1、9999906 20b2432 751 Parameter: Unit: Maximum: CWoscoramp Anode mod cw osc or amp Test condition: 41 1 INCH-POUND I MIL-PRF-l/1037E 11 March 1998 SUPERSEDING 16 February 1973 MlL-E-l/1037D pg tk TE T (anode shank) W si sec (min) OC 51 “C (see note e of figure 1) 2 60 200 200 60 200 200 2 - 300 - -. P
2、ERFORMANCE SPECIFICATION SHEET ELECTRON TUBE, NEGATIVE GRID (MICROWAVE) TYPE 6897 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 iss
3、ue of MIL-PRF-1. DESCRIPTION: Triode, planar, ceramic and metal. See figure 1. Mounting position: Any. Weight: 2 ounces nominal. 71 Barometric pressure, reduced mmHg 30 30 - li The transit-time heating effect of the cathode shall be compensated for by a reduction in heater voltage after dynamic oper
4、ation of the tube has started. The bad heating is a hinction of frequency, grid current, grid bias, anode current, duty cycle, and circuit design and adjustment. There is an optimum heater voltage which will maintain the cathode at lhe correct operating temperature for a parcular set of operating co
5、nditions. A maximum variation of i5 percent from optimum is permitted. No reduction in heater voltage is required up to and including 500 MHz. AMSC N/A 1 of 11 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. FSC 5960 Provided by IHSNot for ResaleNo reproduction or n
6、etworking permitted without license from IHS-,-,-MIL-PRF-111037E 1,200 volts is at the crest of the audio wave. Up to 1 O0 watts dissipation is allowable with forced-air cooling of the anode. For 1 O0 percent modulation including dissipation resulting from power supplied by the modulator. The maximu
7、m instantaneous peak grid voltage for CW ratings shall be within the range of +30 to -400 volts. Maximum envelope temperature shall be limited to the specified maximum of 200C under all operating conditions. Where emphasis is placed on long life and reliability, lower tube envelope temperatures shal
8、l be used. Sufficient conduction or convection cooling shall be provided for all seals to limit temperatures in accordance with footnote 31. For anode cooling, an airflow of 12.5 dm minimum shall be supplied at sea level, and with airflow at 25C maximum directed with a cowl as shown on Drawing 157JA
9、N. Where long life and consistent performance are factors, cooling in excess of minimum requirements is normally beneficial. Unless otherwise specified, conduction cooling or an airflow of up to 12.5 cfrn may be supplied for anode cooling in all electrical tests involving application of heater volta
10、ge. GENERAL: Qualification - Required. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Inspection kiethod MIL-PRF-111037E TABLE I. Testina and inspection. Conditions Conformance inspection, part1 81 1- 1331 _I nsulation of electrodes F = 1.85 GHz I
11、 5 MHz; Ebb = 600 V dc; Edlb = 100 mA dc; Pd = 2.5 W Ef = 5.8 V No voltages No voltages ower oscillation fil 91 1261 - 2212 1306 1316 1031 Electrode voltage (1) Total grid current ulse emission (1) (grid) Ec/lb=l.OmAdc See figure 2 Pulse emission (l), except Ef = 6.3 V Edb=lOmAdC; Ebb=300Vd Rp = 10,
12、000 ohms; Zurrent division (long pulse) kleater current Conformance insrmtion, Ebb = 1.OOO Vdc;Ib=90mAdc; Ef = 5.0 V Eb = 145 V dc: EC = -10 to -150 V dc; egklik = 750 ma; Ef = 5.5 V; prr = 11 it 1 pps; tp = 4,500 ps (min); slope = 0.5 percent; ripple = 0.1 percent tr=tf = 25 ps; Pulse emission (1).
