MIL-PRF-1/846M
NOTES:
1. Section of waveguide M85/1-073.
2.
Surface A shall provide hermetic seal with waveguide.
3.
Unless otherwise specified, the acceptance levels for all tests listed under conformance inspection, part 1, and
shall be 1.0. This specification uses an accept on zero (c = 0) sampling plan in accordance with MIL-PRF-1,
TABLE III.
4.
Jacks shall be locking type. Jack holes shall lie within .023 inch (0.58 mm) radius of specified location.
Centerlines of holes shall be perpendicular to mounting plate within 3 degrees. Conformance inspection, part
2.
5.
All metal surfaces shall be painted with heat-resistant, noncorrosive paint except surfaces A and B, tuning
mechanism, parts associated with insulator, magnet shunts, four mounting holes G, and area included within
.219 inch (5.56 mm) radius of center of each hole G (qualification inspection). Paint may be omitted from back
of output flange.
6.
With surface defined by dimension AT and reference plane A resting on a flat surface, a gauge .010 inch (0.25
mm) thick and .125 inch (3.18 mm) wide shall not enter between surfaces at any point. Conformance
inspection, part 2.
7.
Diameter AJ shall be concentric with waveguide opening within .010 inch (0.25 mm).
8.
Diameters AJ and AN shall be concentric within .005 inch (0.13 mm).
9.
A sleeve .195 inch (4.95 mm) inside diameter, .406 inch (10.31 mm) outside diameter, and 1.000 inch (25.40
mm) long shall pass over ends of shaft to face of worm bracket. Conformance inspection, part 2.
10.
Any part of assembly which extends below surface defined by reference plane A shall lie within 1.109 inch
(28.17 mm) radius of true center of mounting plate.
11.
Tolerances include angular and lateral deviations.
12.
Defines relationship between surface A and mounting holes G.
13.
Insulator shall be pyrex glass or equal.
14.
Protective cover shall be provided for output flange. Waveguide opening shall be kept covered when tube is
not in use.
15.
Common heater-cathode connection shall be identified by letter C.
16.
Four magnet shunts. Number of shunts required shall be in accordance with applicable technical information.
Unused shunts may be removed by gripping tabs with pliers and pulling away from tube.
17.
Anode temperature shall be measured at this point.
18.
Frequency markings F1, F2, F4, and F5 correspond with settings at 8,500, 8,600, 9,375, and 9,600 MHz,
respectively.
19.
Frequency is increased by turning this end of wormshaft in counterclockwise direction. Complete frequency
range is covered in approximately 125 turns. Tuning mechanism shall operate smoothly over entire
mechanical tuning range when subjected to torque of 10 inch-ounces applied to wormshaft. In equipments,
not less than 10 inch-ounces nor more than 2.5 inch-pounds shall be applied to the drive shaft. Gear and
worm threads shall be free from any obstruction.
20.
Number which appears on geneva indicates number of complete revolutions of tuning gear from 0 to 4. With
geneva and gear set at 3 and 0, respectively, frequency of tube is 9,000 ± 25 MHz under test condition 3.
21.
Surface B shall provide hermetic seal with associated mounting surface.
FIGURE 1. Outline drawing of electron tube type 2J51A - Continued.
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