Watkins-Johnson Company Technical Information and History

The Watkins-Johnson Company has a rich history that dates back to 1946, when it was founded by William E. Watkins and Donald A. Johnson.

The company started as a small electronics firm in Palo Alto, California, and quickly gained recognition for its innovative products.

In the early years, Watkins-Johnson focused on producing high-quality audio equipment, including amplifiers and speakers.

The Watkins-Johnson Company's WJ-8711A receiver has a robust feature set, including remote signal strength indicator output, squelch output, and mute input. These outputs can be accessed via TB1 terminals 10, 11, and 12, respectively.

The receiver requires a power input of 90-264 VAC, which can be connected to the FL1J1 terminal. This is a critical component, as the receiver will not function without it.

The WJ-8711A has a user-friendly interface, with a front panel headphones jack (A1J1) that allows users to listen to audio outputs. This is a convenient feature for users who need to monitor the receiver's output in real-time.

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The receiver has a built-in test function (BITE) that can be accessed by running the BITE function, as described in section 89. This feature is useful for troubleshooting and diagnosing issues with the receiver.

The WJ-8711A can be configured for remote operations using the front panel, as described in section 42. This allows users to control the receiver from a remote location, making it a valuable feature for applications where the receiver needs to be controlled remotely.

The receiver has a range of detection modes, including CW detection, which can be selected using the detection mode selector, as described in section 77. This feature is useful for applications where CW detection is required.

The WJ-8711A has a scan mode that allows users to scan a range of frequencies, as described in section 84. This feature is useful for applications where users need to monitor a range of frequencies simultaneously.

The receiver's sensitivity performance is tested using the WJ-8711A Sensitivity Performance Test, as described in section 166. This test is used to determine the receiver's sensitivity and is an important factor in determining the receiver's overall performance.

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The WJ-8711A has a range of performance tests, including audio distortion performance, squelch/mute performance, and reconstructed if output performance. These tests are used to determine the receiver's performance in different operating conditions and are an important factor in determining the receiver's overall quality.

The receiver's RF/IF signal path performance is tested using the RF/IF Signal Path Performance Test, as described in section 174. This test is used to determine the receiver's performance in terms of its ability to receive and process RF and IF signals.

The WJ-8711A has a range of corrective maintenance procedures, including replacing the receiver top cover, as described in section 177. This is an important procedure for maintaining the receiver's performance and ensuring that it continues to function correctly.

The receiver's power supply assembly (PS1) can be removed and replaced using the procedures described in sections 184 and 185. This is an important procedure for maintaining the receiver's performance and ensuring that it continues to function correctly.

The WJ-8711A has a range of replacement parts, including the digital control PC assembly (A2), the RF tuner assembly (A3), and the power supply assembly (PS1). These parts can be replaced using the procedures described in sections 180-185.

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Here is a list of the receiver's main components and their corresponding removal and replacement procedures: