ECA TEP 138-1962 Noise Figure Testing of RF Amplifier Tubes (TEP 38)《RF扬声器的噪声指数测试》.pdf

1、,r 1 d I YB =I I -I EIA TEP138 b2 323qbOO 00083b9 O DECEMBER 1962 (Reafflrnod Juni, l2) TEPAC PUBLICATION NO. 138 NOISE FIGURE TESTING OF RF AMPLIFIER TUBES FORMULATED BY EIA TOBE ENGINEERING PANEL ADVISORY COUNCIL EIA PUBLICATION NO. 138 EIA TEP138 b2 m 3234600 0008370 7 m NOTICE. . B EIA Engineeri

2、ng Standards and Publications are designed to serve the public interest through eliminating misunderstandings between. manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting thg purchaser in selecting and obtaining with minimum delay the proper produ

3、ct for his particular need. Existence of such Standards and Pub- . lications shall not in any respect preclude any member or non-member of EIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standards and Publications preclude

4、 their voluntary use by those other than EIA members, whether the standard is to be used either domestically or internationally. Recommended Standards and Publications are adopted by EIA without regard to whether or not their adoption may involve patents on articles, materials? or processes. By such

5、 action, EIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Recom- mended Standard or Publication. Published by ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department 2001 Eye Street, N.W. Washington, D.C. 20006 , . a. PRICE: $

6、3.00 I Printed in U.S.A. EIA TEP338 b2 9 3234600 0008373 9 NOISE FIGURE TESTING OF RFAMPLIFIER TUBE3 I This publication describes in considerable detail a mekhod for measuring noise figure of RF amplifier tubes in the receiving tube class. This method is intended for use in obtaining noise figure va

7、lues for inclusion on JEDEC data sheets. -1- I- EIA TEP138 62 3234600 O008372 O NOISE FIGURE TESTING OF RF AMPLIFIER IVBES . . . - _-_ . . 1.0 EQUIPMENT SPECIFTCATIONS 1.1 Basically the equipment for making noise figure measurements of RF ampllfler tubes consists of a noise sou%, test Jig in which t

8、he tube under test c be operated under the specified conditions of voltage and circuitry, post aaapll- fier, and noise figure meter. Block diagrams showing Set-up for neutralization (Figure IA), gain and ban- width check (Figure lB), and noise figure (Figure 1C) are shown on page 5. 1.1.1 Noise Sour

9、ce - Hewlett-Paqkard No. 343A or equivalent. 1.1.2 %be-Under-Test Jig - Circuit specificatione: i) 200 megacycles center frequency. 2) 3 db bandwidth of 10 f 2 megacycles. 3) Pi input circuit adjustable to noise matched conditions. 4) Pi output circuit tunable to 50 ohms output. mwdance; 5) Single P

10、 requency neutralization for triodes, including the grounded cathode section of cascode tubes. 1.1.3 Post Amplifier - The general specifications for the post amplifier are as f ollows : i) Soo-megacycle center frequency at input. 2) Maximum bandwidth of 5 megacycles at 3 db points. 3) Sufficient gai

11、n in conJunction with the noise figure meter to read the noise figure of the unit itself. 4) Maximum noise figure of 6 db. 5) !j-ohm input constant over the pass band. 6) 5O-Ohin Output. THe post smplifier can assume several configurations. fier, modified if necessary ta provide an undetected output

12、, can be used. Frequency conversion to an IF frequency can be used. ard VHF tuner with its input modified to 50 ohma unbalanced can be coupled to a standard locations a screen room will be required. In 2.4.4 . Trimmer, tubular ceramic, 1-4 wf. Air trimmer, approximately 1.8-8.7 wf (9 plates), with s

13、haft. Air trimmer, approximately 2.9-19 ppf (21 plates), with shaft. Tubular ceramic, 10 ppf “PO. Feedthrough capacitor, solder in type, 1,OOO ppf. -1 or equivalent) . (Centralab Stand-off capacitor, 0.001 pf. Coil - 5 turns No. 20 enemel magnet wire close wound on a slug tuned form (Grayburne G-3 o

14、r equivalent). Coil - 2 turns No. 20 magnet wire space wound, 3/8“ long. Coil - 5 turns No. 20 magnet wlre space wound, 3/8“ long. Coil - 3 turns No, 20 magnet wire space wounii, 3/8l* long. Coil - 4 turns No. 20 magnet vire space wound, 3/8 long, FU? choke (Ohmite 2-235 or equivalent). Control knob

15、s to fit shaft of condensers, C3 and C4. EIA TEP138 62 M 3234600 O008380 T M I a I n i -1 PROBLEM HARD CaPYLI EIA TEP338 62 W 3234600 0008383 I W “1 I I 1 I I 1 I I 1 I I I 1 I I I I I I U F t! .T f IE! I 6 x K bt II EIA TEP138 b2 m 3234600 0008382 3 m PROBLEM HARO - COPY - EIA TEPL38 b2 = 3234b00 0

