1、 MIL-PRF-1/1112H 17 January 2012 SUPERSEDING MIL-PRF-1/1112G 27 August 1999 PERFORMANCE SPECIFICATION SHEET ELECTRON TUBE, KLYSTRON TYPE 8493 This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the electron tube describe
2、d herein shall consist of this document and the latest issue of MIL-PRF-1. DESCRIPTION: Pulsed amplifier, control grid modulated, self-focused, tunable frequency range 900 to 1,215 MHz. ABSOLUTE RATINGS: Parameter: Unit: Ef V Ec V Eb kV egy v ib a Pi W pd w Pd W po kw Po W Maximum: Minimum: 4.6 3.8
3、-50 -250 20 - 450 - 10 - 2,300 - 500 - 80 - 25 - 600 - Parameter: Unit: Pg W prr pairs/sec Du - T C Maximum: Minimum: 5 - 3,700 - 0.025 - 150 - (Figure 1, ref. T1 through T5) PHYSICAL CHARACTERISTICS: Dimensions: Mounting: Temperature reference: Output and input connectors See figure 1 1/ See figure
4、 1 See figure 1 Cooling: Weight: Marking: Initial start-up: Forced-air 2/ 30 pounds (approximate) See figure 1 5/ TEST CONDITIONS: Parameter: Unit: Ef V Ec V Eb kV egy v Pi W pd w po kw Tolerance: - 4.2 - -125 - 12.5 55 365 max 1,840 - 30 min 11.5 Notes: 3/ 4/ 5/ 6/ 7/ - 11/ 8/ 9/ TEST CONDITIONS: P
5、arameter: Unit: Du - prr pair/sec F MHz Frequency F MHz Tolerance: 0.025 - 90 3,600 - F1 and F3 F1 F2 F3 960 1,100 1,215 Notes: - - 10/ See footnotes at end of table I. _ GENERAL: Qualification: Not Required. This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1,
6、table III. AMSC N/A FSC 5960 INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1112H 2 TABLE I. Testing and inspection. Inspection Method MIL-STD-1311 Notes Conditions Symbol Limits Unit Min Max Conformance inspection, part 1 Heate
7、r current 1301 3/ Ef = 4.2 V If 30 38 A Electrode current (anode) 1256 7/ egy = 365 v ib - 4.5 A Power level (output) 4250 7/ 8/ 9/ 10/ po 11.5 - kw Electrode current (cutoff) 1256 - egy = 0 Ib - 1.0 ma Cathode emission 4214 12/ 13/ ib/ib - 10 % Conformance inspection, part 2 Direct-interelectrode c
8、apacitance 4266 - Connect shell to cathode Cgk - 150 pF Spectrum - 16/ Spec 1 Spec 2 -43 -53 - - dB dB Torque test, rf output connector - - No voltages - 200 - inch/pound Open-short circuit test - 9/ - - - - Power level (pulse droop) 4250 14/ - - 2 % Conformance inspection, part 3 Life test - 17/ Gr
9、oup D; tp = 10 s (rectangular) Psi = 1,300 W t 1,000 - hours Life test end-points: - Power level (output) Cathode emission 4250 4214 7/ 11/ 13/ 17/ po ib/ib 10.5 - - 10 kw % Qualification tests Power level (harmonic) 4250 18/ po - -50 dB Amplifier insertion loss 4257 15/ egy = 0 ib = 0 po po - - 10
10、-3 w dBm Warmup time 4303 - tk = 6 minutes (max) t = 10 seconds - po - 11.5 - - - kw See footnotes at end of table. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1112H 3 TABLE I. Testing and inspection - Continued. Inspection Method MIL-S
11、TD-1311 Notes Conditions Symbol Limits Unit Min Max Qualification tests - Continued Temperature coefficient 4027 20/ F = F2; TA = -65C to +65V F/T - +0.015 -0.021 MHz/C MHz/C Shock, specified pulse 1042 21/ 22/ Test condition J, except 6.5 ms - - - - Nonoperation vibration 1031 23/ No voltages F - 0
12、.5 MHz Operation vibration 1031 19/ (max)(max)VV- 3.0 % Permanence of marking 1105 - - - - - 1/ The tube described herein shall be designed to be mounted in any position using the four .375 inch (9.53 mm) diameter threaded inserts on the collector end plate and a suitable strap around the mounting b
13、racket shown on figure 1. 2/ The tube under test (TUT) shall be cooled at sea level pressure with 18 psia per minute of 0.0730 pounds per cubic foot density at a pressure drop not greater than 2.0 inches of water. 3/ The TUT shall stabilize within the limits specified herein after a 5 minute (maximu
14、m) preheating period. 4/ The TUT shall not be operated without a negative-grid bias when the beam voltage has been applied. The TUT shall be protected from this condition by overload circuits included in the high voltage circuits. The output of the dc beam supply shall be followed by a series resist
15、or approximately 10 ohms to prevent serious surges of beam current through the tube. 5/ The following procedure shall be followed for all new tubes and tubes which have not been operated during the preceding 3-month period. a. Reduce the grid drive voltage to zero (do not change the bias voltage fro
16、m its normal -125 V setting). b. Turn on main power and apply rated filament and 125 V bias voltage for 15 minutes. c. Apply a beam voltage of 7 kv for 15 minutes. d. Increase the grid drive from zero to a value which gives 10 ma of average beam current. e. Apply the rated beam voltage and increase
17、the grid drive to 60 mA average beam current. Continue to increase the grid drive to values which provide 10 mA beam current increases every 5 minutes until the current reaches 90 mA and operates at 90 mA for 5 minutes. The tube is not considered to be properly aged and ready to be placed into servi
18、ce. 6/ The control grid shall be driven with a shaped pulsed pair which has a peak amplitude as specified herein with reference to the negative bias voltage (total grid swing). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1112H 4 TABLE I
