MIL-PRF-1/21D
NOTES: - Continued.
4/
When the tube is fired by the application of high power in cavity according to Drawing 162-JAN which
is at resonance, the transmitted power obtained shall be less than that of a standard tube fill with
pure hydrogen to a pressure of 25 mmHg. The power level at the input shall be sufficient to fire the
rf gap of the tube and to insure that the measurement is being made on the flat part of the "power in
the gap versus leakage power" characteristic. If the main discharge gap does not fire, it is caused
to be fired by a short application of ignitor voltage.
5/
With the tube operating as outlined in note 4, a small portion of the tube envelope shall be cooled by the
application of solid CO2. The ratio of the minimum reading of the output meter (Po2) to that obtained before
the application of solid CO2 (Po2) shall be less than the given value, and the final reading shall be less than
the initial one.
6/
The specified life is based on ignitor life only. This will be reduced if the tube is operated at full rated
rf conditions.
7/
The tube shall be mounted in the specified external cavity and placed between a matched generator and detector.
The signal generator frequency shall be varied to obtain the resonant frequency of the tube and cavity as evidenced
by a pronounced peak at the output indicator. The value of this resonant frequency shall be within the limits specified.
Referenced documents. In addition to MIL-PRF-1, this specification sheet references the following:
MIL-STD-1311 and Drawing 162-JAN.
Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect to the
previous issue due to the extent of the changes.
3
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