Collins 51J-4

Desktop Shortwave receiver

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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.

Frequency range

RX-range
0.54-30.5 MHz
TX-range
-
HAM bands
?
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 + Clamps / screws
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
24.90 kg (54.9 lbs)
Form factor
Base Station
Manufactured
Between 1957 and 1963 in USA
MPN
COLLINS-000051J-4

Other features

Memories
?
Usage
Amateur / Ham radio operators
Features + options
?
Accessories
?

Manuals, diagrams and brochures

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