Yaesu FT-1000MP Operating Manual page 55

Operation
Modes with the FT-1000MP
The FT-1000MP offers special features for
digital modes, such as a built-in digitally-synthe-
sized AFSK generator for R and AMTOR ter-
minal units, IF bandwidth optimization and
automatic display offsets, and an 18-ms transmit-
to-receive turn-around time. Note that the Sub
VFO receiver bandwidth is selectable between
6.0 kHz, 2.4 kHz and 500 Hz (optional YF-115C
required) in the RTTY and PKT modes.
Low-level Main Receiver audio ouput is pro-
vided from the rear-panel
RTTY
and
PKT
jacks, and
is unaffected by front panel volume control set-
tings. If you prefer to use Sub Receiver audio for
TNC input, switch
ssoo-i
(located on the AF UNIT
PCB between the
Dvsa
and
PKT
connectors) can
be moved from the
MAIN
to the
SUB
position.
Audio level is 100 mV from both jacks. The
RTTY level is fixed; however, PKT audio level can
be adjusted by
V R ~ Q I O .
In many cases, it is easier
to perform level adjustments at the TNC.
RTTY and AMBOR with a TNC
First determine if you will be using FSK or
AFSK operation with your TNC. Check with the
TNC documentation to determine if FSK opera-
tion is possible. With FSK operation, the FT-
1000MP generates the mark and space tones;
when using AFSK keying, your TNC will generate
the mark and space tones instead. Construct a
patch cable between your TNC and the appropri-
ate rear panel jack
(RTTY
for FSK,
PACKET
for
AFSK). Refer to the pin-out diagram below, and
the wiring instructions included with your TNC.
Connect your TNC to the jack you will use on
the rear panel, as shown below. Also, configure
RTTY menu selections 6-0-6-3 for the shift, polar-
ity, tone pair and display offset you will use. The
default settings for these selections are the most
common ones used, but may differ depending on
your operating requirements. A brief description of
RTW-associated settings are listed below.
RTTV Shift
-
Menu selection 6-0 chooses the
frequency shift between mark and space tones.
Amateur RTTY uses 170 Hz by convention, 850
Hz for MARS and other services.
I
Important Note!
-
if changing shift to other than
I I
170
Hz, be sure to re-calibrate the tuning meter as
outlined on page 72. The calibration routine is
simple, and ensures your center tuning indication
matches the new shift (tone pair).
Station Interconnections for Digital Modes
Y
RS-232C Serial
Interface Cable
AFSK Packet
Patch Cable
Patch Cable
Personal Computer
with Terminal Software
Package installed
Terminal Node
Controller Unit FT-1000MP
Transceiver
PACKET (AFSK)
DIN Plug Connections
PTT
RX AF OUT
Both jacks pin-outs appear as
viewed looking at the rear panel.
SHIFT GND
* Level adjustable
via VR3010.
page 53