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GENERAL
OPERATION
The tuning procedure for this transceiver is not
complicated. However, care must be exercised
when operating this equipment so that peak
performance is obtained. The following paragraphs
describe the procedure for operating the FT-I 07M.
INITIAL CHECK
Before connecting the transceiver t o the DC power
source, be certaiii that a fuse o f the proper rating
is iii use. When iising the FP-107 or FP-l07E AC
Power Supply, be certain that the voltage specifi-
cation for the power supply matches your local AC
supply voltage.
FREQUENCY SELECTION
Frequency selection on the FT-107M is by means
of a digital as well as an analog display. The digital
display reads the true frequency, with accounting
for the carrier frequency. Therefore, n o recali-
bration of the display is necessary when changuig
modes. The calibrator is chiefly useful for making
receiver adjustments.
The digital display allows resolution t o 100 Hz,
while the- analog skirt on the main dial allows
1 kHz. One revolution of the main tuning dial
corresponds t o a frequency change of 25 kHz.
The marker signal may be used t o set the
5
kHz
marking of the analog dial skirt.
A further coarse frequency determination may be
made through the main dial window, which
contains a subdial calibrated every 5 0 kHz.
RECEIVE OPERATION
( l ) Connect a 50 ohm antenna t o the rear panel
ANT jack. Preset the controls and switches as
follows:
POWER
. . . . . . . . . . . . . . . . . . . . . . . .
O F F
VDX GAIN
. . . . . . . . . . . . . . . . . . . . . .
PTT
NB
. . . . . . . . . . . . . .
Fully counterclockwise
MODE
. . . . . . . . . . . . . . . . . .
Desired mode
. . . . . . . . . . . . . . .
WIDTH
1 2 o'clock position
A F GAIN . Adjust later for comfortable level
. . . . . . . . . . . . . . .
RF CAIN
Fully clockwise
APFINOTCH knob
...
12 o'clock position
BAND
. . . . . . . . . . . . . . . . . . .
Desired band
RXCLAR
. . . . . . . . . . . . . . . . . . . . . .
O F F
CLARIFIER
..........
12 o'clock position
f
M
FINE
.............
12 o'clock position
ATT
. . . . . . . . . . . . . . . . . . . . . . . . . .
O F F
APFINOTCH switch.
. . . . . . . . . . . . . .
O F F
AGC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F
NB/MARK switch
. . . . . . . . . . . . . . . .
O F F
METER
. . . . . . . . . . . . . . . . . . . . . . . .
VCC
(2) Tum the POWER switch ON. The nieter lamp
and digital display will becoine illuii~inated.
The meter needle should deflect to within the
VCC range at the right side of the meter scale.
(3) Adjust the A F GAIN control for a conifort-
able listening level. There is no "preselector"
t
'
o r other peaking required for this receiver,
because the preselector networks are all
preset.
(4) When pulse-type noise is encountered, t u m
the NB switch ON. Now, rotate the control
clockwise until the noise pulses are elimi-
nated. The best setting of the blanker for
(
overall receiver performance is one tliat just
eliminates the noise pulses, without being
advanced too far. No noise blanker will
eliminate all types of noise, but the FT-107M
blanker is a ,state of the art design that
provides
significantly
improved
blanking
capability over earlier designs.
(5) For varying the width of the I F passband,
t
rotate the width control. In the IF, two
8-pole crystal filters are used. One filter i s
fixed, and presents a boundary for the band-
width. The center frequency of the IF is then
varied across
the passband nf
thc
scsnnd
filter, using a mixing technique that results in
no change of pitch
on
the received signal.
The result is continuously variable bandwidth,
from 2.4 kHz down t o approximately 300
Hz.
This system is highly effective in eliminating
high-pitched "buckshot"
on SSB, as well
as interfenng CW signals.
(
The WIDTH system is defeated during AM
operation, and the received signal bypasses
the second I F filter.
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