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SPECIFICATIONS
Rf Output Voltage:
0.2 to 2.0 volts behind
50 ohms for any recommended oscillator (see
below), and a Type 874-VR Voltmeter Recti-
fier. With 1-kc square-wave modulation, 0.2
to 1.0 volt behind 50 ohms.
Rf Output Regulation:
Below 500 Me, rf out-
put of recommended Unit Oscillators is held
to within ±5% including the effects of har-
monics. This regulation can be attained up
to 2000 Me if proper low-pass rf filters are
used and a correction applied for the output-
rectifier frequency characteristic.
Modulation
Frequency: 1-kc
square-wave, adjustable
±5%, stable to within 5 cps over the rated
range of line voltage.
Duty Ratio: 0.5 to 0.53, adjustable to com-
pensate for oscillator starting delay.
Rise and Decay Times: 50 f.Lsec each.
Overshoot: None.
Ramp-off: Less than 0.5%.
Gate Voltage: Synchronized with "off" in-
terval of modulation, exceeds 1 volt into the
the recommended load of 30 k.O shunted by
300 pf. Rise and decay times are less than
50 f.Lsec each. Gate output during "on" in-
terval of modulation is less than .01 volt.
Plate Supply Output:
0 to 300 volts at 30 ma.
Heater-Supply Output:
6 v ±10% at 0.5 amp,
5.4v ±10% at 0.7 amp.
Response Time:
For a 2-to-1 step variation
in oscillator output, correction is completed
within 0.5 msec with cw operation, 50 msec
with 1-kc modulation. Recovery time after
blanking is less than 2 msec with cw opera-
tion less than 200 msec with 1-kc square-
wave modulation.
Hum and Noise:
Peak residual hum and noise
modulation is less than ±0.3% on cw; less
than ±3% with 1-kc square-wave modulation.
Output Voltmeter:
Internal standardizing cir-
cuit is provided. Accuracy after standard-
ization is better than ± 10% of indication
when a correction is applied for rectifier
characteristic at extremely high frequencies.
Tube Complement:
Four 12AX7, one each
5963, 6V6GT, OA2.
Power Input:
105 to 125 (or 210 to 250). volts,
50 to 60 cps, 55 watts maximum, at full load.
Accessories Supplied:
Type CAP-22 Three-
Wire Power Cord, connector cable for modu-
lation jack on oscillator, spare fuses.
Other Accessories Required:
Type 874-VR
Voltmeter
Rectifier,
Type 874-R22 Patch
Cord for connecting output rectifier, and Type
874-T for monitoring oscilloscope connection
in sweeping applications.
Recommended Oscillators:
Type 1215·B (50
to 250 Me), Type 1209-BL (180 to 600 Me),
Type 1209-B (250 to 920 Me), Type 1361-A
(450 to 1050 Me), Type 1218-A (900 to 2000
Me), and for cw operation only Type 1211-B
(0.5 to 50 Me).
Other
Accessories
Available:
The
Type
1750-A Sweep Drive is recommended for auto-
matic operation. Coaxial Cables, connectors,
attenuato;s, filters, adaptors, and relay-rack
adaptor panels are available.
Mounting:
Aluminum panel and cabinet.
Dimensions:
Width 8, height 7, depth 9XI
inches (205 by 180 by 235 mm), over-all.
Net Weight:
14~
pounds (6.6 kg).
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