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.

General Radio 1025-A

sweep oscillator General Radio 1025-A Sweep Frequency Generator Available from 1963 to 1968 Manuals General Radio 1025-A Sweep Frequency Generator Manual 1025-0110-B 1965 (All manuals in PDF format unless noted otherwise)

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

Sweep Motor Upper Power Supply Lower
Sweep Drive Motor and Clutch Assembly
200 V regulator (A5)
Power Supply
Top Side of (A4) board
Top Side of (A3) board
Attenuator
-150 V regulator and meter circuit (A3)
Automatic amplitude-control amplifier (A4)
Power Supply Board (A8)
Band Switch Turret and Variable Capacitor Shield Removed
Band Switch Turret
Motorized Tuning Capacitor
Oscillator Close-up 5675 Triode Vacuum Tube