MIL-PRF-1/1640E
TABLE I. Testing and inspection - Continued.
22/ The power output shall be continuous over the range from F1 to F3. At no frequency in this range shall the
power output be less than then minimum value specified herein.
23/ After the holding period, the anode voltage shall be applied 150 seconds minimum after the application of the
standby heater voltage. The missing pulse count test interval of 3 minutes shall start immediately after the
application of anode voltage. The provisions of 14/ shall apply.
24/ For frequency variation measurements, the maximum peak-to-peak frequency deviation shall not exceed the
amount specified herein. The test shall be run excluding thermal drift and pushing effects. The test equipment
shall have a band pass of 10 MHz minimum at the 3 dB points. Frequency variations are defined as inter-pulse
frequency changes, commonly called clatter.
25/ In addition to regular markings, the tuner dial settings for the following frequencies shall be marked on the tube
during final testing by the manufacturer. The accuracy of these settings shall be ± 10 MHz at the start of life
under conditions of test condition 2 with the body temperature approximately 80°C measured at the point
specified on figure 1 when tuning is performed in the order of decreasing the frequency.
Frequency (MHz)
Dial setting
Frequency (MHz)
Dial setting
8,500
---
9,150
---
8,650
---
9,300
---
8,800
---
9,450
---
9,000
---
9,600
---
26/ At the completion of this test, the TUT shall meet the power output and voltage requirements of test 2 of the
conformance inspection, part 1, and the operating torque or force and resettability requirements of conformance
inspection, part 2.
27/ The frequency deviation (maximum frequency minus minimum frequency) shall not exceed the limits specified
herein when a VSWR of 1.5 minimum is introduced into the load and is varied throughout all phases.
28/ At each of the dial settings and under the operating conditions specified in 25/, the measured frequency shall not
differ from the stated frequency by more than the amount specified herein.
29/ Starting at F1 and increasing to F3, then decreasing to F1, the frequency of the TUT will be changed in 150 MHz
increments after each 50 hours (approximately) of high-voltage operation. The duration of the switching interval
between test 1 and test 2 shall not exceed 5 seconds. The following cycle shall be used for the life test:
Condition
ib (A)
Ef(V)
Duration
Standby
0
13.75
2.5 minutes
Test 1
27.5
0
25.0
Test 2
27.5
0
25.0
Off
0
0
7.5
30/ Following impact tests, the TUT shall show no mechanical failure and shall meet all power output and voltage
requirements of test condition 2 and operating torque or force of conformance inspection, part 2.
31/ Body temperature shall be measured at the point indicated in note 5 of the mechanical drawing. The TUT
serviceability shall not be impaired with a screw inserted or removed from this threaded hole.
7
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