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Collins 51J-4

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Desktop Shortwave receiver

The Collins 51J-4 receiver is designed for communication applications where stability and dial accuracy of the highest order are the prime requisites. Under normal operating conditions, the receiver operates in the range of 540 kc to 30.5 mc with a total setting error and drift of less than 1 kc at any frequency within its range. The receiver is designed for amplitude- modulated (AM) and continuous wave (CW) reception, although its accuracy and stability make it suitable for many applications where it is desired to receive or set definite frequencies without searching or making frequent adjustments.

Specifications
Type
Desktop Amateur HF Receiver 
Frequency range RX
0.54-30.5 MHz 
TX
Frequency stability
Dial calibration at room temperature is within 300 cps if the nearest 100 kc calibration point is used to adjust the fiducial. 
Tuning steps
Filters
Receiver
Modulations
AM / CW 
Sensitivity
Band 1: < 15 µV gives 10 dB S/N
Bands 2 to 30: < 5 µV gives 10 dB S/N 
Selectivity
1 / 3 / 6 / 10 kHz 
Receiver system
IF-frequencies
Image rejection
Audio output
Transmitter
Modulations
RF-output
Connections
Antenna
SO-239 + Klemmen / schroeven 
Impedance
50Ω 
Electrical
Power requirements
Mains (115 or 230 V AC, 45~70 Hz) 
Current drain RX
85 W 
TX
Physical
Dimensions (w×h×d)
536 × 317 × 333 mm (21.10 × 12.48 × 13.11 in)  
Weight
24.9 kg (54.9 lbs)  
Form factor
Desktop 
Manufactured
Between 1957 and 1963 in USA 
Other features
Memories
Usage
Amateur / Ham radio operators 
Manufacturer
Collins 
Model
51J-4
Features
 
Manuals, Diagrams and Brochures
 
None available  
 
 
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