13、 except egkhb = 400 ma: Ef = 6.3 V eceptance level 0.65 0.65 0.65 0.65 0.65 0.65 0.65 - I- .- - - - - I - spection eve1 or code R Po Ec IC Aik e!# IC If Po Cin Cout CgP I- AF Ec - Aik Sm Mu EP Limits Min 50 15 -1.3 -_ _-_ 11 210 0.95 - 16 6.0 1.89 0.01 8 _I +O5 -7 - - 22,001 75 -_ - Max - -_ -3.5 -3
14、 120 19 325 1.10 - _-_ 7.0 2.13 3.029 _-_ -3.0 -15 _- 60 !7,50 115 1 O0 - Unit See footnotes at end of table. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ MIL-PRF-L/L037E 99999Ob 20b2435 460 H Inspection Sonformance inspection, a .fe test (1)
15、31 .fe-test (1) end point: Life test (1) .fe test (2) 41 .fe-test (2) end point: Power oscillation Periodic-check tests 3arometric pressure, reduced El lariable frequency vibration 51 111 E! libration-fatigue a g/ libration-fatigue test end point: Total grid current I! roque 11 roque-test end point:
16、 Total grid current Shock s/ 51 fil Shock-test end point: Total grid current 11 Method _ 1236 1002 1031 1031 1266 - 1266 1041 1266 MIL-PRF-111037E TABLE I. Testinq and inspection - Continued. Conditions Sroup C; F = 500 MHz (min): Ebb = 800 V dc; Ib = 80 mA dc; nitial Po = 27 W (min): Ef = 6.0 V; t
17、= 500 hours Group D; Ef = 5.0 V; F = 2.0 GHz (min); Ebb = 900 V dc;lb = 80 mA dc; EcMax PO; t = 200 hours Pressure = 30 mmHg (max); voltage = 1.000 Wac; F = 55 to 500 Hz; 10 G peak min); Edlb = 10 mA dc; Rp = 10.000 ohms; Ebb = 300 V dc Eb = EC = O; Ef = 6.0 V TA=30“f 10C No voltages 400 G peak (min
18、): duration = 0.5 ms (min); no voltages; x, z+. and 2- axes Symbol A PO t _- A PO t - EP t IC _I IC IC Limits See foomotes at end of table. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TABLE I. Testinta and inspection - Continued. - 11 Torque te
19、st shall be performed as follows: (a) The tube shall be held securely at the cathode connection. A force of 5 pounds shall be applied to the heater cup without perceptible shock. This test may be made by applying the force at right angles to the inside of the cup at a point 0.109 inch (2.n mm) f 0.0
20、16 inch (0.41 mm) from the cathode end of the tube. An approved equivalent method may be used. The heater cup shall not loosen or short circuit on the cathode connection. , Points Capacitance (pF) Frequency (GHz) Cse a! (b) A toque of 15 inch-pounds shall be applied between anode and cathode without
21、 shock. (c) A toque of 40 inch-pounds shall be applied between anode and grid without shock. - 2/ Test four tubes selected at random from the first production lot of each year. If more than one tube fails to pass the specified end points, the failed test shall become a part of conformance inspection
22、, part 2, with acceptance level of 6.5, inspection level S3, on all lots in process. After three consecutive submissions, the test shall revert to a 4-tube annual test. - 3/ Life test shall be tun in cavity in accordance with Drawing 160JAN (coupling: probe feedback and probe output) as a self-excit
23、ed oscillator. 1 2 3 4 s/ Life test shall be run in a self-excited oscillator cavity. - 5/ Test in jig in accordance with Drawing 159JAN. - 61 Other tube contact configurations may be used provided the tube contact area remains unchanged and the socket. jig, or cavity gives equal performance. Mounti
24、ng of the jig, socket. or cavity may be at the option of the manufacturer. - 7/ The following does not apply: Tubes which show permanent or tap shorts or open circuits following the applicable test. - 8/ All tests listed under conformance inspection, part 1, are to be performed at the conclusion of
25、the holding period. - 9/ Test to be made in cavity in accordance with Drawing 160JAN. The cavity shall be connected to a standard load with a VSWR less than 1.5. The ouput coupling from the oscillator and grid or cathode resistor, or both, may be adjusted for maximum power OuW. - 1 O/ Test 10 tubes
26、seleced at random from the first production lot of each calendar year and approximately every 90 days during the year. If more than one tube fails to pass the specified end points, the failed test shall become a part of conformance inspection. part 2, with acceptance level 6.5. inspection level S3.
27、on all lots in process. After three consecutive successful submissions, the test shall revert to a 10-tube quarterly test. This is a nondestructive test except in case of failure. - 1 I/ Perform test on 10 tubes selected at random from the first production lot each calendar year. If more than one tu
28、be fails, the test shall become a part of conformance inspection, part 2, with acceptance level 6.5. inspection level S3. After three consecutive successful submissions, the test shall revert to an annual 1 O-tube test. - 12/ Test to be conducted in power amplifier cavity. Driving power is defined a
29、s the net power delivered to the amplifier cavity input terminals and the reflected power is to be subtracted from the incident power to obtain the net driving power. The output tuning and load coupling are to be adjusted for maximum power output. - 13/ Measured in socket in accordance with Drawing
30、158 JAN. - 14/ Grid - anode resonance: Test in cavity in accordance with Dtawing 278JAN. Cavity shall resonate at 1.354 GHz i 2.0 MHz with tuning slug in accordance with Drawing 2JAN at TA = 25“ i 5C. When plotted on graphs of resonant frequency versus grid-anode capacitance, the tube under test sha
