MIL-PRF-1/1688C
OUTLINE DIMENSIONS SIMILAR TO 242-JAN (REF)
Dimensions
Dimensions
Ltr
Inches
Millimeters
Ltr
Inches
Millimeters
Min
Max
Min
Max
Min
Max
Min
Max
1130'
1630'
1130'
1630'
Conformance inspection, part 1
AU
E
---
2.156 Nom
---
54.76 Nom
AV
---
.313 Nom
---
7.95 Nom
F
---
1.359 Nom
---
34.52 Nom
AW
---
2.812 Nom
---
71.42 Nom
L
---
1.437 Nom
---
36.50 Nom
Conformance inspection, part 2
2948'
3012'
2948'
3012'
N
1.417
1.457
36.00
37.01
A
R
---
1.440 Nom
---
36.58 Nom
B
.205
.215
5.21
5.46
4448'
4512'
4448'
4512'
T
---
3.500 Nom
---
88.90 Nom
C
2948'
3012'
2948'
3012'
X
---
1.437 Nom
---
36.50 Nom
D
2948'
3012'
2948'
3012'
Z
---
.756 Nom
---
19.20 Nom
G
4448'
4512'
4448'
4512'
AC
2.287
2.307
58.09
58.60
H
AD
2.060
2.110
52.32
53.59
J
2.266 R
2.296R
57.56 R
58.32 R
2948'
3012'
2948'
3012'
AE
1.125
---
28.57
---
K
AF
2.314
2.328
58.77
56.84
M
2.029 R
2.035 R
51.54 R
51.69 R
AG
.550
.560
13.97
14.22
P
.500
---
12.70
---
AH
1.420
1.460
36.07
37.08
S
1.063
---
27.00
---
AJ
---
1.620
---
41.15
U
---
2.656R
---
67.46 R
30
35
30
35
AL
2 1/2-18 NS-2A
2 1/2-18 NS-2A
V
AN
---
.187 Nom
---
4.75 Nom
W
1.500 R
---
38.10 R
---
AP
.438
.688
11.12
17.47
Y
1.500
---
38.10
---
AR
.525
.625
13.33
15.87
AB
.803
.833
20.40
21.16
AS
---
.025 Nom
---
0.64 Nom
AK
.593
---
15.06
---
AT
---
1.740
---
44.20
AM
6.219
6.407
157.96
162.74
NOTES: (MECHANICAL REQUIREMENTS)
1. The periphery of the anode shall lie within a 2.160 inch (54.86 mm) diameter circle located as specified for non-tunable side
of anode.
2. Maximum width specified applies to area defined by broken line and circumference of radiator.
3. Center-line of maximum diameter shall be concentric with center-line of guard pipe to within 0.040 inch (1.02 mm).
4. Applies to inner conductor insert only center-line of inner conductor insert shall be concentric with center of guard pipe to
within 0.025 inch (0.64 mm).
5. Applies to straight portion of inner conductor wall.
6. No sharp edges of outside diameter at end of inner conductor.
7. Tube may be supported by plate (mounting) or guard pipe.
8. Spline for adjusting tuning mechanism is as follows: 12 teeth 48 pitch - 0.250 inch (6.35 mm) pitch diameter.
9. This annular area shall be flat within 0.015 inch (0.38 mm) (a thickness gauge 0.125 inch (3.18 mm) wide shall not enter
more than 0.250 inch (6.35 mm).
10. Pyrex glass or approved equivalent.
11. Leads shall be flexible and slack.
12. Tuning mechanism will provide full range of tuning with five 360 turns, maximum.
13. Protective guard for shipping purposes.
14. The center of the jack holes shall be within a radius of 0.100 inch (2.54 mm) of the location specified but shall be spaced
0.797 inch (20.24 mm) 0.015 inch (0.38 mm) with respect to each other.
15.
Common cathode connection marked with letter "C":
Hex locking head banana pin jack 0.594 inch (15.09 mm) long, hole 0.169 inch (4.29 mm) 0.005 inch (0.13 mm).
16.
17. Paint with heat-resistant non-corrosive paint; the following shall be free from paint-top surface of mounting plate parts above
mounting plate, screw threads on guard pipe and all surfaces inside guard pipe, tuning gear, stop assembly, and worm shaft
5
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