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GENERAL RADIO COMPANY
2.3 RESPONSE TIME.
In swept-frequency applications, rapid variation of oscillator out-
put is likely to occur, particularly in the uhf range. This variation can
be nearly eliminated by the Type 1263-B Amplitude-Regulating Power
Supply.
Cw operation is recommended for most sweeping applications
since the most rapid regulator response is obtained in this mode.
With
cw operation the Type 1263-B will correct a 2-to-1 step of oscillator out·
put voltage in less than 0.5 millisecond.
If
blanking is applied by shorting
contacts in the sweep-drive mechanism, regulation is restored within 2
milliseconds after blanking is removed. With internal 1-kc square-wave
modulation the response and recovery times of the power supply are in-
creased to about 50 and 200 milliseconds, respectively.
With cw operation the recommended General Radio Unit Oscillators
can be swept through their entire ranges in less than one-half second
with satisfactory regulation. To ensure complete regulation with modu-
lation, the entire ranges of the oscillators should not be swept in less
than 10 seconds, although good regulation can be obtained over most of
the ranges with a sweep time as low as two seconds.
Section
3
INSTALLATION
3.1 CONNECTIONS.
(Refer also to Section 1.3.)
3.1.1 POWER AND MODULATION CONNECTIONS.
Plug the Unit Os-
cillator power cable into the multipoint connector on the right-hand side
of the power supply. With the patch cord supplied, connect the MODU-
LATION plug on the power supply to the modulation jack of the Unit Os-
cillator.
CAUTION
Excessive voltage, even if applied for a short time,
can damage crystal diodes.
Do not apply ac power to
the power supply until all connectio.ts between oscil-
lator, output rectifier, and power supply have been
made.
When using the Type 1211- B Vnit Oscillator.
tum the selector switch on the power supply to ZERO
while changing frequency range.
8
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