19、. Testing and inspection - Continued. 7/ The eg pulse shall be of such shape as to provide rf output voltages which conform to the following diagram: a. The eg pulses shall be composed of pairs spaced 12.0 0.5 microseconds between centers. The repetition rate shall be 3,600 90 pairs per second. b. T
20、he tube shall not oscillate with the input line disconnected and the input and output resonators tuned to the same frequency provided that the middle resonator is detuned by one turn of one tuning nut from resonance. c. The output of the grid modulator can be loaded with a shunt impedance, if necess
21、ary, to obtain the proper waveform to drive the TUT grid. 8/ The TUT shall deliver the rated power specified herein into a transformer adjusted load which has a VSWR of 1.5:1, or less. 9/ The TUT nor its output coupling shall be damaged if the TUT output connector is open, short circuited, or termin
22、ated in any resistance or reactance or combination thereof between the limits of open and short circuit when the TUT is tuned in equipment in accordance with instructions supplied by the tube supplier. 10/ A tuning curve shall be supplied with each tube. The frequency of each resonator can be set ap
23、proximately by adjusting the tuning ring spacing of each resonator according to the tuning charts. Tuning rings shall be parallel with one turn of a tuning nut after final adjustment. When adjusted to any operating frequency in the range from F1 to F3 in accordance with the individual cold tuning ch
24、arts, and when supplied with rf drive over the range of nominal frequency 0.5 MHz, the tube will deliver a minimum rf output power of 30 watts into a 50-ohm resistive load. 11/ The rf drive shall be applied to the input resonator of the TUT. The rf drive may be either pulsed or cw. When a rectangula
25、r pulse drive is used, synchronization shall be provided to allow the control-grid pulse to appear in time phase with rf pulse. The rf drive pulse shall be free from frequency modulation which would prevent testing the tubes to the performance limits indicated. 12/ This test shall be performed at th
26、e conclusion of the holding period. 13/ With the TUT operating, the filament voltage shall be decreased from 4.5 to 3.8 volts. The percentage change in anode current shall be within the limits specified herein. 14/ After account has been taken of existing differences in the amplitude of adjoining eg
27、 pulses, and correction made for the 5:4 power relationship between the output voltage pulse amplitude and droop in Eb, there shall be in addition not more than 2 percent difference between the maximum amplitude pulse and the minimum amplitude pulse in a group of 24 successive pulses. These 24 pulse
28、s may be evenly spaced in a total interval not exceeding 330 microseconds. One tube per month shall be tested with no failures per lot. 15/ With the TUT operating under specified test conditions, removal of the grid pulse potential shall reduce the radiated rf and the transmitted output to the maxim
29、um specified. In the absence of beam current and for any condition of tuning, the maximum level of radiated rf or the transmitted output is specified with respect to the rf drive power. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1112H
30、5 TABLE I. Testing and inspection - Continued. 16/ Spectrum test: a. The requirements of b. shall be met under the following conditions: (1) a suitable grid drive pulse such as shown on figure 2; (2) an output voltage pulse of 3.5 s when measured at half amplitude; (3) a peak drive voltage set at a
31、point in the range 365 55 volts with reference to the bias level of -125 volts dc; (4) the input and center cavities suitably detuned as described in the spectrum check; and (5) peak power output of at least 11.5 kw. b. The frequency spectrum of the output rf pulses shall be such that the energy in
32、each 500 kHz wide band, centered 800 kHz from the center frequency shall be greater than 43 dB down from the energy in the 500 kHz band centered on the carrier frequency; further, the energy in each 500 kHz wide band, centered 2 MHz from the center frequency shall be greater than 53 dB down from the
33、 energy in the 500 kHz band centered on the carrier frequency. 17/ The beam current shall be measured at 0, 24, 48, 250 and 500 hours. Power output shall be measured only at 0, 48, 250, and 500 hours. Average power may be adjusted by means of variable pulse repetition rate and grid voltage. 18/ The
34、second harmonic of the fundamental drive frequency shall be below the limit specified herein when the output of the tube is examined under Po conditions by spectrum analyzer techniques at the drive frequencies of F1, F2, and F3. 19/ The tube shall be vibrated at 15 and 135 Hz for 3 minutes at each f
35、requency. The vibration level shall be 2.5 Gs and shall be applied in the Z-direction. Before and after this test, the TUT shall satisfy the requirements of conformance inspection, part 1. 20/ The TUT shall be installed in a temperature chamber with external rf connections provided from each cavity.
