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is turned fully counterclockwise.
AGC
SWITCH
(11 on Figure 5)
The AGC switch controls the AGC (Automatic Gain Con-
trol) circuit giving the operator three choices:
OFF — It may
be desirable to turn
the AGC
off when
receiving a very weak signal.
FAST—
The
FAST
AGC
position
is designed
for use in
CW and FSK operation.
SLOW-— Use the SLOW AGC position for SSB.
MIC CONNECTOR
(12 on Figure 5)
The microphone connector
is four pronged, allowing use of
a PTT microphone.
Figure 4 shows how to wire the plug
on the microphone cable.
PHONES
JACK
(13 on Figure 5)
The headphones jack allows use of an 8 ohm set of head-
phones with a %"' phone plug attached.
When the phones
are plugged into the transceiver, the speaker is disconnected.
PLATE/LOAD
CONTROL
(14 on Figure 5)
The
PLATE
tuning control
is the smaller diameter
knob
®
®
®
©
extending
farthest
from
the panel.
This control adjusts
the plate tuning of the two 6LOQ6 final tubes.
The LOAD
control, the silver ring, adjusts the loading of the pi-circuit
of the transceiver.
DRIVE
CONTROL
(15 on
Figure 5)
The DRIVE tuning control tunes the 6GK6 driver and the
antenna mixer circuits.
RIT/XTAL
CONTROL
(16 on Figure 5)
This control serves two different purposes.
When the knob
is turned fully counterclockwise the fixed frequency oscil-
lator is turned
on.
If crystals have been installed
inside
the transceiver,
the fixed channel
selector switch
chooses
between the two channels.
Also, when the RIT lever switch
is turned on, this control tunes the TS-900's receiver.
The
RIT
circuit allows
the operator
to tune the receive
frequency more
than +2 KHz without changing the trans-
mit frequency.
BAND
SWITCH
(17 on
Figure 5)
This 6 position switch
selects all the necessary circuits to
tune the transceiver to the desired 500 KHz band, or WWV.
B. SELECT
SWITCH
(18 on Figure 5)
This auxiliary band switch selects the circuits to tune the
®
@
i)
®
200 mA 400
600
ma
METER
PLATE-@)-LOAD
DRIVE
IP
ORE
4
MW
ALC. MO HY
>
wd
10)
7 ope
>
PHONES:
t u n
t t s
D
MIC
PHONES
TUS 1 fee.
PSK
7 LSB
SSB
TRANSCEIVER
MODEL
TS-
———
ne
(2)
@
FIGURE
5.
Ty
RE ATT
HEATER
POWER
ReLEY,
2)
19
@
TS-900 Front Panel Controls.
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