set
by
receiver
tuning
control
.)
Tunes
rece
i
ver
and
calibrati
ng
oscillator
by
rotating
capacitors
Cl
and C2. Fre-,-
quency
of
receiver
signal
is
read
on
dial.
Indicates
field
strength
in
volts
per
meter,
in
conjunction
with
full
scale
switch.
DJ.uminates
m
eter
and
dial.
Switches
receiver
input
to
loop
antenna
(ANT)
or
external
BNC
input
jack
(EXT).
Selects
frequency
band:
A.
~54
to
1.6
MHz
B.
1.6
to
5.0
MHz
Provides
either
logarithmic
(LOG)
or
linear
(LIN)
relation
between
meter
reading
and
re-
ceiver
input,
the
former
for
use
when
the
meter
is
to
operate
in
conjunction
with
re
-
cording
equipment
or
when
relative
measure-
ments
of
greater
than
one
decade
are
desired.
Replacement
of
batteries
is
described
in
the
maintenance
section
of
this
manual.
2.3
FIM
Calibration
The
FIM
should
always
be
calibrated
at
the
frequency
of
the
signal
to
be
measured.
This
eliminates
any
error
due
to
frequency
sensitive
components
in
the
circuits.
Calibrate
the
meter
as
follows:
1.
Place
or
hold
the
field
strength
meter
in
a
vertical
position,
with
the
top
surface
in
a
horizontal
plane.
Open
the
cover
and
swing
it
to
a
vertical
position.
2-2

Related product manuals