[Premium-Rx] RACAL RA6793-6 HF receiver

[Tim Kass]

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.

This particular variant of the RA 6793A the (-6) is designed as a super high
reliability 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.

Features the Z80
     microprocessor boardFrequency 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. . 

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 independent 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. 

Input Impedance: 50 ohms nominal, 2:1 VSWR type N 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 Insertion Loss; 526-9957-030,
SYM, 455.0 kHz CF, 3.20 kHz BW, 9 dB Insertion Loss; 526-9957-020, SYM, 455.0 kHz CF, 1.0
kHz BW, 9 dB Insertion Loss; 526-9957-010,
SYM, 455.0 kHz CF, 0.30 kHz BW, 11 dB Insertion Loss; 526-9958-010, LSB, 455.0 kHz CF, 2.95
kHz BW, 8 dB Insertion Loss; 526-9959-010,
USB, 455.0 kHz CF, 2.95 kHz BW, 8 dB Insertion 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, distortion
<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 . 

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

Power Consumption: Less
than 40 VA (nominal). 

Dimensions: 5.25"
H x 19" W x 18.5" D Weight: 32 lbs (14.5 kg) approx.


Receiver comes with manual and
power cord

Sold AS-IS but is in good working order.  
Shipping to CONUS ONLY, this will be PROFESSIONALLY packed and shipped
through a packing/shipping agent as well as fully insured.  Shipping rates will run from $35 - $75
depending on location.  Shipped from Ohio,
45211.