DRAKE TR-4CW - Novice Operation

a. With the TR—4C connected to the linear ampli-
fier tune the RF TUNE control as described in
paragraph 3-7 g.
b. 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
21.0 MHz 3
28.5 MHz 2
c. Tune the PLATE control for minimum plate
current.
d. Switch the Mode switch to the desired mode of
operation.
e. 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
DRAKE
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, maximum legal input
power is 250 Watts which occurs when the Plate
Meter reads .385 Ampere. To realize the most use-
ful output under these conditions, readjustment of
the Bias control on the Power Supply is suggested.
Follow the Bias Adjustment procedure in para-
graph 3-6, except set bias control on AC—4 for
.025 Ampere plate current (one fourth of the
normal setting). If the transceiver is used on both
novice band and by another operator on SSB or
AM, the bias must be readjusted to .1 Ampere
before voice operation is attempted.
To load the transmitter for novice operation, pre-
set 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 .385 Ampere, and quickly tune PLATE
control for a dip in plate current. Turn XMTR
GAIN control fully clockwise. Adjust LOAD con-
trol clockwise and then redip the PLATE control.
This procedure should be done repeatedly in small
increments. Stop advancing LOAD control when
plate current reaches .385 Ampere with the
PLATE dipped, or when output power no longer
increases, whichever occurs first. Reduce XMTR
GAIN until plate current just starts to drop. The
transmitter is now ready for operation.