Commander vhf-144 2 meter 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 safety warnings and precautions 6 front & rear layout 7 installation preparation 8 operating procedure 9 operating hints 10 typical operating conditions table 10 warranty, service, and returns 11 hv power supp...
3 introduction the commander vhf-144 is a grounded grid ab2 linear power amplifier that oper- ates 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 op...
4 high voltage transformer t/r relay board ball bearing cooling blower load tuning capacitor input tuning piston capacitor 3cpx800a7 triode tube filament transformer high voltage interlock switch duel meter control board w/ mutliple led backlighting high voltage board commander vhf-144 inside layout...
5 specifications commander vhf-144 2 meter vhf linear power amplifier • frequency range: 144 to 148 mhz. • modes: usb, lsb, rtty, fm, cw. • power requirements: 200/234vac 50/60 hz. • rf drive power: 10 to 15 watts nominal; 30 watts maximum, for full 1 kw (cw) output. • grid-trip current: 70ma • rf o...
6 unpacking instructions carefully remove your commander vhf-144 from its shipping carton making sure there is no damage evident from shipping. If there is any damage, notify the delivering shipper imme- diately, fully describing the damage. Do not destroy the packing material , since it may be reus...
7 ground lug multimeter: plate current/ plate voltage tune control multi-turn piston capacitor preset at factory multimeter: relative output/grid current load control input control standby/ operate switch on/off switch power ready light rf in rf out bypass swr adjust rear panel layout front panel la...
8 installation preparation the commander vhf-144 is factory wired for operation from an 234vac line . Operation at the full rated output should not be attempted unless the ac line is capable of supplying at least 15 amps of peak current. It is strongly recommended that you operate this amplifier fro...
9 operating procedure after reading this manual and completing the installation/preparation instructions, position the commander vhf-144 front panel controls as follows: • on/off — off • operate/sstandby — standby • input — center on scale (50-55 on scale) • load — minimum (counter-clockwise) (100 o...
10 operating hints the commander vhf-144 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. Unless you have specified another band segment, the unit is factory tuned at 144...
11 limited warranty palstar inc. Warrants the commander vhf-144 to be free from defects in material and work- manship 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 lim- ...
12 commander vhf-144 hv power supply.
13 a c m a i n s a n d s t e p - s t a r t b o a r d ( v h f - 1 4 4 ) ~ 1 3 .5 v a c.
14 c o n t r o l a n d m e t e r i n g b o a r d v h f - 1 4 4.
15 rf deck vhf-144.
16 commander vhf-144 t/r relay board.
17 commander vhf-144 voltage doubler power supply board.
18 rf deck 3cpx800a7 triode tube load tuning capacitor input tuning piston capacitor rf plate choke plate capacitor 120pf/7.7kv.
19 dual meters grid current: scale 0-60ma single tube top 0-120ma two tubes mid 0-180ma three tubes bottom grid current: scale 0-600ma single tube top 0-1200ma two tubes mid 0-1800ma three tubes bottom.
20 meter board cathode fuse.
21 step-start board ac main fuse (20a) x 2 ac interlock step/start relays x 4.
22 power supply 470uf capacitor 450 vdc x 8 hv sense rf output.
23.
24 palstar incorporated 9676 n. Looney rd., piqua, oh 45356 usa customer service and sales telephone: 1-800-773-7931 fax: 1-937-773-8003 email: info@palstar.Com version 1.0 2010.03.29.
