Digital Modes With The Ft-1000Mp; Rtty And Amtor With A Tnc - Yaesu FT-1000MP Operating Manual

Operation
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Digital 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 RTTY 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 $3001 (located on the AF UNIT
PCB between the DvS-2 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 VR3010. In many cases, it is easier
to perform level adjustments at the TNC.
PKT Audio Level Main/Sub
Output Adjust. Rx Audio Select
DVS-2 PKT RTTY
JACK JACK JACK
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RTTY and AMTOR 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. Abrief description of
RTTY-associated settings are listed below.
RTTY 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.
Important Note! - if changing shift to other than
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
AFSK Packet
Patch Cable
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RS-232C Serial
Interface Cable
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Personal Computer
with Terminal Software
Package installed.
PACKET (AFSK)
GND
DATA Me ~ BUSY
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x DATA IN
:
PIT
* Level adjustable
via VR3010.
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Terminal Node
Controller Unit
Both jacks pin-outs appear as
viewed looking at the rear panel.
FSK RTTY/AMTOR
Patch Cable
FT-1000MP
Transceiver
RTTY (FSK)
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SHIFT NS GND
DIN Plug Connections
page 53