CDR-3250/80 TECHNICAL MANUAL
Issue 2.2 1-1
CHAPTER 1
GENERAL DESCRIPTION
1-1 INTRODUCTION.
This chapter contains an equipment description, equipment
supplied and required, storage data, tools and test
equipment, and a summary of safety precautions.
1-2 EQUIPMENT DESCRIPTION.
The CDR-3250 and CDR-3280 (figure 1-1) are multi-mode
digital signal processing (DSP) receivers with a frequency
range from 10 kHz to 30 MHz.
The receivers are operationally similar, but packaged in two
different configurations. The receivers contain individually
shielded modules mounted in a 19 by 3½-inch rack-mount
chassis (CDR-3250), or 8½ by 3½-inch desktop chassis
(CDR-3280). Two CDR-3280 receivers may be fastened
together (using an optional dual rack-mount kit) to
construct a standard 19-inch rack-mount configuration.
The receivers are controlled by a 19-button keypad and
main adjustment knob used to select the receiver
parameters. Five "soft keys" work in conjunction with the
vacuum fluorescent digital display immediately above the
soft keys.
In addition to soft key selections, the vacuum fluorescent
digital display provides a variety of data including channel,
mode, BFO setting, frequency, bandwidth, gain,
local/remote control, an RF level meter, an AF level meter,
and a FREQ meter. Additional information is displayed
depending on soft key selections.
By proper selection of parameters, the receivers can detect
a wide variety of signals. These include: amplitude
modulation (AM), on/off keyed (CW), upper sideband
(USB), lower sideband (LSB), independent sideband (ISB)
(suppressed carrier and independent), and frequency
modulation (FM). Frequency shift keyed (FSK) signals can
be demodulated as single sideband suppressed carrier
signals or as true FM signals.
The selected detector audio output is available on the
NORM 600-ohm balanced line, rear panel speaker
connection, or front panel PHONES jack. In all modes
except ISB, the FM detector output is available as a DC-
coupled video signal on a single-ended line. In ISB mode
the USB signal appears on the NORM audio output, while
the LSB signal appears on the ALT audio 600-ohm line. In
all other demodulation modes, the AM detector output
appears at the ALT audio output. This output may be used
for multiplexed direction-finding (DF) signal processors.
A PHONES jack on the front panel provides for connection
of an external speaker, or headphones. The audio level is
controlled by the front panel power/volume control. The
correct audio is automatically selected depending on the
receive mode. However, when the ISB receive mode is
selected, the operator must select either the normal (USB)
or alternate (LSB) audio for application to the jack.
Either an internal or external reference frequency may be
used. The external reference frequency is automatically
sensed and used when connected to the rear panel.
The receivers may be remotely controlled (optional) by a
companion RCU-3100 remote control unit (optional with
serial bus only) or by any suitable bus controller using
either an RS-232, or RS-422 serial interface bus, or an IEEE-
488 parallel interface bus.
1-3 SPECIFICATIONS.
Refer to table 1-1 for specifications of the equipment.
1-4 EQUIPMENT FURNISHED.
Table 1-2 lists the items furnished, and optional items.
1-5 STORAGE DATA.
Refer to Chapter 7 for storage data.
1-6 TOOLS AND TEST EQUIPMENT.
Table 1-3 lists recommended tools and test equipment for
operational level maintenance. There are no special tools
or test equipment required.
1-7 SAFETY PRECAUTIONS.
Safety precautions are presented in this manual preceded
by the word WARNING or CAUTION just prior to the
point where the hazard is likely to be encountered.
Warnings and cautions are defined as follows:
Courtesy of http://BlackRadios.terryo.org
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