MIL-PRF-1/849G
TABLE I. Testing and inspection - Continued.
1/ Unless otherwise specified, the acceptance level for all tests listed under conformance inspection, part 1, shall be 1.0, inspection
level II.
2/ 10 to 55 to 10 Hz. Vibrate from 1 to 3 minutes at 10 G or 0.60-inch (1.53 mm) double amplitude; repeat for a total of 90 minutes in
each of the three mutually perpendicular axes. Vibrate for 30 minutes at each of the resonant frequencies noted.
3/ VSWR cycled through Og in about 30 minutes; starting at 8,500 MHz, the frequency shall be increased in 100 MHz increments every
10 hours.
4/ In handling and mounting the magnetron, care shall be exercised to prevent demagnetization.
5. Immediately after a nonoperating period of 168 hours minimum, the starting stability test shall be performed on 100 percent of the
submitted lot.
6/ After subjection to the specified test, the tube shall meet the requirements for RF bandwidth, minor lobe ratio, and stability as
specified under test condition 1.
7. Separate samples shall be required for this test.
8/ The tubes shall be fastened rigidly to the vibration platform and vibrated with simple harmonic motion. The direction of vibration
shall be as indicated on figure 1.
9/ The tuning mechanism shall withstand the specified torque at the limits of mechanical motion.
10/ The torque required to operate the tuning shaft through the specified tuning range shall not exceed the maximum specified.
11/ The tuner shall operate for at least the specified number of cycles. The tube shall then meet all of the conditions of test condition 2
and the torque and backlash at room temperature shall not exceed the specified amount. One cycle is defined as a complete
traverse from one end of the tuning range to the other and back again. During this test the tuner may be lubricated not more than
once every 1,000 cycles with Texaco low-temperature grease No. 1,888, or equivalent.
12/ After the specified number of cycles, the tube shall pass all the tests under test condition 2 in conformance inspection, part 1.
13/ The frequency obtained by turning the tuner to a given setting in one direction shall be reproducible within specified limits when
returning to that same setting from the opposite direction after thermal equilibrium.
14/ After thermal frequency stability has been reached at each of the frequencies of this test, F1, F2, F3, F4, F5 (see 24/), the curve of
frequency versus tuner position shall not deviate more than the specified amount from the curve on figure 2.
15/ This test shall be performed by a continuous observation while the tube frequency and a stub having a VSWR of 1.5:1 minimum are
continuously varying. The stub shall travel a minimum of 180 electrical degrees for every 20 MHz of magnetron tuning.
16/ The measurement shall be made throughout the specified tuning range at a rate sufficiently slow to permit steady-state indications.
At no place in the specified tuning range shall the specified limits be exceeded.
17/ With the tuning dial adjusted for a frequency of 9,000 MHz, an operating frequency of 9,600 MHz shall be obtained by clockwise
rotation of the designated end of the tuning shaft 68 r 12 turns. A frequency of 8,500 MHz shall be attained by turning the shaft 49 r
6 turns in the opposite direction from the 9,000 MHz setting.
18/ With the specified input pressurization, or output pressurization, or both, there shall be no evidence of breakdown in the input
assembly, or output assembly.
19/ The missing pulses (MP), due to any causes, are considered to be missing if the RF energy is less than 70 percent of the normal
energy level in the frequency range of 8,900 to 9,100 MHz. The VSWR shall be adjusted to that phase producing maximum
instability and the MP counted during the last 3 minutes of a 5-minute test period.
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