TELETYPE RX MONITORING
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Set
0I010++
the YR-901 and station equipment as
shown in Figures 5 and 6. If it desired to use
a monitorscope such as the Y0-901. Multi
scope for cross pattern monitoring of the
RTTY signal, please refer to Figure 7 for
interconnection details.
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Preset the controls and switches as follows:
MODE .... 170 (for amateur 170
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shift)
TTY ...... 45 (45.5 Baud) or 50 (50 Baud)
F/L ...... OFF
AS ...... OFF
NOR/REV . NOR
A. START . OFF
Insert the 6-pin DIN plug into
�Jtp
---+<-I,
(rear
panel).
em�3estp
Tune in an RTTY signal, and adjust the
INPUT LEVEL control to obtain a full scale
deflection of the indicator LEDs. Now tune
in the RTTY signal in such a way as to obtain
equal illumination of the MARK and SPACE
LEDs.
( 4) Once the signal is properly tuned, advance
the INPUT LEVEL control fully clockwise.
B y now, you should be monitoring on the
television screen the incoming RTTY message.
(5) Observe the display on the monitor screen.
If it appears that the figure/letter relationship
is reversed, simply flip the F++ L switch to
reverse the relationship. See also the section
on ASCII Code and RTTY Code, Page 1 5 of
this manual.
(6) The AS (Antispace) feature will place the
teletype machine in the mark-hold mode if
the space signal exceeds
�2eO�0tp
ms in length.
This will prevent the teletype machine from
generating unnecessary noise. OSCAR satellite
transmissions may be received with this switch
on or off, incidentally.
(7) If you are using a receiver in which. the BFO
relationship is such that the MARK/SPACE
relationship is reversed, the NOR/REV switch
may be placed in the REV position, thus
allowing proper operation.
ESE'"'I,
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Fig.7
FT-901 DM/YR-901 /Y0-901 /TV
Teletype RX Monitor
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12
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