Yaesu FT-901DM Instruction Manual page 20

Split-frequency control may be ob tain e d with the
memory sy stem or the FV-9 0 1 syn the sized scan­
ning VFO. The switches involved in frequency
control are as follows :
This button recalls t h e mem orized fre-
M R
quency for
frequency .
This button
TX M R
quency for control of the transmit fre-
quency .
RX MR This button
control of the receive fre-
quency for
quency .
Frequency control is by mean s of the
VFO
internal VFO as controlled by the main
tuning kn ob .
This switch selects the FV-9 0 I synthe­
EXT
sized scanning VFO for frequency con­
trol as follows : with the EXT and MR
buttons pushed ,
control is by means o f the e xternal VFO.
With the EXT and TX MR buttons
pushed , the
the transmit frequency while the in ternal
VFO c ontrols the receive frequency .
With the EXT and RX M R buttons
'
pushed , the extern al VFO con trols the
receive frequency while
V FO con trols the transmit frequency.
M This button is used to store a frequency
in memory . THE F REQUENCY DIS­
PLAYED ON THE DI GITAL READ­
OUT WILL
STORED WHEN
I S PRES SED . When the M button is
pressed , the frequency previously stored
in memory will be destroye d . When the
p ower is turned o ff, the frequency is
lost from mem ory .
Note : Because of "round-off error" the digital
display and memory system m ay e xhibit
a I 00 Hz difference b e tween the VFO
conditi on and the mem ory recall condi­
tion .
the transceive
con trol of
recalls the mem orized fre-
recalfs the mem orized fre-
transceive frequency
e x ternal VFO controls
the in tern al
BE THE F REQUENCY
THE M B UTTON
Operation of the memory system is perhaps best
describ ed b y the use o f some e xample s :
( 1 ) You are operating on a net on 3 9 7 0 kHz and
must QSY d own I 0 kHz to handle a piece of
traffic. With the VFO button depressed 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 9 6 0 kHz to handle the message . When
finished, press MR for instant re turn to 3 9 7 0
kHz. The main d ial may b e left a t 3 9 6 0 kHz
if fu rther QSY to that frequency is antici­
pate d . To return to 3 9 6 0 kHz, simply press
VFO.
( 2 ) You are operating split frequency on 40
meter phone, and y ou hear DX I DX on 7 09 0
kHz, listening for calls on 7 20 5 kHz. With
the VFO button d epressed and the m ain
dial on 7 09 0 kHz, p re ss M to store 7 0 9 0 kHz
in memory , and press RX MR to lock the
receiver on 7 09 0 kHz. Turn the main tuning
dial to 7 20 5 kHz ; you will now b e transmit­
ting on 7 20 5 kHz and listening on 7 09 0 kHz.
To listen t o the pile-u p on 7 20 5 kHz of
stations calling DX I DX , push VFO ; y ou will
now b e listening and transmitting on 7 2 05
kHz, and another p re ss o f RX M R will return
you to 7 09 0 k Hz for receive. If DX I DX
should b egin to drift slightly in frequency,
push TX M R and M to store 7 2 05 kHz in
memory and lock the transmitter on that
frequency. Place the main dial on 7 0 9 0 kHz
for precise tracking of the unstable DX I DX
signal.
(3) You fin d DX I DX on 2 1 2 7 0 kHz, working
station s by order of call area. By pressing 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 b eing acknowl­
e dged by pre ssing M R or RX M R .
Note : After the M button i s pu shed, the VCO
requires
memorized frequency . If one of the MR
buttons is pushed during this I 0-second
period, some "drifting" o f the memorized
frequency may be ob served.
- 1 8 --
I 0 seconds to s tabilize on the