a.
b.
C.
d.
e.
With the TR-4C connected to the linear ampli-
fier tune the RF TUNE control as described in
paragraph 3-7 g.
Set the LOAD control to the setting indicated on
the chart below, for the band desired, when
using a linear amplifier with a 50 ohm input.
50 Ohm LOAD
BAND
Setting
3.5 MHz
2
7.0 MHz
3
14.0 MHz
2
21
.O
MHz
3
28.5 MHz
2
Tune the PLATE control for minimum plate
current.
Switch the Mode switch to the desired mode of
operation.
Advance the XMTR GAIN control until the
desired amount of input to the linear amplifier
is obtained.
Note that when the TR-4C is loaded much below
maximum RF output the AGC does not function
properly and flat topping in the TR-4C may result.
Care should be taken to keep the XMTR GAIN
below the point where this occurs. This can be
accomplished by making sure that the average peak
plate current does not exceed one half of the plate
current obtained on tune up.
If your linear amplifier has AGC output, connect
it to the TR-4C as shown in figure 2-7. If the
TR-4C is properly tuned, this should prevent flat
topping on SSB regardless of the XMTR GAIN
control setting. However, it will not prevent over-
drive on AM since the AGC does not function in
this mode.
3-13. NOVICE OPERATION.
If used on the novice bands with crystal control or
VFO control, maximum legal input power is 75
Watts which occurs when the Plate Meter reads
0.1 15 Ampere. To realize the most useful output
under these conditions, readjustment of the Bias
control on the Power Supply is suggested. Follow
the Bias Adjustment procedure in paragraph 3-6,
except set bias control on AC-4 for minimum
readable plate current. If the transceiver is used on
both novice band and by another operator on SSB
or AM, the bias must be readjusted to itsformer
value before such operation is attempted.
To load the transmitter for novice operation, preset
controls as described in paragraph 3-6. Turn the
MODE switch to X-CW and advance XMTR GAIN
for a very slight increase in plate current. Tune RF
TUNE for a peak in plate current, being careful not
to exceed 0.115 Ampere, and quickly tune PLATE
control for a dip in plate current. Turn XMTR
GAIN control fully clockwise and adjust LOAD
control until plate dip occurs at 0.1
15
Ampere. If
plate current dip is higher than this when LOAD
control is set to 0, reduce the XMTR GAIN for
plate reading of 0.115 Ampere. Turn MODE switch
to X-CW and set GAIN control for a plate current
of 0.1 15 Ampere.
3-7
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