1025-A

The General Radio 1025-A Sweep Frequency Generator was introduced in 1963 Catalog R and remained available through Catalog T 1968. The type 1025-A is motor driven type sweep oscillator. The frequency determining variable capacitors rotor is motor driven. Also mounted on the rotor is a trigger used to create a marker for the swept frequency. The oscillator covers 0.7 to 230 MHz plus two band spread segments. The segments on this particular unit are 400 to 500 kHz for broadcast radio IF frequency and 10.7 MHz ±300 kHz for FM and TV broadcast IF frequencies. Other custom band spread segments were available. There's also a control to manually turn the rotor to set up the sweep characteristics.

Specifications

• Frequency Range: 0.7 to 230 MHz in 10 ranges plus band spread ranges.
• Calibration Accuracy: At output voltages less than 0.3 volt, frequency is indicated to within +0.5%.
• Drift: Not greater than 0.3% for five hours after one-hour warmup.
• Sweeping Rate: 22.2 milliseconds 20 times per second.

Links

• Experimenter describing Type 1025-A January 1963

Photos

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  Sweep Motor Upper Power Supply Lower

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  Sweep Drive Motor and Clutch Assembly

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  200 V regulator (A5)

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  Power Supply

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  Top Side of (A4) board

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  Top Side of (A3) board

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  Attenuator

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  -150 V regulator and meter circuit (A3)

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  Automatic amplitude-control amplifier (A4)

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  Power Supply Board (A8)

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  Oscillator Close-up 5675 Triode Vacuum Tube