INCH-POUND
MIL-PRF-1/1738D
17 August 2004
SUPERSEDING
MIL-PRF-1/1738C
23 September 1999
PERFORMANCE SPECIFICATION SHEET
ELECTRON TUBE, MAGNETRON
*
TYPE 8939
This specification is approved for use by all Depart-
ments and Agencies of the Department of Defense.
The requirements for acquiring the electron tube described herein
shall consist of this document and the latest issue of MIL-PRF-1.
DESCRIPTION: Coaxial, tunable frequency 8,500 to 9,600 MHz, pulse type, integral magnet, 250 kW rated peak power output.
ABSOLUTE RATINGS:
Parameter:
Ef
If (surge)
tk
tpc
rrv
Du
epy
ib
VSW R
Unit:
V
a
sec
---
kV
a
---
µs
kV/µs
Maximum:
15
12
---
0.35
200
0.001
28
30
1.5:1
Minimum:
1/
---
150
0.18
90 2/
---
---
15
---
ABSOLUTE RATINGS:
Temperature
Pressurization
Parameter:
Pi
pi
Body
Input bushing
Tuner stop torque
Alt
Input
Output
Unit:
W
kW
inch-ounce
ft
psia
psia
°C
°C
Maximum:
600
800
130
165
48
10,000
45
45
Minimum:
---
---
-55 3/
-55 3/
4/
---
15 5/
15 5/
PHYSICAL CHARACTERISTICS:
Dimensions:
See figure 1
Marking:
See figure 1, note 8, and 8/ 28/
Mounting position:
Any
Cooling:
Forced air 9/
Mounting support:
See figure 1 (flange)
Magnet isolation:
10/
Input coupling:
See figure 1 6/ 7/
W idth:
17 pounds (approximate)
Output coupling:
See figure 1 6/ 7/
Test condition (1): 6/ 7/
Frequency
Parameter:
Ef
tk
tpc
rrv
Du
Ib
VSW R
F
F
MHz
±
Unit:
V
sec
---
mA dc
---
MHz
1
8,500
5
µs
kV/µs
Maximum:
---
---
0.33
---
---
---
---
---
2
9,000
5
13.75
---
---
---
0.0004
11
1.1:1
F1, F2, F3
3
9,600
5
Minimum:
1/
150
0.27
180
---
---
---
---
Test condition (2): 6/ 7/
Parameter:
Ef
tk
tpc
rrv
Du
Ib
VSW R
F
Unit:
V
sec
---
mA dc
---
MHz
µs
kV/µs
Minimum
---
---
0.33
---
---
---
---
---
13.75
---
---
---
0.0006
16.5
1.1:1
F1, F2, F3
Maximum:
1/
150
0.27
180 2/
---
---
----
---
See footnotes at end of table I.
______________________________________________________________________________
GENERAL:
Qualification: Required.
_______
* Replaces Varian type SFD-382.
AMSC N/A
FSC 5960
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