31、ll be represented by a point within a parallelogram whose four comers are located by the foilowing points: 1.89 1.92 1 .a9 1.95 2.13 1.87 2.13 1.90 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-m 9939906 2062437 233 m TABLE I. Testing and inspectio
32、n - Continued. - 151 Test shall be made in cavity in accordance with Drawing 281-JAN. Calibrate the circuit by adjusting the cavity until the frequency of resonance is 2.0 GHz f 5 MHz at room temperature, with a tube which meets the resonance test requirements. In the grid- distortion test, the freq
33、uency shall first be measured with Ef = 6.3 volts, then the grid dissipation increased to 2 watts with Eb = -150 V dc. The change in frequency shall be not greater than the limit specified herein. Cooling air at room temperature may be used. - 16/ Voltage shall be 60 Hz ac applied between anode and
34、grid. No other voltages shall be applied. There shall be no evidence of failure as indicated by an arc-over. Perform test on 1 O tubes selected from the first production lot of each year. If more than one tube fails, the test shall become a part of conformance inspection, part 2, with acceptance lev
35、el 6.5, inspection level 53. After three consecutive successful submissions the test shall revert to a 10-tube annual test. This is not a destructive test. - 17/ The tube shall be mounted in socket in accordance with Drawing 276Jan and vibrated with simple harmonic motion. The peak acceleration over
36、 the frequency range shall be within f 20 percent of the reference acceleration at 1 O0 Hz. The frequency shall vary from 55 to 500 Hz and return to 55 Hz with approximately logarithmic progression and shall require 4 minutes minimum, 6 minutes maximum to traverse the range. Each tube shall be vibra
37、ted through one complete sweep cycle in each position X and Z, except that if the cumulative result of tests on 50 or more tubes of a cortstniction show that more than 75 percent of the tubes have higher output voltages in one position, subsequent measurements need to be taken only in the position g
38、iving the higher reading. The voltages specified herein shall be applied to the tube during vibration. The value of the alternating voltage, Ep, produced across the resistor, Rp, as a result of vibration shall be measured with a suitable device. This device shall have an appropriate voltage range, s
39、hall have the ability to measure, with an error of less than 10 percent, the rms value of a sine wave of voltage at all frequencies from 20 to 20.000 Hz. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-L/L037E = 9999906 2062438 L7T MIL-PRF-
40、l/1037E Y AXIS 4 OTES 2.3 AND 9 - ANODE CONTACT SEE NOTES 3 AND SURFACE LO -+u+ z+ AXIS z- t 1 AXIS FIGURE 1. Outline drawina of electron tube iwe 6897. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-PRF-L/L037E 9999906 2062439 006 Inches Min
41、 Mm MIL-PRF- ll1037E Millimeters Min Mm - C D I B I - I 1.534 I - I 38.96 I I _- I 1.365 _ 34.67 1.289 I 1.329 32.74 33.76 . JI 0.766 NI 1 .O25 IF1 0.948 I 0.972 I 24.08 I 24.69 I 0.826 19.46 20.98 1 .O35 26.04 26.96 I G I 0.462 1 0.477 I 11.73 I 12.12 I RI 0.655 I 0.665 I 16.64 I 16.90 1 0.213 0.22
42、3 0.315 0.325 0.776 0.792 19.71 20.12 0.040 Conformance inspection, pari 3 henodic check) (see note 2) 0.040 0.125 0.1 85 3.18 4.70 0.025 0.046 0.64 1.17 1.234 1.264 31.34 32.1 1 0.650 0.850 16.51 21.59 0.035 0.361 1 .O40 1.240 26.42 31.50 Electrode contact areas (see note 12) AY I 1.534 I 1.728 I 3
43、8.96 I 43.89 AZI 1.475 I 1.815 1 37.47 I 46.10 FIGURE 1. Outline drawinp of electron tube ivpe 6897 - Continued. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-L/1037E m 999990b 2062440 828 m MIL-PRF-111037E NOTES: 1. 2. 3. 4. 5. 6. 7. a.
44、9. 1 o. 11. 12. 13. Insulation material is required between heater and heater-cathode, and it shall be securely affixed. These dimensions shall be tested on 10 tubes per month when in continuous production. Failure of more than one tube to meet tolerances for any dimensions shall cause that dimensio
45、n to become, for all lots in process, part of conformance inspection, part 2. Silver plated 30 MSI minimum. Note 2 shall apply. Plating not required over radiator and radiator support of copper, aluminum, or approved equivalent. This surface shall be used for measurement of anode shank temperature.
46、Holes for tube extractor through top fin only, Inner edge of heater and outer edge of cathode RF connection shall be free from burrs and sharp edges. This fin shall withstand a 6 inch drop test without loosening and without distortion as judged by ability to maintain dimension K. Note 2 shall apply.
47、 Distortion of fins permissible provided distance between adjacent fins at any point on circumference meets tolerances for dimension K. Eccentricity of contact surfaces shall be gauged from center line of reference and shall be as follows: Note 2 shall apply. Contact surface TIR maximum Reference An
48、ode Grid Heater .O20 Cathode .o20 Cathode .o12 Cathode Diameters N. R. T and U shall apply throughout entire contact areas as defined by dimensions AW, AX, AY, and AZ, respectively. Dimensions in electrode contact areas table are for sodtet design purposes and are not intended for inspection purpose
49、s. This surface shall not be used for clamping or locating. Minimum flat dimension. FIGURE I. Outline drawing of electron tube tvpe 6897 - Continued. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-PRF-l/l037E 99999Ob 20b244L 764 m MIL-PRF-111037E 110 V 60% SUPPLY VARIAC bQ RL COIL INTERLOCK
