GENERAL RADIO COMPANY 1263-8 Operating Instructions Manual page 6

Section 1
INTRODUCTION
1.1 PURPOSE.
The Type 1263-B Amplitude-Regulating Power Supply (Figure 1) is
designed to operate General Radio Unit Oscillators or oscillators with
similar power requirements. This power supply automatically adjusts
the plate current supplied to an oscillator to maintain the rf output volt-
age at a constant preset level. This constant output is of great advant-
age in frequency-response measurements,
:;~nd
is particularly important
when the oscillator frequency dial is mechanically swept for use with an
oscilloscope or recorder. The oscillator must have suitable connections
for application of a modulating voltage (as have Genera l Radio Unit Os-
cillators). There must also be available an output rectifier to supply a
negative de potential proportional to the oscillator rf output. In Figure
2, a Type 1263-B Amplitude-Regulating Power Supply
is
shown with a
Type 1750-A Sweep Drive, driving a Type 1209-B Unit Oscillator. The
Type 1263-B Amplitude-Regulating Power Supply was designed especially
for use with oscillators driven by the Type 1750-A. It is equally useful
with the Types 907-R and 908-R Dial Drive s (see paragraph 1.3.6) and
with manually operated oscillators.
For most swept-frequency applications, cw operation is desirable
because fast regulating action is possible. However, in this instrument,
Figure 2. Type 126 3-B
Amplitude-Regulating
Power Supply and
Type 1750-A Sweep
f>rive shown driving
a
Type 1209-H Unit
Oscillator.