( C ) FIN AL AMPLIFfER
The signal from the transm itter second mix er i s fed
to the grid of tran s m i tter d r iver V l .
1 2BY7A
w here
it is a m p l i fied to a level su fficient to d rive the final
l inear a m p l i fier V 2 and V3 .
6JS6C.
The sign al appear
ipg across Tl03 and T l 05 is cou pled to
the grids
V 2 and V3 . Neutral ization of the pow er am p l i fier i s
acc ompl ished b y feed i ng b a c k a small amount of t h e
output through
TC27
to the bottom of T l0 3 / T l 0 5
com bination. F inal o u t p u t from
V2
and V 3 i s fed to
the antenna. The output RF vol tage is d iv ided by
C 2 8
a n d
C29.
a n d is recti fied
by D4 .
1 S 1 007
to i n d icate
relative output power w hen the m eter sw itch is i n the
PO position.
The
ALC
( automatic level con trol ) vol tage i s obtained
by 02 and 03 .
1 S 1 5 5 5
and cont rol s the gain of the
I F ampl i fier.
FUSE
HOLDER
POWER T RAN SFORMER CONNECT IONS
Q6
2 S K I
9GR
C l 3
C l 9
CXl
a::
PB ·
1 534
I
1--9
OUT
( 1 1 ) M ET E R I N G
The meter circuit is designed t o ind icate signal strengt h
i n the receive mode. On tran smit. the m eter m a,·
be
switch selected to i n d icate cathode cu rrent. relative
Pow er Output , and automatic level con t ro l . T h e m eter
fu nctions are autom atically s w i tched by m eans of relay
C')ntacts for transmit and receive m odes.
A LC
meter reading is obtained from th e source
voltage of
Q6,
2SK 1 9GR
which varies in ac
cordance with the
ALC
voltage derived from the
final amplifier grid circuit.
For the EE and EX models, the meter reads the
variation of the source voltage of
Q l ,
2SK 1 9GR
in the modulator unit.
I n the
IC
position. the met.er i s conn ected to the cathodes
of final tu bes in paral lel w ith shunt resistor
R l 2 .
and
measu res total cathode cu rrent of the tubes.
In the
PO
position. the relative power output is indicated
by the rectified
DC
current at the pi output circuit.
The m eter sensitiv ity is adj u sted by potentiometer
VR6
located on the rear panel.
W hen the transceiver is in the receive mode. the
AGC
vol tage developed by the signal is fed to the meter
ampli fiers
Q4
and
Q5
to prov ide a meter defl ection
proportional to input signal strength. The meter is
cal i brated in the customary
" S "
u n i ts.
A
meter indi
cation of
S-9
represents approx imately
5 0
m icrovolts
at the antenna term inals.
-
1 9
-
C23
LB
�7
I
,
I
:
A9
1 3.SV 2
M J - 3 1
P B -
I 1 83
