MIL-PRF-1/296E
TABLE I. Testing and inspection - Continued.
Inspection
Method
Conditions
Symbols
Limits
Limits
Units
MIL-STD-1311
Min
Max
Conformance inspection, part 3
-Continued
RF glow test
---
---
see note 5
---
---
---
Resonant frequency
---
9250.5
MHz
1Q22Fo
9249.5
9280.5
MHz
1Q23Fo
9279.5
9310.5
MHz
1Q24Fo
9309.5
9280.4
MHz
5846Fo
9279.6
9308.5
MHz
6040Fo
9307.5
9312.5
MHz
6041Fo
9311.5
Qualification
---
T = 55C to 100C
Temperature cycle (3)
---
9250.3
MHz
1Q22Fo
9249.7
9280.3
MHz
1Q23Fo
9279.7
t = 30 minutes
9310.3
MHz
1Q24Fo
9309.7
see note 3
9280.3
MHz
5846Fo
9279.7
9308.3
MHz
6040Fo
9307.7
9312.3
MHz
6041Fo
9311.7
Fo
Room temperature to 0C
Temperature compensation (2)
---
0.3
MHz
---
Fo
Room temperature to -25C
0.7
MHz
---
Fo
---
1.0
MHz
Room temperature to -40C
---
1.2
MHz
Fo
Room temperature to -55C
see notes 4 and 7
Atmospheric pressure test
---
---
0.15
MHz
Fo
P = Atmospheric to 45 psi
---
0.15
MHz
Fo
P = Atmospheric to 5 in. Hg
NOTES:
1. Electrical measurements are to be made with a standard frequency source having an absolute accuracy of the order of
1 part in 500,000. The cavities shall be tested mounted between UG-40/U chokes in RG-52/U waveguide and with a
voltage standing wave ratio less than 1.05 due to resistive match looking into each of the chokes between which the
cavity is mounted.
2. The difference in resonant frequency before and after vibration shall not exceed the limits specified.
3. The cavity shall be subjected to three complete cycles between the specified temperature extremes. The cavity may
be allowed to come to equilibrium at room temperature in passing from one extreme to the other. The cavity shall be
maintained at the extreme temperatures for the specified time during each cycle. When the tube has come to
equilibrium at room temperature at the conclusion of the last two half cycles, the resonant frequency shall be measured
and shall be within the specified limits.
4.
After temperature cycling described in note 3, the cavity shall be brought to equilibrium at the specified extreme
temperature for 30 minutes and then returned to equilibrium at room temperature. Then it shall be brought to the
specified extreme temperature again and allowed to return to room temperature. Resonant frequency measurements
shall be made at approximately 20C temperature intervals while returning to room temperature. At no temperature
shall the resonant frequency differ from the value at room temperature by more than the specified amount.
3
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