MIL-PRF-1/1654B(NAVY)
TABLE I. Testing and inspection - Continued.
7/
At each of the frequencies specified, with Pi(rf) adjusted to obtain saturated power output, Pso, the values of Pi(rf) and Pso shall be
within the limits specified. Vary Pi(rf) above and below the saturation value to obtain the Pso-3 dB points. The values of Pi(rf) at
these points shall be within the specified limits and shall differ by at least 9 dB.
8/
Adjust Pi(rf) to obtain saturated power output. Using this value of Pi(rf), measure Po continuously across the band 5.4 to 5.9 GHz.
The total variation in power output, Po, across the band shall be not greater than the limit specified.
9/
Cc-all is the capacitance between grid and all other elements, including the shell. The grid lead shall be at maximum separation
from the shell and all others leads.
10/ The temperature test shall be conducted in accordance with the requirements of MIL-E-16400(NAVY), for class 4 equipment. The
tube shall operate within the limits specified under conformance inspection, part 1, large-signal power output.
11/ With the tube in the environment chamber, reduce the chamber temperature to 0 C 2 C, and maintain the chamber temperature
for at least 24 hours with the tube in the non-operating condition. At the end of the 24-hour period, turn on the tube. The tube shall
operate within the limits specified under conformance inspection, part 1, large-signal power output, within 25 minutes of application
of heater voltage.
12/ The humidity test shall be conducted in accordance with the requirements of MIL-E-16400(NAVY), for class 4 equipment.
Reference measurements and all subsequent measurements shall consist of the test for large-signal power output under
conformance inspection, part 1.
13/ The non-operating temperature test shall be conducted in accordance with the requirements of MIL-E-16400(NAVY). Upon
completion of the test, the tube shall operate within the limits specified under conformance inspection, part 1, large signal power
output.
14/ The conformance tests, part 2, shall be performed in accordance with MIL-STD-105, inspection level 2, with an acceptance level of
4 percent. In the event of lot rejection, tightened inspection shall be invoked. Normal inspection shall be resumed when two
consecutive lots have conformed with the tests of conformance inspection, part 2. For purposes of inspection, the lot size shall be
one month's production.
15/ Tubes shall be selected at random from the production lot, and shall previously have passed the test of conformance inspection,
part 1.
16/ For spurious power output (1), the output termination shall have a nominal value of 50 ohms, and the input shall be terminated in a
variable-phase short circuit. For spurious power output (2), the terminations shall be transposed. A preselector having a passband
of not more than 30 MHz, and a tuning range of 4.9 to 6.4 GHz shall be used between the tube and the power-measuring device.
The spurious power output, spo, shall be not greater than the specified value in any portion of the above frequency range at all
phases of the short circuit.
17/ At each of the specified frequencies, adjust the r-f input power Pi(rf) to obtain saturation. Reduce the heater voltage to the lower of
the specified values and read the power output, Po. Increase the heater voltage to the higher of the specified values and read the
power output. Allow the power to stabilize at each reading. The total change in output shall be within the specified limit.
18/ At each of the specified frequencies adjust Pi(rf) to obtain saturation. Reduce Pi(rf) by 4 dB. Vary Ew from Ew - 1 percent to Ew +1
percent and note the power output, Po, at each value. Increase Pi(rf) to the saturation value plus 4 dB and repeat the power
measurements. The change in power, Po, from the reference value, Po, at Ew, in each case shall be within the limit specified.
19/ Tubes for these tests shall be selected at random from the production lot, and shall previously have passed the tests of
conformation inspection, part 1.
20/ The tube shall meet the power output conditions at all frequencies within the band when operating into a load of l.5:1 VSWR,
minimum.
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