JRC_NSD-51_serv_PE1ABR.pdf

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1、8122 Power Tube Linear Beam Power Tube Coaxial-Electrode Structure Ceramic Metal Seals Full Ratings up to 500 MHz Forced-Air Cooled 380 Watts PEP Output at 30 MHz AB1 570 Watts PEP Output at 30 MHz AB2 300 Watts CW Output at 470 MHz Matched Pair Available BURLE-8122 is a very small, low-cost, forced

2、-air- cooled beam power tube designed for use as an RF poweramplifier,oscillator,regulator,distributed amplifier, or linear RF power amplifier in mobile or fixed equipment. The 8122 features a light-weight, cantilever-supported cylindrical electrode structure within a ceramic-metal envelope. This co

3、nstruction provides a very sturdy tube and permits high-temperature operation. The terminal arrangement of the 8122 facilitates use of the tube with tank circuits of the coaxial or stripline type. Effective isolation of the output circuit from the input circuit is provided at the higher frequencies

4、by the low-inductance ring terminal for grid-No. 2. A base- pin termination for grid-No. 2 is also available for operation of the 8122 at the lower frequencies. The tripod arrangement of both the cathode and the grid-No. 1 leads not only simplifies construction, but enhances electrical characteristi

5、cs. The three cathode leads reduce the inductance path to RF ground and reduce the input admittance at high frequencies. Thisdatasheetgivesapplicationinformation unique to the BURLE 8122. It is to be used in conjunctionwiththepublication,“Application GuideforBURLEPowerTubes,TP-105”,for general appli

6、cation information. Thethreegrid-No.1leadstoseparatepins accommodateasplit-inputcircuitfordistributed amplifier service. The BURLE 8122/V1 is the designation for a matched pair of Type 8122 Beam Power Tubes for use in equipments not having individual bias adjustment. This pair is matched to assure b

7、alanced operation within a bias range of 28 to 40 volts, so that each tube will have an approximately equal anode current during zero- signalandsignaloperation.Suchmatchingalso assures efficient, full system operation and gives optimum life expectancy. General Data Electrical: Heater, for Unipotenti

8、al Cathode: Voltage (AC or DC)113.5 . 10% volts Current at 13.5 volts1.3A Minimum heating time60s Mu-Factor, Grid No. 2 to Grid No. 1 for Anode Volts = 450, Grid-No. 2 Volts = 325, and Anode Amperes =1.212 Direct Interelectrode Capacitances:2 Grid No. to anode.0.15max.pF Grid No. 1 to cathode.16.3pF

9、 Anode to cathode.0.01pF Grid No. 1 to grid No 223.3pF Grid No. 2 to anode.7.0pF Grid No. 2 to cathode.2.7pF Cathode to heater3.3pF Mechanical: Operating Position.Any Maximum Overall Length.2.26” Seated Length.1.920” 0.065” Greatest Diameter1.625” 0.015 Base.Large-Wafer Elevenar 11-Pin with Ring (JE

10、DEC No. E11-81) Socket.JettroncNo. CD77-030, JohnsonaNo. 124-311-100, EriebNo. 9813-000, or equivalent Grid No.2 Bypass Capacitor JohnsonaNo. 124-0113-001, EriebNo. 9812-000, or equivalent Weight (Approx.).3.5 oz Thermal: Terminal Temperature (All terminals).250maxC Radiator Core Temperature (See Di

11、mensional Outline)250maxC Air Flow: See Figure 1 - Typical Cooling Requirements Linear RF Power Amplifier Single-Sideband Suppressed-Carrier Service Peak envelope conditions for a signal having a minimum peak-to-average power ratio of 2 Maximum CCS Ratings, Absolute-Maximum Values: DC Anode Voltage

12、Up to 30 MHz.30004volts Up to 500 MHz2200volts Up to 500 MHz DC Grid-No. 2 Voltage.400volts DC Grid-No. 1 Voltage.-100volts DC Anode Current at Peak Of Envelope.4505mA DC Grid-No. 1 Current.100mA Anode Dissipation.400watts Grid-No. 2 Dissipation.8watts Peak Heater-Cathode Voltage Heater negative wit