16、008383 5 rr i PROBLEM HARD CnPY - EIA TEPL38 62 m 3234600 0008384 7 m APPENDIX A FIFTH DRCLFT - NOT APPROVED JEDEC DATA JOINT ELECTRON TUBE ENGINEERING COUNCIL COMMITTEE ON RECEIVING TUBES Page 1 JEDEC TYPE 6BQ7A TIJIN TRIODE The Ty-pe 6BQ7A is a gain control, twin triode RF amplifier intended for V

17、HF cascode circuit applications. MECHANICAL DATA Coated unipotential cathode Outline drawng . Bulb . Base . Kaximumdiameter . rulaximum over-all length Maximum seated height . Pin connections Pin 1 - No. 2 Plate Pin 2 - No. 2 ,Grid Pin 3 - No. 2 Cathode Pin 4 - Heater Pin 5 - Heater 6-2 . Eg-lminiat

18、ure button T6i/2 . . BasinggAJ Pin 6 - No. 1 Plate Pin 7 - No. 1 Grid Pin 8 - No. 1 Cathode . Pin 9 - Internal Shield Mounting Position any EIIFXPRICAL DATA * Heater Characteristics and Ratings (Design-&ximum Rating System) * Voltage ac or dc) 6.3 f 0.6 volte Wirmim heater-cathode voltage: 9 Heater

19、negative with respect to cathode: Totaldc and peak . . 200 volts Heater positive with respect to cathode: dc . . . 100 volte Current I at heater . 6.3 volts) . 0.400 amp Total dC and peak 200 Volts $6 Mrect Interelectrode Capacitances No. 1 Triode No. 2 Triode Grid to plate: (g to p) 1.2 Plate to ca

20、thode: (p to k) . 0.12 Heater to cathode: (h to k) . 2.8 No. 1 Input: g to h + k + i.6. 2.6 / No. 2 input: k to h + g + ias. . I i I I NO. loutput: pto h + k + 1.s. 1.3 / No. 2 output: p to h + g + 1.s. . . NO. 1 plate to No. 2 plate: No. 2 plate to No. 1 plate and grid: (lp to 2p) maximum . (2p to

21、lp + Ig) IIIEZX. 1.2 pf 0.12 pf 2.8 pf Pf 5.0 f Pf 2.4 pf 0.020 0.040 EIA TEP138 bi! 323qbOO 0008385 9 Page 2 * Ratings (each unit) (Design-Wxixaum Ratiq System 0 Maximum plate voltage . . . 250 volts Naximum p1at.e dissipation . Maximum cathode current . 22 ma Maximum grid circuit resistance 2.2 wa

22、tts 0.5 megohm Average Characteristics (each unit) Plate voltage . . 150 volts Cathode resistor . 220 ohms APlate resistance 5,600 ohms A Transconductance 6,800 os Ahplification factor . 38 Plate current. . 9- -6.0 volts Grid voltage (approximate) for ep1 = 100 -os Average Cascode RF Amplifier Chara

23、cteristics Plate supply voltage . Grid voltage - input section . M Noise figure (noise matched, fo = 200 Mc . 250 volts -1.0 volt Plate current . 14.0 ma ATransconductance . 8,800 pmhos 5.6 db Grid voltage - input section (approximate) for gm = 100 omnos . -9.3 volts Equivalent DC Test Circuit - c 4

24、70 K +250 v -1.0 v * &is-maximum ratings are limiting values of operating and environmental conditions applicable to a bogey electron tube of a specified type as defined by its published data and should not be exceeded under the worst probable conditions. .The tube manufacturer chooses these values

25、to provide acceptable serviceability of the tube making allowance for the effects of changes in operating conditions due to variations in the characteristics of the tube under consideration. The equipment manufacturer should design so that initially and throughout life no design-maximum value for th

26、e intended service is exceeded with a bogey tube under the worst probable operating conditions with respect to supply-voltage variation, equlpxuent component variation, equipment control adjustment, load variation, Sig- nal variation, environmental conditions, and variations in the characteristics o

27、f all other electron devices in the equipment, EIA TEP138 62 m 3234600 0008386 0 m a page 3 iw The equipment designer shall so design the equipment that the heater voltage is centered at the specified bogey value. to mintain heater voltage within the specified tolerance, Heater supply variations sha

28、l be restricted $ This rating may be as high as 300 volts under cutoff conditions, when the tube is used as a cascode amplifier and the two sections are connected in serie. $ External Shield No. 315 connected to Pin 9. / Read as grounded grid amplifier* A Resistors are to be adequately bypassed, M The noise figure is measured in acconlance with the procedure outlined in JEDEC Publication No. , NOISE FIGURE TESTING OF RF AMPLIFIER TUBES.