MIL-PRF-1/1631B
TABLE I. Testing and inspection - Continued.
4/
The temperature coefficient, when tested under the conditions specified, shall be computed in kilohertz per degree celsius over the
temperature range specified.
5/
The tube under test (TUT) shall be adjusted to its center (resonance) frequency. Tune the signal source -150 MHz from the tube's
center frequency and locate the position of the null on a standing wave indicator. Repeat the procedure with the signal source tuned
to +150 MHz from the tube's center frequency. Replace the TUT with a shorting plate, tune the signal source to the tube's center
frequency, and locate the position of the null on the standing-wave indicator. The effective resonator position is then defined as the
position of the VSWR null with the shorting plate attached to the waveguide minus the average location of the VSWR null at 150
MHz from the tube's center frequency with the tube attached to the waveguide. The VS-1120 adapter, or equal, may be used to
change the effective resonator position of the tube 0.710 0.005 inches.
6/
The beam current shall not drop more than the specified percentage when the heater voltage is decreased from the normal operating
potential to the lower specified value.
7/
The test shall be made after a minimum warm-up of 2 minutes. The tube shall not be oscillating during the test.
8/
There shall be no power discontinuities between the half-power points for either direction of reflector voltage change through the
tuning range specified under tunable frequency.
9/
The tube shall be capable of being tuned smoothly and without discontinuities over a frequency range including the limits specified.
10/ If the periodic-check tests have previously been performed by the tube manufacturer, and if materials, manufacturing processes,
and test requirements are the same as when the tests were previously performed, the periodic-check test(s) need not be performed.
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