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The left part of the front panel has a panoramic display offering an visual survey on all R.F. emissions in a certain frequency segment. You can select the SWEEP WIDTH, the width of the band segment displayed up to 300 kHz, adjust the SM GAIN, the level of the signals displayed and move the most interesting signal in the middle of the display using the CENTER FREQ control.

The controls of the receiver itself are located on the right half of the front panel: At the right, just above the headphones jack, you find the AUDIO GAIN volume control combined with the mains switch, at it's left the main tuning knob. The receiver is equipped with a mechanical film dial with coarse frequency markings, you can also read the reception frequency from the nixie tubes frequency display, the option DRO-290-A1 is installed in all Swiss receivers. Of the two analog meters, one is used as signal strength meter and the second one as center indicator when the set is set to FM operation.

General characteristics

HAM bands
15m  12m (WARC)  11m (CB)  6m  10m  4m 
Frequency stability
?
Tuning steps
Continuous
Memories
None

Receiver

RX-range
20-80 MHz
Modulations
AM   FM   N-FM   CW  
Sensitivity
AM ca. 0,5 μV
FM ca. 1,2 μV
Selectivity
4 / 10 / 50 kHz @ -6 dB
Filters
?
Receiver system
Double conversion superheterodyne
IF-frequencies
10 MHz / 455 kHz
Image rejection
?
Audio output
Requires headphones or external speaker

Connections

Antenna
-
Impedance
50Ω
Other
-

Electrical

Power requirements
Mains (220 V AC)
Current drain RX
16 W
TX
-

Physical

Dimensions (w×h×d)
483 × 90 × 478 mm (19.02 × 3.54 × 18.82 in)
Weight
8.20 kg (18.1 lbs)
Form factor
Base Station
Manufactured
Between 1980 and 198x in USA

Other features

Usage
Military communication
Features + options
-
Accessories
DRO-290 Digital Nixie-tube display
RigReference ID
5332
MPN
WATKINS-JOHNSON-WJ-000521A-1

Manuals, diagrams and brochures

E-649 Watkins Johnson 521a3 Service Manual De Fr PDF - 11.66 MB, submitted by RigReference
 
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