MIL-PRF-1/846M
TABLE I. Testing and inspection - Continued.
1/
In addition to regular markings, the tuner dial readings for the following frequencies, with the exception of 9,000
MHz shall be stamped on the tube:
Frequency
Marking
8,500 ± 10 MHz
F1
8,600 ± 10 MHz
F2
9,000 ± 10 MHz
F3
9,375 ± 13 MHz
F4
9,600 ± 20 MHz
F5
These markings shall apply after thermal equilibrium under the conditions of test condition (3) at an anode
temperature of 80°C ± 10°C. These frequency ranges shall be obtained by rotating the tuning dial gear in a
continuously clockwise direction.
2/
The tube under test (TUT) may be coupled directly to a M85/1-073 waveguide with a M3922/59-007 choke
flange. However, for a minimum VSWR at this coupling, it is recommended that a specially designed choke
flange be used which mates with the angular M85/1-073 output of the tube to provide a straight section of
M85/1-073 waveguide through the coupling network.
3/
In handling and mounting the tube, care shall be exercised to prevent demagnetization. Ferromagnetic
materials or energized magnets shall not be brought within 2 inches (50.8 mm) of the tube.
4/
Unless otherwise specified, the acceptance level for all tests listed under conformance inspection, part 1, shall
be 1.0. This specification uses an accept on zero (c = 0) sampling plan in accordance with MIL-PRF-1, TABLE
III.
5/
The missing pulses (MP) shall be counted during the last 3 minutes of a test interval not to exceed 6 minutes. A
missing pulse is defined as one whose energy within a ± 1 percent frequency range of the normal test
frequency is 70 percent or less than that of a normal pulse.
6/
The rf bandwidth and minor lobes shall be within the limits specified when a VSWR of 1.5:1 is introduced in the
load at a distance no greater than one-half meter from the TUT coupling flange, the phase being adjusted to a
point to be determined by the tube manufacturer for the worst spectrum.
7/
This test shall be conducted at a sufficient number of frequencies to insure that power output is above the
minimum value throughout the specified tuning range.
8/
The pulling measurement shall be made at the frequency of maximum power output. This frequency to be
determined by the tube manufacturer.
9/
The life-test cycle shall be as specified below:
Test condition
Ib
Ef
Duration
Warm up
0
6.3
2 minutes
2
4.7
5.0
60 minutes
3
15.5
0
60 minutes
Off
0
0
58 minutes
Starting at F1, the frequency will be increased in 100 MHz increments every 10 hours.
10/ The TUT shall pass all applicable conformance inspection, parts 1 and 2, tests at the end of the specified life,
with the condition that the criteria for acceptance be modified in accordance with the life-test end points, with
accept on zero failures (c = 0).
4
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