Commander ii 2 meter vhf linear amplifier ————————————————————— owner’s manual palstar, inc. Command technologies division 9676 n. Looney road piqua, ohio 45356 u.S.A. Customer service and sales telephone: 800-773-7931 fax: 937-773-8003 e-mail: info@palstar.Com.
2 table of contents introduction 3 inside view 4 specifications 5 unpacking instructions 6 hv transformer installation 6-8 safety warnings and precautions 9 front & rear layout 10 installation preparation 11 operating procedure 12 operating hints 13 typical operating conditions table 13 warranty, se...
3 introduction the commander ii is a grounded grid class ab2 linear power amplifier that operates on the amateur 2 meter band (144 to 148 mhz). A single cpi/eimac 3cpx800a7 pulse-rated external anode triode with forced air cooling and modern stripline circuitry ensures efficient and conservative ope...
4 high voltage transformer t/r relay board cooling blower load tuning capacitor input tuning piston capacitor multimeter switch 3cpx800a7 triode tube filament transformer high voltage interlock switch control board multimeter high voltage board (underneath) commander ii inside layout.
5 specifications commander ii 2 meter vhf linear power amplifier • frequency range: 144 to 148 mhz. • modes: usb, lsb, rtty, fm, cw. • power requirements: 117/200/234vac 50/60 hz. • rf drive power: 10 to 15 watts nominal; 30 watts maximum, for full 1 kw (cw) output. • rf output: +15db gain; > 650 wa...
6 unpacking instructions carefully remove your commander ii from its shipping carton making sure there is no dam- age evident from shipping. If there is any damage, notify the delivering shipper immediately, fully describing the damage. Do not destroy the packing material, since it may be reusable l...
7 lift the hv transformer and tilt it as shown in the picture. Gently lower the transformer until the side with the connector is resting on the amplifier chassis. Make sure that none of the wir- ing is pinched under the trans- former. While supporting the raised side of the transformer, gently lower...
8 be sure to read the safety cautions on the next page before operating! Plug the connector on the trans- former into the one on the wiring harness. It is keyed so that it cannot be plugged in backwards. Make sure that the connector halves are pressed together until the lock tabs snap in place. Dres...
9 cautions: • do not attempt any type of service or repair on this amplifier without first removing the ac power and allowing at least 60 minutes for the high voltage capaci- tors to bleed off ! • do not operate this amplifier with the top or bottom covers removed. Do not operate this amplifier with...
10 ground lug multimeter tune control multi-turn piston capacitor preset at factory— do not adjust, see pages 12 & 13 multimeter selector switch load control input control standby/ operate switch on/off switch power ready light voltage selection jumper cover rf in rf out operate enable connector rea...
11 installation preparation the commander ii is factory wired for operation from an 234vac line . Operation at the full rated output should not be attempted unless this line is capable of supplying at least 15 amps of peak current. It is strongly recommended that you operate this amplifier from a 23...
12 operating procedure after reading this manual and completing the installation/preparation instructions, position the commander ii front panel controls as follows: • on/off — off • operate/sstandby — standby • multimeter switch — vp (plate voltage) • input — center on scale • load — minimum (count...
13 operating hints the commander ii tune control is a high "q" piston-type tuning capacitor with a 6:1 ratio vernier reduction drive. This control requires about 15 revolutions to tune the unit from 144 to 148 mhz. No pointer or logging scale is provided. Unless you have specified another band segme...
14 limited warranty palstar inc. Warrants the commander ii to be free from defects in material and workmanship under normal use and service for a period of one (1) year from the date of delivery to the first buyer (the “warranty period”). Palstar inc.’s obligation under this warranty is limited to r...
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