13、h respect to cathode.150volts Heater positive with respect to cathode.150volts Maximum Circuit Values: Grid No. 1 Circuit Resistance Under Any Condition:9 With fixed bias.25,000ohms With fixed bias (In Class AB1operation100,000ohms With cathode biasNot recommended Grid-No. 2 Circuit Impedance810,000

14、ohms Anode Circuit ImpedanceSee Notes 4 and 6 Typical CCS Operation at 30 MHz with “Two-Tone Modulation”: AB1AB2 DC Anode Voltage.20002500volts DC Grid-No. 2 Voltage.400400volts DC Grid-No. 1 Voltage.-35-35volts Zero-Signal DC Anode Current100115mA Effective RE Load Resistance.30503500ohms a. E. F.

15、Johnson Co., 299 Johnson Ave., Waseca, MN 56093. b. Erie Specialty Products, 645W. 11th St., Erie, PA 16512. c. Jettron Products, Inc., 56 Route 10, Hanover, NJ 07936 DC Anode Current at Peak of Envelope 335400mA Average DC Anode Current.250275mA DC Grid-No. 2 Current at Peak of Envelope.106mA Avera

16、ge DC Grid-No 2 Current74mA DC Grid-No. 1 Current at Peak of Envelope.0.0573mA Peak-Envelope Driver Power Output (Approx.).0.30.5watt Output-Circuit Efficiency (Approx.).9090% Distortion Products Level: Third order.291028db Fifth order3232db Useful Power Output (Approx.) Average190285watts Peak enve

17、lope380570watts RF Power Amplifier e.g., at 470 MHz heater volts = 12.5 (approx.) 2. Measured with special shield adapter. 3. See TP-105 4. For operation above 2200 anode volts, the tube shall see an effective anode-supply impedance of no less than 750 ohms. A fault current limiting resistor of no l

18、ess than 15 ohms is to be used between the output filter capacitance andthetubeanode.Theanode-supply-output-filter capacitance is to be no greater than 10 microfarads. 5. The maximum rating for a signal having a minimum peak-to-average power ratio less than 2, such as is obtained in “Single-Tone” op

19、eration, is 300 mA. During short periods of circuit adjustment under Single-Tone” conditions, the average anode current may be as high as 450 mA. 6. Thetubeshouldseeaneffectiveanodesupply impedance which limits the peak current through the tube under surge conditions to 15 amperes. 7. This value rep

20、resents the approximate grid-No. 1 current obtained due to initial electron velocities and contact- potential effects when grid-No. 1 is driven to zero volts at maximum signal. 8. A fault current limiting resistor of no less than 320 ohms istobeusedbetweenthescreenoutputfilter capacitance and the tu

21、be screen. The screen supply output filter capacitance is to be no greater than 80 microfarads. 9. A fault current limiting resistor of no less than 20 ohms is tobeusedbetweenthebiassupplyoutputfilter capacitance and the tube grid-No. 1. The bias supply output filter capacitance is to be no greater

22、than 150 microfarads. 10.The value of third order distortion product level shown may be improved by approximately 5dB by utilizing an unbypassed, noninductive 20-ohm resistor between the cathode and ground; a slight increase in drive power will be required. 11.With 13.5 volts ac or dc on heater. 12.

23、With dc plate voltage at 700 volts, dc grid-No. 2 voltage of 250 volts, and dc grid-No. 1 voltage adjusted to give a dc anode current of 185 mA. 13.For conditions with grid-No. 1, grid No. 2, and anode tied together; and pulse voltage source connected between anode and cathode. Pulse duration is 2.5

24、 microseconds and pulse repetition frequency is 60 pps. The voltage- pulse amplitude is 200 volts peak. After 1 minute at this value, the current-pulse amplitude will not be less than the value specified. 14.Under conditions with tube at 20 to 30 C for at least 30 minutes without any voltages applie

25、d to the tube. The minimum resistance between any two electrodes as measured with a 200-volt Meggertype ohmmeter having an internal impedance of 1 .0 megohm, will be no less than the value specified. 15.With dc anode voltage of 450 volts, dc grid-No. 2 voltage of 400 volts, dc grid-No. 1 voltage of

