MIL-PRF-1/1624B(NAVY)
TABLE I. Testing and inspection - Continued.
Limits
Inspection
Method
Notes
Conditions
Symbol
Min
Max
Unit
Conformance inspection,
part 2
Forced cooling
1143
3/ 8/
T
---
100
C
22/
Shock, specified pulse
1042
14/
11 G; t = 11 ms
---
---
---
---
Frequency pulling figure
4310
---
F = F3;
---
15
MHz
F
VSWR = 1.2:1 (minimum)
Frequency pushing figure
4311
---
ib = 14 to 16a
---
1.0
MHz/a
F
Conformance inspection,
part 3
Life test
---
24/
Group D; VSWR = 1.2
t
1,000
---
hours
minimum cycled through 2G
in 15 minutes
---
Life-test end points:
---
W
---
4250
16
Po
Power output (1)
F = F2, F3, and F4
---
W
4250
---
14
Power output (2)
Po
F = F1 and F5
18/
MHz
4308
2.5/tpc
---
RF bandwidth
BW
F = F1 through F5
dB
4308
---
6
Minor lobes
Ratio
18/
F = F1 through F5
4315
%
0.5
Stability
---
MP
18/
F = F1 through F5
1/
After thermal frequency stability has been reached at each of the frequencies of this test, F1, F2, F3, F4, F5, the curve of frequency
versus tuner position shall not deviate more than the amount specified herein from the tuning curve, figure 3, when turning the dial in
either direction.
2/
The tuning drive to the tube's tuner shaft shall be capable of supplying a minimum of 7 inch-ounces of torque (including the inertial
effects) when driven to the tube's internal mechanical stops below F1 and above F5.
3/
The temperature shall be measured at the point indicated on figure 1, only after thermal equilibrium has been reached.
4/
Pressurization of the input bushing is not required at altitudes below 10,000 feet.
5/
Prior to the application of anode voltage, the cathode shall be heated to the required initial operating temperature. This may be done
by applying 16 .0 volts 5 percent for 300 seconds minimum. Upon the application of anode voltage, the heater voltage shall be
lowered to 13.2 volts 5 percent when the tube's average current reaches 6.5 mA dc.
6/
The characteristics of the applied pulse shall be those which result in proper starting and oscillation. The rate of pulse voltage rise,
the percentage of pulse voltage ripple, and the rate of pulse voltage fall are among the most important considerations. See method
4304, figure 4304-2.
tpc
rrv 7/
kv/ s
s
Maximum
Minimum
0.1
150
100
1.0
130
100
2.2
120
100
3
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