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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
- Upload relevant documents
New and second-hand prices
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These estimates are based on the following prices:
Links & tools
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- Search Wikipedia for Watkins-Johnson WJ-521A-1 information
- Search the Boat Anchor Manual Archive (BAMA) for Watkins-Johnson WJ-521A-1 for manuals and documents (using Google)
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