DRAKE TR-4CW - Page 34

DRAKE
Table 5—2,. Voltage Chart (continued)
Transistor MEASURED AT:
|
Type Emitter
Collector
2N5950_| Located in PTO
2N3563 Located in PTO
Q3_| aATsos9 | 0 0 _|
Q4 | 2N3394 + 0 11.2 |
Q5_| 2N3877 2.3 2.8
NOTE:
All measurements were made with an 11 Megohm VTVM and were taken from ground. RF TUNE,
PLATE
and
LOAD
controls
were
set
as
described
in
paragraph
3-7.
BAND
switch
was
on
7.0
MHz,
VEO
dial
was
at
7.250
MHz
and
SIDEBAND
was
on
X.
Receive
measurements
were
made
with
the
Mode switch in the CAL position and the transmit measurements were made with the Mode switch
in the X-CW position, with the following exception:
On
V14,
both
receive
and
transmit
measurements
were
made
with
the
Mode
switch
in
the
X-AM
position and with PTT line grounded.
The
AC—4
Power
Supply
was
used.
Where
two
voltages
are
shown,
the
top
is
for
receive
and
the
bottom
is
for transmit.
An
‘‘*”
indicates
AC
voltage.
The
accessory
34—PNB
jumper plug
was
in
the
noise blanker jack.
5-13. RECEIVER IF.
a. Peak the RF TUNE control on noise at 3.8 MHz.
b. Adjust T1l top and bottom and T12 top and
bottom for maximum noise from the speaker.
5-14.
BALANCED
MODULATOR
AND
CARRIER
BALANCE.
a.
Disconnect
the
power
supply
and
reconnect
the
screen
and
plate
supply
leads
to
the
final
ampli-
fier
tubes.
b. Reconnect power supply.
c.
Connect
dummy
load
to
the
antenna
jack.
d.
Peak
the
RF
TUNE
control
for
maximum
receiver gain.
_
Adjust
bias
per
paragraph
3-6.
With
XMIT
GAIN
fully
counterclockwise,
place
the
Mode
switch
in
X—CW
position
and
SIDEBAND
switch
in
X
position.
.
If
the
plate
current
exceeds
0.15
Ampere,
adjust
the
RF
TUNE
for
0.15
Ampere
maximum.
_
If
plate
current
is
less
than
0.15
Amperes,
adjust
Carrier
Balance
pot
until
plate
current
reaches
0.15
Amperes.
Peak
T14
for
maximum
plate
current.
Detune
the
RF
TUNE
control
to
prevent
plate
current
from
exceeding
0.15
Amperes.
i.
Alternately
adjust
the
Carrier
Balance
control
and
C127
for
minimum
plate
current.
There
should
be
no
difference
in
plate
current
between
the
two
positions
of
the
SIDEBAND
switch.