DLA MIL-PRF-1 208G-1998 ELECTRON TUBE GAS SWITCHING TYPE 1B27《1B27气体开关型电子管》.pdf

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1、 MIL-PRF-L/ZOG Parameter: li Ebb (open circuit) Incident power Du Maximum: 200 -1,000 100 0.0005 - Unit: pA dc V dc kw - - Minimum: 100 -750 U Alt ft 10,000 -.- I INCH-POUND I MlL-PRF-l/208G Parameter: F tP prr Du 12 Unit: MHz PPS _ pA dc 12c Test 1 : 3,300k0.5 % 0.5 1,000 0.0005 note 6 Test 2: 3,30

2、0 * 5.0 % 0.5 1,000 0.0005 1 O0 22 June 1998 SUPERSEDING Incident power kw 5 50 MI L-E-l/208F 27 October 1970 PERFORMANCE SPECIFICATION SHEET GEN ERAL: Qualification - Required. AMSC N/A 1 of 10 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. FSC 5960 Provided by IH

3、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ nIL-PRF-L/ZOBG = 9999906 2066346 T2Li v. .- . * i MlL-PRF-l/208G TABLE I. Testins and inwection. Inspection partl Ignitor ignition time Ignitor voltage drop ignitor interaction (AQ) Tuning range Flat-leakage power

4、Intrinsic Q (relative) Temperature cycling Conformance insDection, Dart:! Degradation due to vibration Dielectric material strain Ignitor oscillation Periodic-check tests Temperature coefficient of frequency (method A) Recovery time Conformance insDection, Life-test provisions Life-test end points I

5、gnitor interaction (AQ) Recovery time Method 4401 4406 4421 4426 4452 4475 1 027 4021 41 O1 441 1 4466 4471 -_ _- 4421 4471 Conditions G=675Vd:Iz=200 pAdc IZ = 100 pA dc Iz = 200 p4 dc (note 4) note 5 Test condition 1 (note 6) F = 3,000 MHz (note 7) note 1 notes 8 and 9 note 10 note 11 F = 3,160 MHz

6、 (note 2) Test condition 2 (note 3) Group C; Ir = 200 pA dc Iz = 200 pA dc (note 4) Test condition 2 (note 3) Symbol 500 - - Limits max 5 525 0.1 _ 25 40 _ - _- 0.5 20 NOTES: 1. The tube shall be clamped in the “ARO“ cavity, as shown on Drawing 143-JAN, and subjected to 10 of the temperature cycles

7、specified. Not less than 24 hours after the temperature test, the tube shall pass the leakage power test. (See method 4452.) 2. This test shall be made with the tube mounted in a cavity as shown on Drawing 142-JAN. 3. Ignitor series resistance shall be 0.5 MR. The loss of signal in the tube, at the

8、specified time after the start of the transmitter pulse, shall not exceed the loss at 800 to 1,000 ps after the pulse, by more than 3 dB. 4. With the ignitor current adjusted to the given value, the change in intrinsic Q, as measured in note 7 (second test), shall be within the limits specified. Uni

9、t 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI L-PR F-l/208G TABLE I. Testino and Inswction - Continued. 5. The test shall be made in the equipment specified in note 7. The tube shall cover a tuning range from less than 2,600 MHz to more than

10、 3,000 MHz. No tube shall require less than five complete turns of the tuning screw to cover this range. As the tuning screw is turned through its complete range, the transmitted power shall show only one dip. 6. After a shelf life of 7 days, mount the tube in cavity as shown on Drawing 263-JAN. The

11、 peak leakage power shall be averaged over the pulse length. Two measurements of the leakage power shall be made. The first shall be made with ignitor current at 100 JA dc and the second, with no ignitor current. 7. The intrinsic Q shall be measured in the equipment depicted on figures 2 and 3, at a

12、 frequency of 3,000 MHz * 1 percent. Ten feet of 50 R lossy cable shown (see figure 4) shall be used as a termination in order to provide a matched output. The 6- to 8- dB loss in the termination is sufficient to eliminate the mismatch of the transitions. With the attenuator flap raised completely o

13、ut of the guide, the tube shall be tuned to resonance and VSWR measurements made, covering a band of 8 to 10 MHz centered at the resonant frequency. The value for r, which is the VSWR at the frequency for which the normalized reactance of the tube is equal to unity, is given by the equation: r= J(2R

14、2+2+11R)+l+JRi-;i 42R2 + 2 + 1 / R) + 1 - %hiTl Where: R = effective shunt resistance across the guide (introduced by the tube) ro, the VSWR at resonance, is given by ro = (1/R) +1 A curve of r versus ro is shown on figure 5. After determining r from figure 5, the frequencies fi and f2, correspondin

15、g to Values of normalized reactance equal to unity, are obtained from the curve of VSWR versus frequency. A sample of this determination is shown on figure 6. The intrinsic Q is then determined by: Where: fo = resonant frequency of the tube. h = upper frequency at which normalized reactance equals u

