Yaesu FT-902DM, Instruction Manual

Page: 20 / 55

Split-frequency control may be ob tained with the
memory system or the FV-9 0 1 DM synthesized scan­
ning VFO. The switches involved in frequency
control are as follows :
M R This button recalls the mem orized fre­
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 transmit fre­
quency .
RX M R This button recairs the mem orized fre­
quency for con trol of the receive fre­
quency.
VFO Frequency control is by means of the
internal VFO as controlled by the main
tuning kn ob .
EXT This switch selects the FV-90 1 DM syn the­
\
" ·"
sized scanning VFO for frequency con-
'
\ trol as follows : with the EXT and M R
buttons pushed , transceive frequency
control is by means of the external VFO.
With the EXT and TX M R bu ttons
pushed , the e xtern al VFO controls
the transmit rrequency while the in ternal
VFO controls the receive frequency .
With the EXT and RX M R buttons
pushed , the extern al VFO con trols the
receive frequency while the internal
VFO con trols the transmit frequency .
M
This button is used to store a frequency
in memory . THE F REQUENCY D I S­
PLAYED ON THE DIGITAL READ­
OUT WI LL BE THE FREQUENCY
STORED WHEN THE M B UTTON
IS PRESSED. When the M button is
presse d , the frequency previously stored
in memory will be destroye 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 memory system may exhibit
a 1 00 Hz difference between the VFO
condition and the memory recall condi­
tion .
Operation of the memory system is perhaps best
described by the use o f some example s :
( I)
You are operating on a net on 3 9 7 0 kHz and
must QSY d own 1 0 kHz to handle a piece of
traffic. With the VFO button depre ssed and
the main dial on 3 9 7 0 kHz , press
M ;
3 97 0 is
now memorized. M ove the main dial down
to 3 96 0 kHz to h andle the message. When
finished, press MR for instant return to 3 97 0
kHz . The main dial may be left at 3 9 6 0 kHz
if further QSY to that frequency is antici­
pated. To return to 3 96 0 kHz , simply press
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 7 205 kHz. With
the VFO button depressed and the main
dial on 7 09 0 kHz, press M to store 7 09 0 kHz
in memory , and press RX MR to lock the
receiver on 7 090 kHz . Turn the main tuning
dial to 7 205 kHz ; y ou will now be transmi t­
ting on 7 205 kHz and listening on 7 09 0 kHz.
To listen to the pile-u p on 7 20 5 kHz of
s
. tations calling DX 1 DX, push VFO ; you will
now be listening and transmitting on 7 2 05
kHz , and another p ress of RX MR will re turn
you to 7 09 0 kHz for receive. I f DX 1 DX
should b egin to drift slightly in frequency,
push TX M R and M to store 7 2 0 5 kHz in
memory and lock the transmitter on that
frequency . Place the main dial on 7 09 0 kHz
for precise tracking of the unstable DX
I
DX
signal .
(3 ) You find DX 1 D X on 2 1 27 0 kHz , working
station s by order of call area. By p ressing the
M button, 2 1 27 0 kHz may be stored in
memory and the operator may periodically
check to see if his call area is being acknowl­
edged by pressing M R or RX M R .
Note : After the M button is pu shed, the VCO
requires 1 0 seconds to stabiliz e on the
memorized frequency. If one of the MR
buttons is pushed during this 1 0-second
period , some "drifting" of the memorized
frequency may be observed .
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