april 2007 K2D130W k2 series digital iot k2 uhf-tv cavity ampli?er the eimac K2D130W klystrode ? inductive output tube (iot) is a high ef?ciency ampli?er tube for use in digital uhf television service as the output stage of dtv transmitters. the k2 series is suitable for use with 8vsb, cofdm and similar modulation schemes. the k2 cavity ampli?er, is comprised of a single tube, K2D130W, and associated hardware assembly, ha2000. the cavity ampli?er covers the entire uhf tv band from 470815 mhz (bands iv and v). the k2 ampli?er series has an advanced electro-magnetic- compatibility (emc) designed input circuit, which isolates the rf input from the transmitter dc high voltage. the input ?lter circuit is optimized for the sharp rise-time, short duration pulses of dtv, simplifying transmitter pre-correction. the input circuit has a stable, out-of-the- way storage position and utilizes a cam-guided insertion mechanism to ensure positive connection to the iot. ? designed for 8vsb operation ? peak power capabilities of 130 kw with average power of 31 kw ? high gain ampli?er: 22 db minimum ? long life, high reliability with dispenser type cathode and pyrolytic graphite grid ? single tube and circuit: 470 to 815 mhz ? user-friendly tuning ? tube replacement does not require disconnection of power supply or cooling water ? compact size with collector (water) down ? water-cooled collector and output cavity. air-cooled electron gun and anode. ? made in the usa - iso 9001 facility electron gun and cavity air-cooling is improved with the new k2 air plenum design. tube replacement and maintenance is a simple matter for one person without requiring hoists or removing the cavity assembly from the transmitter cabinet. coolant lines or power supplies do not have to be disconnected. in dtv digital transmission, the K2D130W klystrode ? iot can be used at up to 130 kw peak power with average power levels of 30 kw for 8 vsb operation (for details please contact eimac division, cpi inc., klystrode ? iot applications engineering). the input cavity, the output cavity, focus magnet assembly, arc detector, water-jacket and load coupler are mounted on a rugged wheeled support stand which is compatible with transmitters from all manufacturers. made in usa
for more detailed information: contact cpi mpp / eimac operation, iot applications engineering 607 hansen way, palo alto, ca 94304 phone: 650-592-1221, fax: 650-592-9988 www.cpii.com or e-mail to: klystrode@cpii.com characteristics and typical operating conditions are subject to change without notice. cpi, eimac division should be consulted before using this information for ? nal equipment design. klystrode ? and eimac ? are registered trademarks of cpi. vacion ? is a registered trademark of varian associates, inc. summary data frequency range ................................................. 470 to 815 mhz power gain ........................... 22 db typical at average power levels beam voltage ........................................................... 27 to 38 kv* electrical cathode .................................................................. dispenser type dc heater voltage ...................................................... -8 to -10 v dc heater current ................................................ 8.5 a (typical) dc heater power ................................................. 80 w (nominal) maximum cold start dc heater current ............................. 15a* heater warm-up time ..................................... 5 minutes (nominal) focus magnet (current regulated): dc voltage .......................................................... 3.5 1.5v dc current .......................................................... 1525a mechanical K2D130W klystrode iot length .................................. (overall) 22.5 in ( 57.2 cm) nominal diameter ................................. (overall) 5.1 in (12.9 cm) nominal mounting position ............................. vertical, collector end down net weight (with lift handle) ................ 25.0 lbs ( 11.4 kg) approx. ha2000 hardware assembly input ........................................ ....... rf connector, 7/16 type n output rf connector: standard 3-1/8 inch, 50 ohm coaxial line (alternate 4-1/16 inch, 50 ohm coaxial line available - user to specify). net weight of total hardware assembly ................ 460 lbs [209 kg] * current must be limited by the supply operational characteristics dtv service (8vsb): peak output power ........................................................... 130 kw average output power ......................................................... 30 kw vswr ................................................................................ 1.1 : 1 beam voltage ...................................................................... 36 kv beam current (avg) .............................................................. 2.3 a grid current (max) ............................................................ 0.2 a bias voltage (typical) ............................................................ -73 v beam idle current .................................................................. 0.5 a peak input power .............................................................. 1000 w average input power ........................................................... 240 w collector dissipation (max) ............................................... 60 kw cooling 1 air?ow to cavities and cathode ............... 50 - 70 cfm (2.0 m 3 /min) static pressure head ............................. 5.0 inches water (1.30 kpa) inlet air temperature ..................................................... 1550c water ?ow for collector ............. 10C20 us g/min (38 -75 1/min) collector pressure drop at 15 us gal/min ............. 15 psi (104 kpa) maximum inlet pressure ...................................... 60 psi (414 kpa) water outlet temperature .............................................. 70cmax water inlet temperature .............................................. 15?55c arc detector two (2) photo resistors and test lamps are located in the output cavities which must be used for protection of the tube from cavity arc damage. ion pump a getter ion pump requiring 3-4 kv with respect to the heater is provided. note 1: the recommended coolant ?ow rate for pure demineralized water is 10 gpm. when using a 50/50 glycol/water mix, eimac recommends the ?ow rate be set at 20 gpm. regardless of the coolant mixture, should audible evidence of boiling be heard, which sounds like rattling, the coolant ?ow rate must be immediately increased or the equipment shut down. annual replacement of the coolant, such as dowtherm 4000 or dowtherm sr-1, is recommended to avoid glycol breakdown.
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