26、-100 volts, grid drive voltage to zero. With pulse duration of 4500 to 5000 microseconds and pulse repetition frequency of 10 to 12 pps. OperatingConsiderationsforType8122/V1- Matched Pair Follow all of the recommendations and instructions outlined by the equipment manufacturers with special emphasi

27、s on the following precautions: 1. Always allow at least three minutes for the tube heaters to warm up before any other voltages are applied or before any current is drawn. 2. During CW tune-up procedure, the total screen current for both tubes should never exceed 15 milliamperes. 3. During CW tune-

28、up procedure the total anode current for both tubes should never exceed 550 milliamperes. 4. In the SSB mode, the total anode current for both tubes should not exceed 400 milliamperes during voice peaks. A sustained tone like a whistle should not be permitted. 5. Check the socket wiring to assure th

29、at each of the three pins provided for the cathode, grid and screen electrodes are interconnected rather than using one pin for each electrode. (See basing diagram of tube bulletin.) 6. Use only 8122/V1 for “matched pair” performance. If an unmatched pair is used in a parallel circuit not having ind

30、ividual bias adjustment for each tube, one tube will carry most of the load current and, consequently, will be operated out of ratings. 7. Never rap a tube or equipment. Each tube of the 8122/V1 set has closely spaced electrodes which control the tubes electrical characteristics. Bumping or rapping

31、the tubes or the equipment may change the spacings, thereby destroying the matched characteristics of the tubes. 8. The operating voltages applied to these devices presents an electrical shock hazard. The tubes and associated apparatus should be housed in a protective enclosure to keep all personnel

32、 from coming in contact with high voltage. The protective enclosure should be designed with interlocks to break the primary circuit of the high- voltage supplies, discharging high-voltage capacitors when any door or gate on the protective housing is opened, and should prevent the closing of the prim

33、ary circuit until the door or gate is again closed. 9. DO NOT use the remaining tube of a matched pair with any other remaining or new tube. The tubes will be unbalanced and will fail prematurely. References 1.Application Guide for BURLE Power Tubes, TP-105. 2.Screen-GridCurrentLoadingandBleeder Con

34、siderations, TP-122 3.Application Guide for Forced Air Cooling of BURLE Power Tubes TP-118 Figure 1 Typical Cooling Requirements Figure 2 - Typical Constant-Current Characteristics For Grid-No. 2 Voltage = 400 Volts Figure 4 -Typical Characteristics - For Grid-No. 2 Voltage = 400 Volts Figure 3 -Typ

35、ical Anode characteristics - For Grid-No. 2 Voltage = 400 Volts Figure 5 - Typical constant-current characteristics For Grid-No. 2 Voltage = 250 Volts Note 1: Keep all stippled regions clear. Do not allow contacts or circuit components to protrude into these annular volumes. Note 2: The diameters of

36、 the radiator, grid-No. 2 terminal contact surface, and pin circle to be concentric within the following values of maximum full indicator reading: Radiator to Grid-No. 2 Terminal Contact Surface0.030” max. Radiator to Pin Circle0.040” max. Grid-No. 2 Terminal Contact Surface to Pin Circle 0.030” max

37、. Note 3: The full indicator reading is the maximum deviation in radial position of a surface when the tube is completely rotated about the center of the reference surface. It is a measure of the total effect of run-out and ellipticity. Figure 6 - Dimensional Outline Pin1: CathodePin 9: Cathode Pin2

38、: Grid-No.2Pin 10: Grid-No.2 Pin3: Grid-No.1Pin 11: Grid-No.1 Pin4: CathodeCap: Anode Terminal Pin5: HeaterRadiator: Anode Terminal Pin6: HeaterRing: Grid-No. 2 Terminal Contact Pin7: Grid-No.2Surface (For use at higher frequen- Pin8: Grid-No.1cies) Figure 8 - Basing Diagram - Bottom View Figure 9 - Gauge Drawing JEDEC No. GE11-1 * This dimension around the periphery of any individual pin may vary within the limits shown. Figure 7 - Base Drawing Large-Wafer Elevenar 11-Pin With Ring JEDEC No. E11-81