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milstar: 8923H TWT �� Frequency: 30–31 / 33–36 / 43.5–45.5 GHz �� Psat (min.): 300 W / 380 W / 175 W �� DC in (max): 780 W / TBD / 550 W �� Dissipation (max): 480 W / TBD / 380 W �� Size: 2.8” x 2.3” x 12.0” �� Weight: < 4 lbs ############### Note: Different voltages required for Ka and Q band operation http://www.l-3com.com/eti/downloads/military/8923H.pdf Military and Telecommunications Products High Power MMW Helix TWT Product Listing http://www.l-3com.com/eti/product_lines_military_twt.htm
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milstar: В частности, представлена первая российская бортовая лампа бегущей волны (ЛБВ) с охлаждением за счёт инфракрасного излучения в открытое космическое пространство. Изделие показано в рамках Международного авиационно-космического салона МАКС-2019 в подмосковном Жуковском. Новинка получила обозначение «УВ-А2014». Она спроектирована специалистами НПП «Алмаз» (входит в «Росэлектронику»). Утверждается, что лампа позволяет снизить тепловую нагрузку на систему обеспечения терморегуляции космического аппарата более чем в два раза. А это увеличивает стабильность работы спутника в режимах приёма-передачи информации. Изделие «УВ-А2014» может применяться в гражданских спутниках и в специальных космических аппаратах связи. Рабочий диапазон частот — Ка. Выходная мощность достигает 130 Вт, коэффициент усиления — 50 дБ. «В настоящее время в космических аппаратах используются приборы зарубежного производства. Наша разработка позволит отказаться от импортных ЛБВ, что существенно сократит затраты на комплектующие для космических аппаратов, уменьшит зависимость от импортных поставок и повысит технологическую безопасность страны», — заявляют разработчики. https://3dnews.ru/993313
milstar: New Generation Mini-TWTs Design modeling of key areas of the TWT, coupled with rapid prototyping has seen a new family of mini-TWT tubes evolve, using the standard mini-TWT as the host design vehicle. The result is three new mini-TWT ranges: • The N20173 6 to 18 GHz TWT range, achieving a minimum 100 W • The N20160 4.5 to 18 GHz TWT range, 140 W typical • The N20154 13.75 to 14.5 GHz (Ku-band) TWT range, achieving a minimum 120 W The N20173 Current standard mini-TWTs typically operate over this 6 to 18 GHz bandwidth, but fall short of output power in the upper frequency range. The design driver for the N20173 (shown in Figure 1) was to increase the efficiency of the new device at higher frequencies without degrading performance at the lower end of the operating band. This was achieved by the use of a Slow Wave Structure (SWS) with a novel phase velocity taper. Consequently, the new N20173 tube achieves >100 W over the full operating frequency band and the new RF structure reduces the second-harmonic output to < –9 dBc at 6 GHz. Figure 2 shows the power to frequency performance of the N20173 compared to e2v’s standard mini-TWT. Also, an optimized coaxial TNC output achieves better than 2.2:1 VSWR and variants within the range include two- and three-stage collectors and a focus electrode switched option for pulsed or CW operation. The N20173 maintains the compact design of the standard e2v mini-TWT, being 220 mm long, 27 mm wide and 29 mm high, with a mass of less than 320 g. It can operate at base plate temperatures up to 140°C and altitudes up to 70,000 ft, under severe shock and vibration levels. The N20160 There has recently been increasing demand for higher-powered mini-TWTs capable of operation over the extended 4.5 to 18 GHz bandwidth. Thus, the N20160 device (shown in Figure 3) has been designed as a drop-in replacement for the standard mini-TWT, capable of operation at the same voltages and maintaining the same space envelope. The increased performance has been achieved through a combination of efficiency enhancement, the utilization of velocity tapers in the slow wave structure and increased beam current. The N20160 device also offers a minimum of 140 W between 6 and 13 GHz, more than 100 W at 18 GHz and more than 50 W at 4.5 GHz. The maximum RF drive required for saturation is 22 dBm, and the small-signal gain achieved mid-band is 59 dB. With optimization of the slow wave structure it has been possible to enhance the second-harmonic performance, which is a dominant characteristic of multi-octave devices. The device typically achieves second-harmonic levels of 1 dBc at 4.5 GHz and –10 dBc at 6 GHz. Figure 4 shows the power versus frequency performance of the N20160 compared to e2v’s standard mini-TWT Pre-production N20160 models have been tested using both dual- and three-stage collectors, achieving prime powers of less than 460 W. This increased performance has been achieved while maintaining compact size and weight—220 mm long, 27 mm wide and 29 mm high, with a mass of 320 g. The N20154 The N20154 mini-TWT (shown in Figure 5) has been developed to satisfy the ever-increasing demand for low-cost, lightweight, high-efficiency, compact TWTs for communication and data link applications. The mini-TWT’s design moves away from broadband convention and is optimized specifically for operation over the narrow communications band. This gives the advantage over broadband devices of improved linearity and gain flatness.. https://www.microwavejournal.com/articles/6178-new-generation-travelling-wave-tubes
milstar: Summary form only given, as follows. For future military radar applications high frequency, light weight TWTs become more and more important. To cover this market, TTE (Thomson Tubes Electroniques) started the development of a 94 GHz TWT. The goal of this program was a TWT (double comb delay line structure) in the 94 GHz frequency range with an instantaneous bandwidth greater 500 MHz (tunable within 1 GHz) and an output peak power greater 200 W in the center of the band (150 W over the band) for a duty cycle of max. 10%. In a second mode (different operating point) the goal for the output power was more than 100 W peak over the band and a duty cycle of max. 20%. Further parameters were the delay line voltage below 22 kV, a grid voltage swing of max. 400 V and mass smaller 1300 grams. The technical base of this program was TTE's experience in development and production of TWTs in the 30, 35 and 60 GHz frequency range. From there we started with the modification and adaptation of the standard technologies and TWT design, to be applicable for the special requirements in the 94 GHz range, concerning the small mechanical dimensions and allowed tolerances. The basic design and main test results of the 94 GHz TWT are the content of this paper. https://ieeexplore.ieee.org/abstract/document/847401
milstar: https://almaz-rpe.ru/products/ Широкополосные ЛБВ УВ-А3002 УВ-А3004 УВ-А3018 УВ-А3018М УВ-А3024 УВ-А3025 УВ-А3026 УВ-395 УВ-518 УВ-520 УВ-532А, Б УВ-533А
milstar: https://almaz-rpe.ru/products/bortovye-lbv/uv-704/ В настоящее время предприятие выпускает приборы в C, X, Ku, и Ka диапазонах. Данные ЛБВ обладают высокой надёжностью — долговечность до 150 тыс. ч., гарантийный срок эксплуатации 25 лет, что соответствует уровню лучших мировых образцов. За более чем шестидесятилетнюю историю своего существования предприятием было разработано 160 типов ЛБВ непрерывного действия и 60 типов импульсных ЛБВ, что составляет примерно 50% всех ЛБВ, разработанных в СССР и России. https://almaz-rpe.ru/about/subunit/elektronnye-sistemy/
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