Racal RA6793A-6 (R-2320/URR) Receiver

This is a truly rare professional communications receiver designed and built by Racal Communications. The RA 6793A-6 receiver covers 500Hz - 30MHz and features scanning of up to 100 pre-programmed memory channels, 3 speed tuning rate with 1Hz tuning resolution. It features a "real" (not membrane) keypad for data entry, scan, carrier operated relay, variable AGC, plus many other features including extensive built-in self test, and a large clear liquid crystal alpha-numeric display.

CLICK HERE FOR PHOTOGRAPHS

RACAL RA6793A-6
DESIGN FEATURES

This particular variant of the RA 6793A the (-6) is designed as a super high reliablity hf SSB/ISB mil-spec receiver with conformal coated boards inside to inhibit corrosion. The antenna input connector and external frequency standard inputs are TNC type. This radio has the ISB option installed. Battery looks great, displays are sharp and crisp and everything is working perfectly. I've included some internal photos to give you an idea of how it really looks inside. It's very very nice to say the least.

Enjoy!!

  • Features the Z80 microprocessor board
  • Frequency selection from the keypad, rotary tuning control, or 100 preset memory channels.
  • Built-in test (BIT) for fault isolation to card/ module or functional circuit level.
  • Five selectable bandwidths plus U/LSB.
  • Remote control interface (RS-232).
  • Voice squelch with front panel adjustable threshold.
  • TCXO frequency standard.

    Racal RA6793A-6 Specifications

    Modes of Operation: CW, AM, FM, FSK, ISB, LSB, USB, SSB, DSB, MCW, PCM

    Filters, Rockwell Collins Mechanical Filters: 6.0 kHz BW, 3.20 kHz BW, 1.0 kHz BW, 0.30 kHz BW, LSB - 2.95 kHz BW, USB - 2.95 kHz BW.

    Frequency Range: 0.5 kHz to 29.999 99 MHz in 1 Hz increments.

    Frequency Stability: +/- 5 parts in the 108 per 10oC temperature increment over 0oC to 50oC using internal 5 MHz reference oscillator. Provision for an external 1, 5 or 10 MHz reference I/O.  0 dBm nominal into 50 ohms.

    Detection Modes: CW/A1 continuous wave; CW/A2 modulated continuous wave; USB/LSB, A3A, A3H, A3J, A2A, A2H, A2J; AM/A3 amplitude modulation; A4 (facsimile) ISB/A3B independant sideband (optional); FM/F3 Telephony.

    Gain Control Mode: AGC, An increase of 110 dB above AGC threshold will result in a change of output less than 3dB. Threshold Range (preset): -113 dBm to -100 dBm.

    Manual/Automatic Gain Control: There is also a provision on the front panel to select, and by the use of the RF Gain Control, to manually control the AGC threshold anywhere within the range of 110 dB above the preset AGC threshold level.

    Input Impedance: 50 ohms nominal, 2:1 VSWR type TNC connector

    Synthesizer BFO: +/1 8 kHz in 10 Hz steps

    Noise Figure: < 15 dB

    Sensitivity (500 kHs to 30 MHz): SSB, -113 dBm (0.5 uV) for 10 dB (S+N)/N ratio; AM, -99 dBm (2.5 uV) for 10 dB (S+N)/N ratio in a 6 kHz bandwidth.

    Sensitivity: USB -3 dB 450 Hz to 3000 Hz or -60 dB -600 Hz to 4300 Hz; LSB, -3 dB -450 Hz to -3000 Hz or -60 dB 600 Hz to -4300 Hz.

    Filters, Rockwell Collins Mechanical Filters: 526-9957-040, SYM, 455.0 kHz CF, 6.0 kHz BW, 9 dB Inertion Loss; 526-9957-030, SYM, 455.0 kHz CF, 3.20 kHz BW, 9 dB Inertion Loss; 526-9957-020, SYM, 455.0 kHz CF, 1.0 kHz BW, 9 dB Inertion Loss; 526-9957-010, SYM, 455.0 kHz CF, 0.30 kHz BW, 11 dB Inertion Loss; 526-9958-010, LSB, 455.0 kHz CF, 2.95 kHz BW, 8 dB Inertion Loss; 526-9959-010, USB, 455.0 kHz CF, 2.95 kHz BW, 8 dB Inertion Loss;

    Reciprocal Mixing: The apparent noise appearing at the receiver input when in a 3 kHz bandwidth, caused by a 0 dBm signal 100 kHz off tune is less than -100 dBm.

    Image & Spurious Rejection: Greater than 80 dB, for signals is least(sic) +/- 50 kHz from tuned frequency.

    Internal Spurious Responses: <-123 dBm

    Outputs: IF, 455 kHz, 50 ohms, level -10 dBm nominal; AF,100 Hz to 16 kHz for 3 dB flatness response, 1 W nominal into 8 ohm load, distorion <3% at 500 mW; AF Lines, 600 ohms, <2% distortion; AGC, Fault, Phone, 30 mW max into 600 ohm load with distortion <3% at 10 mW; Reference Out, selectable TCXO reference frequency of either 1, 5, or 10 MHz.

    Rear Connectors: A6A1 25-pin, A1J1 TNC, J7 TNC, J8 BNC, J3 DB25, J2 BNC.

    Power Requirements: 115/230 Vac +/- 10%, 48 to 420 Hz, single-phase AC.

    Power Consumption: Less than 40 VA (nominal).

    Environmental Temperature: Operating, 0 to +50oC (+32 to +122 degrees F). 

    Humidity: 10% to 85% relative humidity, no condensation.

    Altitude: Operating to 15,000 ft.

    Dimensions: 5.25" H x 19" W x 18.5" D

    Weight: 32 lbs (14.5 kg) approx.

    Toronto Surplus & Scientific Inc. v2