Yaesu FT-901DM Maintenance Service Manual page 16

the internal speaker will be disabled when plug
is inserted.
(16) PTT
This jack may be used for external actuation of
the transmitter. As an example, a footswitch may
be connected to this jack to provide remote con-
trol of the transmitter relay, leaving the operator's
hands free for writing and tuning purposes.
(17) FSK
Input from the FSK terminal may be made
through this jack. The FT-901DM is set up for
170 Hz shift.
(18) IF OUT 1
Narrow bandwidth 8.9 MHz IF output is avail-
able for use with an IF monitorscope. etc.
(19) REMOTE
Provides switched 13.5 VDC for relay control
for external low-pass filter units, etc. As the band-
switch is rotated, 13.5 VDC will appear at various
Pins on the REMOTE jack. Use a VOM to deter-
mine the proper pin for the band in use.
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External speaker
GENERA!
Pin plug
PIN No
1 VFO our
2 GNo—
3 EXT 6VIN
4 AGC IN
5 TXI2VIN
6 Sai,
VFO plug