36、 The body temperature coefficient is measured by tuning each tube cavity to resonate with the modulated output of a signal source operating at the specified frequency. Absorption of each cavity and a monitoring frequency meter are viewed superimposed on an oscilloscope presentation of the mode. The
37、frequency of each cavity is measured at room ambient temperature and at the specific temperature extremes. The temperature coefficient TF shall be within the specified limit. 21/ The TUT shall be shocked with 3 shock pulses in each of the +X, +Y, and +Z axes of the tube. The TUT shall then satisfy t
38、he requirements of the conformance inspection, part 1, power output test. 22/ The TUT shall be mounted in a shock-mounted rack resonant at 35 5 Hz at normal vibration amplitude (less than 0.100 displacement). This platform shall exhibit these frequency characteristics in all directions of applied sh
39、ock. The deflection characteristics of this shock-mounted rack shall be the same as, or similar to, that of Barry Corporation Shock Mounts, Type C-2080-T6-SB, or equivalent. 23/ The resonant frequency of each resonator shall be set at F2 2 MHz by “cold test“ methods. After vibration, the cold resona
40、nt frequency of the respective resonators shall be within the limits specified herein of the original setting. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1112H 6 FIGURE 1. Outline drawing of electron tube type 8493. Provided by IHSNot
41、for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1112H 7 FIGURE 1. Outline drawing of electron tube type 8493 - Continued. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1112H 8 NOTES: 1. Metric equi
42、valents (to the nearest 0.01 mm) are given for general information only. 2. Dimensions without tolerances are for information only and are not required for inspection purposes. 3. Output connector shall mate with connector UG-1126/U. 4. Connectors shall mate with Plug M39012/16-0001. 5. Provision sh
43、all be made for 1.250 inch (31.75 mm) tuning travel. 6. Axis of tube shall be perpendicular to collector end-plate within .015 inch (0.38 mm) for every inch, assuming parallel tuning. 7. Allowable deviation of connectors from true position on centerline. 8. Allowable deviation of seal-off tip from t
44、rue position on centerline through mounting holes as shown. 9. Pictorial configuration is for reference purposes only. 10. Tuning screws should be free and clear of all paint. FIGURE 1. Outline drawing of electron tube type 8493 - Continued. Ltr Dimensions Inches Millimeters Min Max Min Max Qualific
45、ation E 4.600 4.850 116.84 123.19 G .172 .203 4.36 5.16 M 1.563 1.688 39.70 42.88 Q - 9.000 - 228.60 R - 7.750 - 196.85 S 5.719 5.781 145.15 146.73 U - 4.250 - 107.95 W 43.5 46.5 Conformance inspection, part 2 A 17.250 19.000 438.15 482.60 B 6.844 6.906 173.84 175.41 C 5.344 5.406 135.74 137.31 D 10
46、.000 10.250 254.00 260.35 F 2.625 2.875 66.67 73.03 H 3.375 3.438 85.73 87.33 J - 4.565 - 115.95 N 1.188 1.313 30.17 33.35 T 2.844 2.906 72.23 73.81 V 3.024 3.039 76.81 77.19 Y - 2 Z 115 125 Nominal dimensions (see note 2) P .625 15.87 X 5 5 Provided by IHSNot for ResaleNo reproduction or networking
47、 permitted without license from IHS-,-,-MIL-PRF-1/1112H 9 FIGURE 2. Range of grid-drive waveform. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1112H 10 FIGURE 4. Heater and cathode lead assembly. FIGURE 3. Grid lead assembly. Provided by
48、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1112H 11 NOTES: 1. Dimensions are in inches. 2. Metric equivalents (to the nearest 0.01 mm) are given for general information only. FIGURE 4. Heater and cathode lead assembly - Continued. Ltr Dimensions Inches Millimeters Min Max
