MIL-PRF-1/1329A
TABLE I. Testing and inspection - Continued.
4/ The maximum tuner torque specified cannot be exceeded without causing permanent damage to the tube.
5/ The temperature shall be measured at the point indicated on figure 1. Temperature coefficient measurements shall be taken at 25°
intervals across the indicated temperature range. The normal anode temperature during operation is 20°C greater than ambient
temperature. At no time shall frequency change more than the specified temperature coefficient limit.
6/ In handling and mounting the magnetron, care must be exercised to prevent demagnetization. Ferromagnetic materials or energized
magnets shall not be brought within two inches of the tube.
7/ The pulse characteristics of Oscillation (1) shall be as follows: No spike or ripple shall exceed ± 7 percent of the average peak value
of voltage or current. The current pulse fall time shall not exceed 0.2 µs (max) as measured between 0 and 85 percent levels.
Pulse shall be applied directly to plates of oscilloscope.
8/ See figure 1. Heater-cathode power is applied to the BNC type connector as specified on the outline drawing. The center conductor
is the cathode connector.
9/ Reasonable care should be used in the storage, installation, and use of the tube to avoid imparting vibration or shock in excess of
the values for which it is designed to withstand.
10/ The tube shall be mounted on a test plate and vibrated along each of three (3) mutually perpendicular axes at the specified
frequency at .08 inches (2.03 mm) total excursion for 60 seconds. The tube shall meet the requirements of Oscillation 1 after
vibration.
11/ The magnetrons shall be mounted on a test plate and dropped 10 times on each of three (3) mutually perpendicular axes parallel to
the reference planes shown on figure 1. The shock pulse shall have a duration of approximately 11 milliseconds as measured at the
quarter amplitude points of the acceleration shock wave. The tube shall meet the requirements of oscillation 1 after this shock.
12/ The tuner drive mechanism shall not be "set" against either mechanical stop.
13/ The tube shall be capable of being mechanically tuned from 8,900 to 9,400 MHz by turning the tuner shaft 1.68 turns ± 17 percent
with the anode current held constant.
14/ Stability shall be measured with the VSWR adjusted to that phase which produces maximum instability. The missing pulses (M.P.)
shall be counted during the last three minutes of a test interval not to exceed six minutes, and shall not exceed the limit specified. A
missing pulse is defined as one whose energy is less than 70 percent of a normal pulse, within ± 1 percent frequency range of the
normal test frequency.
15/ Life test shall be conducted in accordance with the following operational cycle:
Condition
Duration
Ef
ib
(1)
5 minutes
0V
0
(2)
1 minute
5.0 V
0
(3)
12 minutes
5.0 V
.90 a
The above cycle shall be repeated until the accrued time of condition (3) is 300 hours; the tube shall meet end of life requirements at
that time.
16/ A tuning cycle consists of two complete excursions each in opposite directions through the tuning range of the magnetron. The tube
shall meet end of life requirements at completion of this test.
17/ The anode current shall be varied between .85 and 1.0 peak amperes at a rate sufficient to prevent thermal effects.
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