Top Cover (Keying) Contro Ls - Yaesu FT-757GX Operating Manual

QV
AF OUT
This RCA jack provides constant, low-level audio
output from the receiver, unaffected by the AF
gain control setting, for data decoding mo dems
or similar applications. Output level is approxi­
mately 200 mV peak at 5 0 kilohms.
@
EXT SPeaker
This standard 1 /8-inch 2-conductor mini phone
jack provides for connection of an external speaker
with impedance of 4 to 16 ohms.
@
KEY
This standard 1/4-inch 3-conductor phone jack
accepts either a standard CW key or keyer paddles
(for the internal electronic keyer). A 3-conductor
plug must be used. Wiring connections are shown
on page 20. Open circuit voltage is +5 V DC, and
closed circuit current is 0. 5 mA.
@
RF OUT
This RCA jack provides low-level RF output from
an early stage of the transmitter, for exciting a
TOP COVER CKEYING) CONTROLS
CD
BREAK-IN
When the VOX switch on the front panel is in the
undepressed position, this switch selects between
CW sidetone (only) operation (SEMI position),
and CW full break-in QSK transmission (FULL
position). In this case, when this switch is set to
the S EMI position, no transmission will occur,
though the CW sidetone will be heard when the
key is closed. This is ideal for CW practice.
transverter such as the FTV- 700. Power level is
approximately -6 dBm (0 .1 Vrms) at 50 ohms.
®
+sv
This RCA jack provides 8 V DC at up to 100 mA
for the FTV-10 7 Transverter or other accessories.
The center contact is positive.
Note: Repairs to damage caused by exceeding the
current ratings of the accessory DC j acks
may not be covered by the warranty
policy .
@
+13.S V
This RCA j ack provides 13. 5 V DC at up to 5 00
mA across the center and outer contacts , for
powering accessories. The center contact is posi­
tive .
@)
GND
For best performance and safety , this terminal
should be connected to a good earth ground
through the shortest path possible .
I f the VOX switch i s depressed , this switch is
disabled, and CW semi break-in operation occurs.
Use the DELAY control on the rear panel to adjust
the transmit hang time.
®
KEYER
When this slide switch is set to the AUTO position,
the internal 4-bit keyer microprocessor is activate d.
To operate the keyer, an appropriate pad dle keyer
manipulator must be connected through a 3-
conductor phone plug to the KEY jack on the rear
panel. Set this switch to the MAN (manual) posi­
tion when using a straight key or bug. Either semi
or full break-in operation can be used with this
switch in either position .
@ SPEED
This slide potentiometer adjusts the keying speed
of the automatic keyer, when the KEYER switch
is set to the AUTO position and the keying paddles
are pressed. Slide this control to the right for
faster keying speed.
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