1、I 0b 2111784 2b3 Parameter: Unit: Value: I INCH-POUND I MIL-PRF-l/1394C(USAF) 26 Julv 1999 SUPERSEDING 7 January 1977 MIL-E-l/1394B(USAF) If Ib A mA dc O 200 PERFORMANCE SPECIFICATION SHEET ELECTRON TUBE, NOISE SOURCE TYPE 6357 This specification is approved for use by the Department of the Air Forc
2、e and is available for use by all Departments 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: X-band, gaseous discharge diode. ABSOLUTE RATINGS: Tbulb ,:dC 1 :
3、oc Maximum: 170 +85 +125 Minimum: - -54 _- PHYSICAL CHARACTERISTICS: Cathode: Filamentary type Dimensions: See outline drawing Base: See outline drawing Mounting position: Any TEST CONDITIONS: GENERAL: Preproduction test: Required (see N/). AMSC NIA 1 Of5 DISTRIBUTION STATEMENT A. Approved for publi
4、c release; distribution is unlimited. FSC 5960 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-L/1394C m 9979906 2111785 LTT Symbol Ef Etd NR-1 VSWR VSWR Inspection Conformance insDection. Dart 1 Filament voltage Voltage drop Excess noise Mat
5、ch (1) Match (2) Li Min _-_ 70 15.40 - _ Conformance inmection. Dart 2 Variable frequency vibration Conformance insDection. Dart 3 Intermittent life test Life test end point: Excess noise ratio 1031 MI L-PRF-1 Il 394C( USAF) TABLE I. Testina and insDection. Conditions If=170mAdc - 2/ - 11 21 31 51 I
6、b=O 4/ a F = 9.0 10.3 percent GHz F = 9.0 t 0.3 percent GHz F = 9.0 f 0.3 percent GHz Ib = 250 mA dc 31 61 No voltages 91 Group D; cycle one minute on, 2 minutes off; preheat time 2 to 3seconds 31 a F = 9.0 t 0.3 percent GHz I/ 31 91 51 tS Max 20 80 15.80 1.1:l 1.1:l -_ 15.85 Unit V dc V dc db - _-
7、Cycles db II The excess noise ratio (Nr-1) is defined in db as - 2 In the test circuit of figure 4 with a filament current of 170 mA dc, the tube shall operate within three tries. 31 The tube shall be tested in total darkness. The tube shall be tested in a tube mount as specified in figure 3, or equ
8、ivalent, terminated by a matching RG-5ZU termination having a VSWR no greater than 1.01:l such as a Hewlett-Packard X-914A, or equal. Excess noise ratio measurements tests shall be made using the circuit of the block diagram of figure 2. Excess noise ratio should be measured by comparison with an ap
9、proved standard noise source. - 5/ The frequency specified is that of the local oscillator. The frequency specified is that of a signal generator. 71 Excess noise ratio shall be measured by comparison with an approved standard. - 81 The tube shall be tested at an ambient temperature of +85“C (185F).
10、 $1 Intermittent life test end points shall apply. - 10/ First article sample inspection shall conform to the requirements of appendix F of MIL-PRF-1 and shall consist of performing ali tests specified on this specification sheet. In addition, first article sample approval shall include satisfactory
11、 demonstration of tube-to-system compatibility. Invitation for bids should provide that the preparing activity reserves right to waive the requirements for first article samples as to those bidders offering a product which has been previously acquired or tested by the Government, and that bidders of
12、fering such products who wish to rely on such production or test, must furnish evidence with the bid that prior Government approval is presently appropriate for the pending acquisition. - 11/ Unless otherwise specified, the acceptance level for all tests listed under conformance inspection, part 1,
13、shall be 1 .O percent, inspection level II. (Te - 1) where Te is the effective electron temperature. Nr - 1 = 10 log - - 290 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-l/1394C( USAF) NOTES: 1. Miniature bi-pin base. 2. ,380 inch (9.65
14、mm) maximum, no minimum 3. Brass contact. 4. Dimensions shown in inches. dimension on diameter for this length of tube. FIGURE 1. Outline drawina for electron tube tvDe 635 7. FIGURE 2. Test circuit for excess noise measurements. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted
15、 without license from IHS-,-,-MIL-PRF-L/L394C 0b 2LLL787 T72 I- AS REQUIRED “i 0010.161I.D. FiGURE3. p. L R2 SYMBOL DESIGNATION E = 115 V oc Cl = 8,uF C2 = 40,uF C3 = .006F R1 = 5a R2 = 800sl R3 = 100Osl L = 2 HY 250 MA SR = SELENIUM SW = (MOMENTARY 1 - E RECTIFIER NORMALLY OPEN FIGURE 4. Stariina a
16、nd ooeratina circuit. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Custodians: Air Force - 11 DIA - CC Review activities: Air Force - 99 MIL-PRF-L/1394C b 2333788 909 Preparing activity: DLA - CC (Project 5960-3549) 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
