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| DATA S H E E T MICROWAVE POWER MODULE FOR GROUND TERMINALS LD79U04K 14 GHz, 40 W CW, LIGHT WEIGHT, COMPACT, EFFICIENT GENERAL DESCRIPTION NEC Microwave Power Module (MPM) LD79U04K is a microwave power device in which a traveling wave tube (TWT) and an electric power conditioner (EPC) are combined, so that both components can accomplish each full performance. LD79U04K delivers an output power of 40 W over the range of 13.75 to 14.5 GHz with a gain of 25 dB. The TWT in the LD79U04K has been designed and developed upon the NEC's advanced technology and enormous experience on a number of TWTs used in satellite ground terminals and terrestrial microwave links. The very small and light weight EPC designed with sophisticated and experienced circuit technology ensures higher reliability, reduced maintenance costs and improved technical performance. The LD79U04K is most suitable for a power amplifier in digital communication systems. A configuration of separated TWT and EPC can offer superior flexibility of design for high power section of transmitters. FEATURES TM Light weight, Compact, and Efficient The TWT has a dual-depressed collector and is designed to operate at high efficiency across the power output range. The EPC features state-of-the-art techniques to optimize size and efficiency and the combination results in a unit significantly smaller and with less power consumption than a comparable solid state amplifier. TM Low Distortion NEC has developed techniques for the correction of non-linear distortion of gain and phase generated in a TWT. As a result, the MPM has optimum performance across a broad power range and is ideally suited for multicarrier transmission systems. TM Long Life The TWT in NEC's MPM is designed to have a lifetime of 100,000 hours or more, which is comparable to that of a solid state amplifier in actual usage. TM Ideal for Digital Systems A mini-arcing in the electron gun have been eliminated in the TWT used in the MPM. For safe use of microwave tubes, refer to NEC document "Safety instructions to all personnel handling electron tubes" (ET0048EJVUM00) The information in this document is subject to change without notice. Document No. ET0225EJ2V0DS00 Date Published September 1998 M Printed in Japan (c) 1996 LD79U04K TYPICAL OPERATIONS Frequency Range ................................................ 13.75 -14.5 GHz Power Output ................................................... 40 W minimum Instantaneous Bandwidth .................................... 750 MHz Gain Variation ................................................... 2.0 dB / 750 MHz Gain ............................................................... 25 dB (at Po = 40 W) 35 dB (at small signal) Gain Stability ................................................... 0.25 dB / 24 h (25C 10C) Gain Slope ......................................................... 0.02 dB / MHz Harmonic Output ................................................ 15 dB below at rated output power Spurious Output ................................................ -90 dBW in any 4 kHz band in the 13.75 to 14.5 GHz AM to PM Conversion ....................................... 4.5/ dB at rated power (total 8 W) Group Delay Linear component .......................................... 0.1 ns / MHz Parabolic component ....................................... 0.01 ns / MHz2 Ripple component .......................................... 1.0 ns (p-p) in any 40 MHz band RF Input Connector ...................................................... Mates with Type SMA Female VSWR ............................................................ 2.0 : 1 maximum Load VSWR ................................................... Operate into 1.5 : 1 maximum RF Output Connector ...................................................... Mates with Type SMA Female VSWR ............................................................ 2.0 : 1 maximum Load VSWR ................................................... Operate into 1.5 : 1 maximum Primary Power ................................................... -48 V 10% Power Consumption .......................................... 163 W Electrical Connection .......................................... DA-9-N D-Sub Connector Dimensions TWT ............................................................ 178 x 33 x 25 mm EPC ............................................................... 220 x 140 x 47 mm Weight ............................................................... 2.5 kg (both TWT and EPC) Intermodulation ................................................ 28 dB below each of two equal carriers ENVIRONMENTAL CONDITIONS TM Ambient Temperature -15C to +50C (operating) -30C to +70C (non operating, storage) TM Relative Humidity 90% maximum (non dewing) TM Base Plate Temperature of the TWT +90C maximum 2 LD79U04K Note 1 : Absolute rating should not be exceeded under continuous or transient conditions. A single absolute rating may be the limitation and simultaneous operation at more than one absolute rating may not be possible. Note 2 : These characteristics and operating values may be changed as a result of additional information or product improvement. NEC should be consulted before using this information for equipment design. This data sheet should not be referred to a contractual specification. 3 LD79U04K LD79U04K OUTLINE (Unit in mm) 240 33.07 23.8 6 - 4.5 Thru 25 17 4 80 3-#8 flat head screw 3.2 +0.2 Thru - 0.15 80 40 47 61 RF Output 85 RF OUT 57.7 RF Input 178 RF IN 85 10 3.2 +0.2 Thru - 0.15 300 5 115 150 300 9. Helix current ALM 10. Helix current ALM COM 9 1 1. DC IN -48V 2. DC IN -48V 3. N / C 4. DC IN GND 5. DC IN GND 6. N / C 7. HV ON RESP. 8. HV ON RESP. COM 11. Helix current MON. 12. Helix current ALM MON. COM 13. HV ON / OFF 14. HV ON / OFF 15. N / C 15 8 NEC Cor poration Pin Connection (D-sub. 15 pins) (Note 1-5) Note 1. DC IN -48 V : No.1 and NO.2 are Connecting DC IN GROUND : No.4 and NO.5 are Connecting 2. HV ON/OFF RESPONSE SIGNAL : Photocoupler Interface (No.7: Collector, No.8: Emitter) HV ON : No.7 and No.8 conduct 3. Ihel ALM Signal : Photocoupler Interface (No.9: Collector, No.10: Emitter) Ihel ALM Signal ON : No.9 and No.10 conduct 4. Ihel Monitor (No.11, No.12) : 1 V/mA 5. HV ON : When No.13 and No.14 conduct, TWT will be ready to amplify NEC Corporation does not assume any liability for infringement of patents, copyrights or other intellectual property rights of third parties by or arising from use of a device described herein or any other liability arising from use of such device. No license, either express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of NEC Corporation or others. Printed on recycled paper WARNING HAZARDOUS VOLTAGE 5 M2.6 (ISO) MADE IN JAPAN |
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