most readable point without affecting your trans
mitting frequency. Its use is particularly valuable
in "net" operation where several participants may
be transmitting sligh tly off frequency. The clari
fier control functions with the clarifier switch ( 7)
set to the push-down position, and a red warning
lamp lights up. With the clarifier switch out
position, the red lam p turns off and the receiver
is locked to the transmitting frequency.
Normally, y ou will want to keep the clarifier in
the OFF position until the initial contact is made.
The clarifier control may then be used to zero-in
and correct the any drift on the received signal.
( 8) PRESELECT ;
This control pre tunes the signal circuits for both
transmit and receive. The preselect circuit pro
vides continuous permiability tuning throughout
the frequency range of the transceiver.
( 9 ) MIC GAIN/CARRIER;
The MIC GAIN/CARRIER controls are mounted
on concentric shafts. The carrier control (lever
control) varies the amount of the carrier in the
CW, AM and TUNE modes of operation.
The MIC GAIN control (round knob) varies the
audio level from the microphone amplifier stage.
The control has sufficient range to permit the use
of any high impedance crystal or dynamic micro
phone. Both. controls have maximum gain with
the control set at 1 0 ( fully clockwise).
( 1 0) PLATE ;
Tunes plate circuit of the final amplifier.
( 1 1) LOADING;
Tunes the output circuit of the pi network to
match anl:enna and feed line impedance.
( 12) LEVEL
This controls the output level of the RF processor
with the RF processor on.
(A) POWER
Main switch turns transceiver "ON" for both AC
and DC operation.
(B) HEATER
With this switch
m
the down position, the
transmitter tube heaters are turned off. This
reduces battery drain to 0. 5 amp and thus
permits long periods of listening without exces
sive battery drain. Pushing the rocker switch to
the upper position provides supply voltage to the
tube heaters. After a 30 second warm-up, the
transmitter is ready for operation. This switch
operates in both DC and AC modes.
7
(C) MOX-PTT-VOX
(FUNCTION SWITCH)
This slide switch selec ts desired transmitter m ode
for both microphone and key operation.
MOX-(Manual transmit switch position)
Locks transmitter "ON" and must be returned
to PTT p osition for receiver recovery.
PTT- (Push-to-talk) '
Locks transmitter "ON" when microphone
switch is depressed. Receiver recovers auto
matically when microphone switch is released.
VOX-(Voice operated transmit or break-in CW
operation:)
This switch position allows the operator to
ac tuate the transmitter by simply speaking
into the microphone. Receiver recovers auto
matically when the operator stops speaking.
For break-in CW, the VOX system will actuate
the transmitter each time the key is depressed,
and receiver recovers each time key is released.
(D) PROCESS
RF speech processor is placed into the circuit to
increase the modulation power with this switch
ON position.
(E) NB (NOISE BLANKER)
In upper position, the noise blanker is placed in
the circuit and eliminates noise pulses caused by
au to ignition.
( F) RF ATT (RF Attenuator)
This switch provides insertion of a 20 db attenu
ator in the incoming signal path to minimize
cross m odulation which may be caused by ex
tremely strong local signals.
(G) 25 KHz/ 1 00 KHz (CALIBRATOR)
The 1 00 KHz crystal oscillator is used to cali
brate the receiver. In the 2 5 KHz position, the 25
KHz multivibrator generates a marker signal at
each 25 KHz point on the dial. Clarifier control
must be in the "OFF" position when setting
calibration.
(H) PHONES
Headphone may be inserted in this jack for
private listening. The in ternal speaker is dis
connected when the headphone plug is inserted.
Any high quality head phone may be used.
(I) MIC
Microphone Jack. Four pin connector is used for
microphone input, and push to talk relay actua
tion.
(J) METER
Selects the meter mode to read PA cathode
cu(rent (LC.), relative power output ( PO), or
ALC feedback voltage . Lower meter scale is
calibrated 0 to .5 amp . Example: . 2 5
=
2 50mA
