NL347 40W267 - Datasheet Archive

 

Air Cooled UHF Power Tetrode The NL347 is a metal-ceramic, forced-air cooled, coaxial power tetrode. The tube features high gain

 

NL347 NL347 Air Cooled UHF Power Tetrode The NL347 NL347 is a metal-ceramic, forced-air cooled, coaxial power tetrode. The tube features high gain and high linearity and is primarily intended for use as a linear broadband amplifier in band IV/V TV transmitters and transposers. · Output power: 1.1 kW peak-of-sync in common amplification of the vision and sound carriers. 1.2kW in sound-carrier amplification. · Operating frequency up to 1000 MHz. · Excellent linearity · Anode dissipation up to 4.5 kW, with forced-air cooling. · Typical gain: 15.5 dB Quick Reference Data Electrical Type of Cathode Thoriated Tungsten Heating Direct, dc or single phase Heater voltage 6.0+ 2% Heating current, approx. 34 Heating surge current max. 85 Amplification factor, G1-G2, average 7 Transconductance Ia=1.5A, Vg2=400V 40 Mechanical Operating position Weight, approx Dimensions Vertical 2.3 see outline drawing Anode Cooling Type Minimum air flow on the anode Corresponding pressure drop Maximum air inlet temperature Maximum air outlet temperature Forced Air 2 2 50 100 V A A mA/V kG m3/minNote 1 mbar °C o C For direction of air flow see outline drawing. The air should be ducted so that sufficient air is directed to the seals to keep the seal temperature below the limit. 40W267 40W267 Keslinger Road LaFox, IL 60147 USA (630) 208-2200 Amperex NL347 NL347 Capacitances, grounded-grid Input Output Anode to filament Cin Cout Caf 40 8.2 0.1 Tenv Tenv Ts 250 200 180 pF pF pF Temperature Limits Absolute maximum envelope temperature Recommended envelope temperature Recommended seal temperature o C C o C o R.F. Class-AB Amplifier for Television Transposer Service Limiting Values Unless otherwise stated, the voltages are given with respect to the cathode. Frequency f up to 1000 Anode voltage Va max. 5 Grid 2 voltage Vg2 max. 650 Grid 1 voltage -Vg1 max. 200 Anode current Ia max. 2 Anode dissipation Wa max. 4.5 Grid 2 dissipation Wg2 max. 25 Grid 1 dissipation Wg1 max. 5 Peak cathode current Ikp max. 6 MHz kV V V A kW W W A Operating Conditions Negative modulation, positive synchronization, combined sound and vision. (CCIR standard G) Frequency of vision carrier f 470 to 860 Bandwidth (-1dB) B 10 8 Anode voltage Va 4 4 Grid 2 voltage Vg2 400 400 Grid 1 voltage Vg1 50 50 Anode current, zero signal Ia0 0.5 0.5 Anode current (black + sound) Ia 0.8 0.75 G2 current (black + sound) Ig2 7 7 Output power in load, sync. Wl (sync) 1100 1100 Power gain G 15.5 16 Intermodulation products d -54 -54 MHz MHzNote 2 kV V VNote3 A A mA W dB dBNote4 Notes: 1. 2. 3. 4. Page 2 For an air inlet temperature of 30oC, an anode dissipation of 2 kW and at sea level. With double-tuned circuit. To be adjusted for the stated zero signal anode current. Three-tone test method (vision carrier -8 dB, sound carrier -10 dB, sideband signal -16 dB with respect to peak sync = 0 dB) Amperex Amperex Figure 1: Constant Current Characteristics Vg2 = 400 V Figure 2: Constant Current Characteristics Vg2 = 600 V Page 3 Amperex NL347 NL347 Figure 3: Mechanical Outline Dimensions in mm NOTES: 1. Cylindrical area for connection 2. R 2.5 max 3. Tolerance on diameters + 0.3 unless specified otherwise 4. Maximum excentricity: 0.3 5. Reference plane Characteristics and operating values are based upon performance tests. These figures may change without notice as the result of additional data or product refinement. Richardson Electronics, Ltd. should be consulted before using this information for final equipment design. Page 4 Printed in U.S.A. 6/93