Yaesu FT-902DM Instruction Manual page 20

Split-frequency con trol may b e ob tained with the
m e m ory sy stem or the FV -9 0 1 DM synthesized scan­
ning VFO. The switches involved in frequency
control are as follows :
This button recalls t h e mem orize d fre­
M R
quency for con trol of the transceive
frequency .
TX M R This but ton recalls the mem orized fre­
quency for con trol o f the transmi t fre­
quency .
RX M R This b u t t on recairs the mem orized fre­
quency for con trol of the receive fre­
quen c y .
VFO Frequency control is by m eans of the
in ternal VFO as controlled by the main
tuning kn ob .
E XT This switch selects the F V - 9 0 1 DM syn the­
\
" sized scanning VFO for f r equency con-
· "
' \
trol as follows : with the EXT and M R
buttons pushed , transceive frequency
control is by means of the e x t ernal VFO.
With the EXT and TX M R bu ttons
pushed , the
the transmi t rrequency while the in ternal
VFO controls the receive frequency .
With the EXT and RX M R b uttons
pushed , the extern al VFO con trols the
receive frequency while the internal
VFO con trols the tran smit frequ ency .
M
This button is used to store a frequency
in m e m ory . THE F REQU ENCY D I S­
PLAYED ON THE DIGITAL READ­
OUT WI LL
STO R E D WHEN
IS P R E S S E D . When the M button is
presse d , the frequency p reviously s tored
in memory will be de stroy e d . When the
power is turned o ff, the frequency is
lost from mem ory .
Note : Because of "round-off error" the digital
display and mem ory system m ay e x hibit
a 1 00 Hz difference b e tween the VFO
condition and the mem ory recall condi­
tion .
e x tern al VFO controls
B E THE F R EQUENCY
THE M B UTTON
Operation o f the memory sy stem is perhaps best
described by the use o f some example s :
( I )
You are opera ting on a net on 3 9 7 0 kHz and
must Q S Y d own 1 0 kHz to handle a piece of
traffic. With the VFO button depre ss e d and
the main dial on 3 9 7 0 kHz , p ress
now memorized. M ove the main dial down
to 3 9 6 0 kHz to h andle the message . When
finished, press MR for in stant re turn to 3 97 0
kHz . The main d ial may b e left at 3 9 6 0 kHz
if further QSY to that frequency is antici­
pate d . To return to 3 9 6 0 kHz , sim p ly p ress
VFO .
( 2 ) You are operating split frequency on 40
meter phone , and y ou hear DX 1 DX on 7 090
kHz , listening for calls on 7 2 05 kHz. With
the VFO b u t ton depre ssed and the m ain
dial on 7 09 0 kHz, p ress M to store 7 09 0 kHz
in memory , and p ress RX MR to lock the
receiver on 7 09 0 kHz . Turn the main tuning
dial to 7 20 5 kHz ; y ou will now be transmi t­
ting on 7 20 5 kHz and listening on 7 09 0 kHz.
To listen to the pile-u p on 7 20 5 k H z of
s.tations calling D X 1 DX, push VFO ; you will
now b e listening and transmitting on 7 2 05
kHz , and another p ress o f RX MR will re turn
y ou to 7 09 0 kHz for receive. I f DX 1 DX
should b egin to drift slightly in f r equency,
push TX M R and M to store 7 2 0 5 kHz in
memory and l o ck the transmitter on that
frequency . Place the main dial on 7 09 0 kHz
for precise tracking of the unstable DX
signal .
(3 ) You find D X 1 D X on 2 1 2 7 0 kHz , wo rking
station s by order of call area. By p re ssing the
M button, 2 1 27 0 kHz may be s tored in
memory and the operator may p e riodically
check to see if his call area is being ackno wl­
edged by pressing M R or RX M R .
Note : After the M bu tton is pu shed, the VCO
require s 1 0 seconds to s tabiliz e on the
memorized f r equency. If one of the MR
buttons is p u shed during this 1 0-second
period , some " d rifting" of the memorized
frequency may be observed .
-- 1 8--
..
M ;
3 97 0 is
I
DX