Pulsar TCF-10B, System Manual, Page: 144 / 249

14.1 Receiver Module
Description
The TC–10B/TCF–10B Receiver Module passes
the RF signal (from the RF Interface Module)
through a low-pass filter and attenuator to the first
mixer, whose injection is supplied by the
frequency synthesizer. The output of the first
mixer, at 5.02 MHz, is fed through the first
amplifier to a crystal bandpass filter that provides
most of the receiver selectivity. The IF signal,
after passing through the second and third ampli-
fiers, is mixed (at the second mixer) with the 5
MHz reference from the crystal oscillator, is
filtered (bandpass filter) and buffered, providing a
20 kHz output.
The TC–10B has two Receiver bands; the
TCF–10B has three Receiver bands for a variety
of applications, as shown in Table 14-1 (see the
Schematic, Figure 14-3 and Figure 14-4, and Parts
List for further detail).
14.1.1 Receiver Control Panel
(This panel is shown in Figure 1-1.)
Operator controls are as follows:
Thumbwheel switches
The Receiver Control Panel’s thumbwheel
switches have indicator windows showing a
frequency range.
Potentiometer
The potentiometer (R3), LEVEL ADJUST attenu-
ator adjusts receiver input (receiver margin
sensitivity).
Test Jacks
TJ2 RCV blue
TJ1 INPUT yellow
TJ3 COM green
Copyright © 1997 Pulsar Technologies, Inc.
Chapter 14. Receiver Module & Synthesizer Module
14
Schematic 1606C32-21
Parts List 1606C32-21
Group TCF-10B TC-10B
G01 (1,200 Hz) Extra Wide Band Wide Band
G02 (600 Hz) Medium/ Wide Band Narrow Band
G03 (300 Hz) Narrow Band —
Table 14–1. 1606C32 Styles and Descriptions.