HF DSP Receiver - Model RX-330B

The TEN-TEC RX-330B is a multi-mode HF receiver operating from 10 kHz to 30 MHz, fully synthesized and utilizing state-of-the-art Digital Signal Processing. DSP technology brings the performance and repeatability of expensive military grade communications receivers into the more economic range of commercial receivers.

The design flexibility of DSP provides 57 standard selectivity choices from 100 Hz to 16 KHz. It is also practical to customize filter bandwidths, shape factors and time delays to match unique customer requirements.

The RX-330B is designed specifically for remote controlled applications. Multi-drop RS-232 interface permits simultaneous operation of multiple receivers on a single network at baud rates from 300 to 19,200. Receiver may be controlled by either internal or external frequency reference and an optional high stability internal reference is available.

This receiver is a compact, rack mount unit only 1 3/4" high - ideal when available rack space is at a premium. Power consumption is a nominal 30 watts which can provide a measured advantage when comparing recurring system costs. All connections are arranged on rear panel. Front panel provides ON/OFF switch, headphone jacks with independent volume controls, serial port status indicators and power supply indicators.

Built-in Test (BITE) allows quick field verification of major subsystems. Built-in software provides a "field test" mode to allow complete receiver operation from a simple terminal without need of customer's complete control system.

A Windows based graphical user interface (GUI) is under development and will be available as an option.

TECHNICAL SPECIFICATIONS

FREQUENCY COVERAGE: 10kHz – 30 MHz, degraded performance below .2 MHz but tunable down to 0 MHz.

MODE: USB, LSB, ISB, CW, AM, Synchronous AM, FM; all standard.

TUNING RESOLUTION: 1 Hz steps.

FREQUENCY STABILITY: +/-1 PPM per degree C within operating range 0 – 50 degrees C using internal reference. Optional TCVCXO provides +/- 1 PPM over entire operating range.

EXTERNAL FREQUENCY REFERENCE: 1, 2, 5, or 10 MHz ( +/- 1 PPM, 200 mv p-p into high impedance load). Receiver automatically switches to this reference upon application.

SYNTHESIZER LOCK TIME: 10 msec typical

ANTENNA INPUT: 50 ohm, unbalanced, BNC connector.

ANTENNA IMPEDANCE: 2:1 SWR max @ receiver's tuned frequency

SELECTIVITY: Approximately 57 bandwidths selectable from .1 kHz -16.0 kHz. Shape factor 1.5:1 or better. (6 to 60 dB)

GROUP DELAY: no more than .1 ms variation over passband of 300 Hz to 3050 Hz.

ULTIMATE REJECTION: 70dB minimum regardless of filter selected.

SENSITIVITY: (PREAMP OFF)                                                                                              

SENSITIVITY: LOW FREQUENCY RANGE (PREAMP OFF)

Table above is tentative based on engineering changes in progress.

DYNAMIC RANGE:  

BFO: Tunable in CW rnode only, +/- 8 kHz. Tuning in 10 Hz steps with a tuning accuracy of +/- 10 Hz steps with a tuning accuracy of +/- 10 Hz of desired frequency setting. Fixed frequency in SSB/ISB (455 kHz), disabled in AM and FM.

WIDEBAND OUTPUT: 45.455 MHz center frequency, output level 10 dB below receiver input. Bandwidth equivalent to preselector, no AGC.

IF OUTPUT, POST DSP: 455 kHz center frequency, -10 dBm nominal (+/- 3 dBm) @ 50 ohms through BNC connector (AGC active ). Bandwidth determined by filter selection.

SIGNAL MONITOR OUTPUT, DELAYED AGC: 455 kHz, 16 kHz bandwidth (-6 dB point), - 10 dBm nominal (+/-3 dBm) @ 50 ohms through BNC connector. AGC delayed 40 dB.

SIGNAL MONITOR OUTPUT, NO AGC: 455 kHz, 16 kHz bandwidth, output level 10 dB below receiver input @ 50 ohms through BNC connector.

AGC: Fast, Medium, Slow, Off. Manual control is provided through RS-232 Interface.

Range - 90 dB minimum
Threshold - 3.0 uV typical
Attack Time - 15 ms typical
Release Time – Fast 25 ms
                       Medium: .5 second
                       Slow: 4 seconds maximurn

SPURIOUS RESPONSES: A maximum of 10 responses greater than 10 dB S/N with 3.2 KHz detection bandwidth, .5-30 MHz, preamp ON.

IMAGE REJECTION: 75 dB typical, 70 dB minimum

IF REJECTION: 80 dB minimum

AUDIO LINE OUTPUT: 0 dBm (+/-3dBm) Two 600 ohm outputs (one for each sideband in ISB mode ) to DA-15 connector, ungrounded center tap. In all other modes, signal is mono. Terminals may be grounded or shorted together without damage.

ISB HEADPHONE OUTPUT: Front panel mounted 1/4" stereo phone jack. Other modes mono. 10 mw maximum into 600 ohms. Front panel volume control.

MONO HEADPHONE OUTPUT: Front panel mounted 1/4" phone jack. LSB, USB or both available, switchable by software control only. Front panel volume control. Fixed level mono output also available at rear panel screw terminals.

DIGITAL DATA OUTPUT: Provides post DSP IF and audio information in both serial and parallel data streams.

CONTROL INTERFACE: All receiver functions are controllable except headphone volumes. Multi-drop RS232 network @ DB25. Baud rate programmable from 300 to 19200. 7 or 8 data bits - even, odd or no parity. Interface can be configured for multiple or single receiver applications.

MEMORIES: 100 rnemory store and recall.

OPERATING TEMPERATURE RANGE: 0- 50 degrees C @ full specification. -10 to 60 degrees C with degraded performance.

MTBF: Not specified

POWER REQUIREMENTS: switch selectable 115/230 VAC +/-15%, 48-440 Hz @ 30 watts nominal, Removable six foot line cord.
Front Panel ON/OFF switch provided.

DIMENSIONS: 1 3/4"H x 19"W (1U) (44.45 X 482.6mrn). Chassis depth 20" ( excluding front panel knobs, handles and rear panel connectors ). Sized to mount in standard 19" racks. Accepts Jonathan slide type 375QD.

WEIGHT; 12 lbs. ( 5.43 kg )

ADDITIONAL FEATURES:

Squelch: FM mode only
Passband Tuning: +/- 2 KHz in USB, LSB and CW
Mute: for use in transmit/receive applications, mutes audio and post DSP IF output.

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