5-1
CHAPTER 5
CIRCUIT DESCRIPTIONS AND ILLUSTRATIONS
5.1 INTRODUCTION The following sections contain detailed circuit board subassemblies
used in the model 417. Also included are circuit trace drawings and detailed component
layout diagrams. These drawings are followed by a schematic diagram for the complete
amplifier.
5.2 INPUT MATCHING BOARD A6
(81946)
This board contains the input
filter, impedance matching networks,
and
ALC circuits.
The 15M INPUT FILTER BOARD A7
(81953) is the standard input filter shipped
with the TITAN III. This is a five pole
elliptic filter consisting of L1, L2, L3, C1,
C2, and C3. This filter provides increased
roll-off of frequencies above the 15 meter
band. An optional 15/10M INPUT
FILTER BOARD A8 (81954) is available
from TEN-TEC to qualified amateur radio
operators, upon receipt of a copy of their
amateur radio license.
Note: Operation on the 10 meter band
will also require additional modifica-
tions to the bandswitch assembly. Please
contact the factory for instructions or
further information.
The impedance matching network of
R4–R12 and L3 on assembly A6 matches
the input impedance of the 4CX800As to
the input filter board.
The ALC circuit on A6 samples the
input RF power to the amplifier. A6D1
rectifies this sample and produces a
negative voltage proportional to input
power for control of some exciters. The
ALC threshold is set by potentiometer
A11R52, located on the rear panel. Turn
this control fully clockwise if ALC is not
used.
Summary of Contents for TITAN III 417
Page 19: ...2 6 BAND FREQUENCY LOAD TUNE ANTENNA NOTES FIGURE 2 2 MODEL 417 TUNING LOG ...
Page 20: ...2 7 FIGURE 2 3 TITAN III FRONT VIEW FIGURE 2 4 TITAN III REAR VIEW ...
Page 21: ...2 8 FIGURE 2 5 TITAN III TOP VIEW ...
Page 22: ...2 9 FIGURE 2 6 TITAN III BOTTOM VIEW ...
Page 40: ...5 15 FIGURE 5 21 SCHEMATIC DIAGRAM MODEL 417 ...
