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GENERAL INFORMATION
1-1 PURPOSE AND FUNCTION: The TEN TEC RX-340 is an all-mode, general-
coverage receiver that delivers military-grade performance at off- the-shelf commercial
pricing. Powerful digital signal processing (DSP) and over 60,000 lines of intensive code
provide a level of performance and flexibility unattainable with conventional analog
circuitry.
The RX-340 may be controlled locally from the front panel, or operated remotely through
a RS-232 interface. Knobs, switches, and displays are arranged ergonomically into four
intuitive control groups. Frequency, Mode, and Tuning Rate are presented in 12.5mm
blue-green fluorescent characters on the receiver's main alphanumeric display.
Operating frequency is controlled by direct keypad entry or by a weighted main tuning
knob, with continuous coverage from below 50 kHz to 30 MHz. Ten step-tuning rates
are provided (from 1 Hz to 1 MHz) to accommodate a wide range of tuning requirements.
Display resolution is 1 Hz, and frequency stability is ±3 ppm over an operating range of
0-50 degrees C.
In addition to manual tuning, 100 channel memories are provided to retain and recall
operating frequency, mode, and other basic operating parameters. Sophisticated
programmable Memory-Scan (MScan) and F1-F2 frequency-scan (PScan) modes are also
provided, along with up to 100 frequency-lockouts and a rapid-access scratchpad
memory. A two-line alphanumeric display provides continuous presentation of the
receiver's Memory/Scan status, and a dedicated Memory/Scan knob facilitates menu
management and scan programming.
Signal amplification, filtering, and processing are divided between analog and digital
circuitry. Analog features include 1/2-octave front-end filters, ruggedized balanced
mixers, and triple-conversion design to ensure wide dynamic range and superior rejection
of unwanted signals. A sophisticated multistage Automatic Gain Control (AGC) system
provides 80 dB of control range ahead of the A-to-D converters plus an additional 40 dB
in DSP. A switchable attenuator and preamp expand signal-handling range to over 140
dB.
Digitally-controlled operating parameters include an adjustable, offset beat-frequency
oscillator (BFO), variable passband tuning (PBT), tunable notch filter (Notch), wide-
range squelch (SQL), and a variable noise blanker (NB). An extensive bandwidth (BW)
menu provides 57 standard-shape DSP filters ranging from 100 Hz to 16 kHz, plus an
added selection of fast filters for enhanced reception of delay-critical digital modes such
as SITOR. Three preset AGC rates (Fast, Medium, and Slow) are provided, along with a
unique Program Mode that supports fully-adjustable Attack, Hang, and Decay settings.
A momentary AGC-cancel switch (Dump) instantly restores full receiver sensitivity on
demand. A dedicated two-line alphanumeric display continuously presents operating-
parameter status, and a companion Aux Parameters knob adjusts selected operating
characteristics.
1-1
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