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Collins 451S-1

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Desktop Shortwave receiver

General coverage version of the Collins KWM-380. Solid state design featuring single-knob tuning over the entire frequency range without band-switching. Microprocessor controlled.

Specifications
Type
Desktop Amateur HF Receiver 
Frequency range RX
0.2-30 MHz 
TX
Frequency stability
Within 1100 Hz (or 120 Hz using optional oven standard) over the temperature range of 0-50 °C. 
Tuning steps
Selectable steps of 10 Hz, 100 Hz, 1 kHz or 1 MHz; 200 steps per revolution (20 for 1 MHz steps) of tuning knob. 
Filters
Receiver
Modulations
AM / CW / USB / LSB / FSK 
Sensitivity
(at 1.6 to 30 MHz, not more than antenna input) 0.5 µV for 10 dB S+N/N for SSB and CW using 2.1 kHz filter and 3.5 µV in AM (30% mod 1 kHz) using 6-kHz filter 0.2 to 1.6 MHz, not more than 1.5 µV SSB/CW and 10 µV AM for above conditions. 
Selectivity
Filter -3dB Min -60 dB Max
6.0 6.0 kHz 30.0 kHz
2.1 2.1 kHz 4.4 kHz
360 360 Hz 1250.0 Hz

optional
AC-3811 140 Hz 600 Hz
AC-3812 1.7 kHz 3.4 kHz
AC-3814 3.0 kHz 9.0 kHz 
Receiver system
Double conversion superheterodyne (?) 
IF-frequencies
1st: ?
2nd: 455 kHz 
Image rejection
≥ 60 dB 
Audio output
Internal speaker 
Transmitter
Modulations
RF-output
Connections
Antenna
BNC 
Impedance
50Ω 
Electrical
Power requirements
Mains or 13.8 V DC 
Current drain RX
TX
Physical
Dimensions (w×h×d)
394 × 191 × 457 mm (15.51 × 7.52 × 17.99 in) with feet 
Weight
12.7 kg (28 lbs)  
Form factor
Desktop 
Manufactured
Between 19xx and 19xx in USA 
Other features
Memories
Usage
Amateur / Ham radio operators 
Manufacturer
Collins 
Model
451S-1
Features
Passband tuning
Built-in AC/DC power supply
Built-in speaker
Digital frequency readout 
Manuals, Diagrams and Brochures
 
None available  
 
 
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