MIL-PRF-1/1688C
TABLE I. Testing and inspection - Continued.
Limits
Inspection
Method
Test
Conditions
Symbol
Min
Max
Unit
MIL-STD-1311
Conformance inspection,
part 3
Life test
---
1
Group S; F2
t
1,000
---
hrs
Life test end points:
---
Power output
4250
1
F1, F2, and F3
Po
420
---
W
RF bandwidth
4308
1
F1, F2, and F3
BW
---
3.0/tpc
MHz
Stability
4315
1
F1, F2, and F3
MP
---
1.0
%
Minor lobes
4308
1
F1, F2, and F3
Ratio
7
---
dB
Standby or preheat heater voltage shall be 16.0 V dc 5 percent. During high voltage operation, heater voltage should be
1/
adjusted to the following approximate values:
Ef (V dc)
Pi (watts)
1,200-1,400
5.5
1,000-1,200
8
800-1,000
10.5
600-800
13
400-600
15
0-400
16
2/
These periodic check tests which have been performed and have met specified requirements within 36 months need not be
performed if test requirements, material, or manufacturing processes have not changed in the interim.
3/
The value of VSWR specified excludes the tube coupling adapter.
4/
The magnetic field should be calibrated in accordance with the following procedure. See figure 2.
a.
With conventional 1/8 inch pole piece attached to the pole face of the magnet opposite the magnetron tuner, the magnetic
gap should be 1.800 inches.
b.
The magnetic field should then be adjusted for 2,700 gauss at the center of the gap.
c.
Remove the conventional 1/8 inch pole piece and replace it with the distortion pole piece.
5/
Frequency definitions:
F1 = 2.7 GHz
F2 = 2.8 GHz
F3 = 219 GHz
6/
Missing pulses shall be counted during the last three minutes of a stability test interval not to exceed 6 minutes. The stability
test interval shall first be conducted at F1 and shall be started no later than 10 minutes after the application of high voltage.
Test intervals shall then be conducted consecutively at F2 and F3.
7/
Following this test, the magnetron shall be capable of normal operation under test condition 1.
Tuning mechanism will provide full range of tuning with five 360 turns, maximum.
8/
3
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