16、nity. h = lower frequency at which normalized reactance equals unity. R = effective shunt resistance of the tube. The intrinsic Q can also be measured by a relative method in the equipment as shown on figure 3. The ratio of power in the load with the TR detuned to the power with the TR tuned is: P =

17、 (1 + 1/2R)2 Where: R = effective shunt resistance of the tube. A plot of P versus 1/R is shown on figure 7. If the intrinsic Q and R are measured for a TR tube in the test equipment as above, the Q of any other TR tube may be found by determining R and inserting it in the formula: Where: Qol and RI

18、 are the constants for the caiibrated tube. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-PRF-L/208G 9999906 2066348 8T7 MIL-PRF-1RO8G TABLE I. Testinci and Inscection - Continued. 8. On evidence of Satisfactory conformance, the inspector may

19、 limit this test to 10 tubes per month when the tube is in continuous production. 9. The tube shall be mounted in a cavity as shown on Drawing 142JAN and tuned to 3,160 MHz f 1 percent. The tube and cavity shall be vibrated in the direction of the keep-alive axis for 12 hours with an amplitude of mo

20、tion of 0.040 inch. Aiter this test, the tuning shall have changed not more than 1 MHz from its initial value, and the tube shall satisfy all other electrical tests of this specification. 10. The entire tube shall be immersed for the purpose of testing the glass portions of the tube. 11. No tube sha

21、ll require more than 50 pA dc ignitor current to prevent relaxation oscillation of the ignitor current. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.- SEE flIL-PRF-L/ZDBG W 9999906 2066349 733 MlL-PRF-l/208G NOTES: 7. Dimension L may be increas

22、ed 0.03 inch (0.76 mm) by solder. 2. Dimensions without tolerances are for information and are not required for inspection purposes. 3. The acceptance level for the combined mechanical defectives in conformance inspection, part 1, shall be 1 .O percent. 4. Sealsff tip is optional and must not extend

23、 above dimension J base line. 5. Contact portion of disk measured radially must be free from splits or tears and must be smooth and flat to the extent controlled by dimension P. Figure I. Outline drawina of electron tube tvDe 1 B27. 5 Provided by IHSNot for ResaleNo reproduction or networking permit

24、ted without license from IHS-,-,-Figure I Notes. - Continued. 6. Contact disks shall be gold plated 1 O MSI minimum or silver plated 15 MSI minimum on external surfaces. 7. Contact disks shall be concentric within 1/64 inch (0.40 mm). 8. A screwdriver slot is provided in the head of the tuning screw

25、 and is exposed when knurled tuning knob is removed. 9. There shall be a perceptible clearance between the cone ends when the tuning screw is at its extreme inner position. OC OUTPUT CRYSTAL TUNING CALIBRATED SCREW VARIABLE ATTENUATOR A- /-. 1.50 INCH X 3.00 INCH WAVEGUIOE (38.10 Di1 (76.20 .i) FIGU

26、RE 2. EauiDment-intrinsic Q and tunina ranae measurements. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-PRF-L/ZOG 9 9999906 2066353 393 1 1/2-24 UNC-EA SAME AS STD WAVEGUIDE WALL SECTION A-A TO BE FLUSH WITH INSIDE OF MATL: BRASS SILVER PL

27、ATED q f. 999i, 003 SECTION B-B THICKNESS, WAVEGUIDE WALL INCHES 0.001 0.002 0.003 0.004 0.040 0.080 0.093 0.437 0.508 0.590 0.670 0.875 0.937 0.999 1 .o62 1 .O75 1.312 2.150 2.250 2.406 2.625 MM 0.03 0.05 0.08 0.10 1 .o2 2.03 2.36 11.10 12.90 14.99 17.02 22.23 23.80 25.37 26.97 27.31 33.32 54.61 57

28、.15 61 .ll 66.68 FIGURE 3. Intrinsic Q and tuning ranae cavity. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-PRF-IJ208G 9999906 20bb352 228 MIL-PRF-lRO8G CAVITY 50-ohm lossv cable. 3 rl dB ro dB FIGURE 5. Curve r versus rQ. 8 Provided by IH

29、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-b/208G 999990b 2066353 Lb4 W MIL-PRF-1RO8G FIGURE 6. SamDle determination of VSWR versus frequency. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-PRF

30、-L/2086 9999906 2066354 OTO M IL-PR F-1 E08G CAVITY POWER INDI CAT OR GEN- 37-73 Zo PAD 12.5 10.0 1 20 LOGT 7.5 5. O 2.5 O Custodians: Navy - EC Air Force - 85 Review activities: Army - CR Navy - AS, CG, MC, SH Air Force - i 1.99 Zo DETECTOR O 2 4 6 0 10 12 14 P POWER DROP (DBl=lO log2=10 log p p2 FIGURE 9. Plot of P versus 1/R. Preparing activity: (Project 5960-3449) DLA - CC 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-