Yaesu FT-902DM Instruction Manual page 19

on . the rear panel. The FT-9 02DM is se t up for
1 7 0 Hz shift , and the shift frequency may b e ad­
justed some what by m e ans of the trimmer capaci­
tors located under the top cover. The CARR c on­
trol mu st b e adjusted in the TUNE p osition for
not m o re than 1 00 niA . Ex cessive cathode current
may result in damage to the final amplifier tube s .
Audio output fr o m the transceiver m a y be taken
from the SP j ack in the rear apron.
F M OPERATION
The FM Unit is built-in on the F T - 9 0 2 D /
Note :
D M , a n d is an available accessory on the
FT-9 02D/DE m o dels.
After completing the b asic transmitter tune-up ,
set the CARR c on trol for 1 00 mA carrier level
in
the F M mod e . Speak into the microphone in
a norm al voice . The MIC GAIN and PROC LEVEL
controls h ave no ef f ect in the FM mode .
For FM reception, the SQL control on the front
panel should be advanced only as far as required
to silence b ackground noise. When adjusted just
past the silencing threshold , the squelch circuitry
will p rovide noi se-free recep tion with m aximum
sensitivity to weak FM sign als.
In areas of very high occu p ancy , where channels
are crowde d , an additional FM crystal filter is an
available option.
DIAL CALIB RATION AN D FRE QUENCY
DETERM INATION
The FT- 9 02 DM m i xing scheme accounts for the
difference in carrier frequencies between USB and
LSB. F o r this reason , no re calibrat ion is require d .
On ce t h e calibration i s properly aligned (at the
factory , or in shop ) , n o further adj ustment is
required for accurate frequen cy derivat ion . The
2 5 kHz or 1 00 kHz calibrator is in cluded largely
for alignm ent p urp o se s , as it p rovides a usefu l
re ference signal for signal p eaking, et c.
Frequency reado ut on the
display is straightforward .
frequen cy is d isplay e d , with resolution to 1 00 Hz.
FT-9 02DM digital
The full operating
-- 1 7 -
The analog display o n the transceivers p rovi d e s
easy determination of the operating frequency .
The frequen cy disp l ayed o n
is added to the lower band edge f r equen cy .
For example , i f .the analog dial indicat e s 074, a s
shown i n t h e e x ampl e , and t h e BAN D swit ch is o n
40 meters (lower b a n d edge : 7 0 0 0 kHz ) , t h e
operating frequency will b e 7 0 74 k H z . By rot at in g
t he B AN D swit ch , t h i s position of t h e analog
display will p ro du ce 1 4074 kHz for 2 0 m eters ,
2 1 074 for 1 5 m e ters , etc. For 80 a n d 1 2 m eters, t h e
lower band e dges are 3 5 00 kHz an d 2 4 5 00
while for 1 60 m eters the band edge is 1 . 5 M H z .
Th ere fore , the d i al should read 074 t o p ro d u ce
3"5 74 kHz , b ut 3 74 for l 8 7 4 kH z . B e care ful so a s
n o t t o o perat e outsid e the amate ur b a n d s .
SELECT SWITCHES / ME MORY SYSTEM
OPERATION
(Note : The memory unit is b uilt-in on the DM
m o d e l , op tional on the D/ S D/DE model s )
Frequency control o f t h e FT-9 02DM is b y m e an s
of the intern al V F O , the me mory uni t , an e x­
ternal V F O , o r various combination s o f the thre e .
the analo g sub dial
k H z,