Kenwood TS-440S Instruction Manual

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8 . REFERENCE8- 1 . Antenna installation8- 1 - 1 . Fixed stationFor HF fixed -station operat i o n , an ante n n a s p e c i fi c a l l yd e s i g n e d f o r a m ate u r operation i s recom m e n d e d . A nt e n n a types i n c l u d e w i re a nte n n a s , vert i c a l s , rotaryb e a m s , and oth e r antenna type s . ( Fig. 8- 1 ) H F antenn a s a re q u ite l a rge a n d m u st be i n st a l l e d to w ithstandstrong w i n d , heavy ra i n , etc .A n y ante n n a used w i t h the TS -4405 s h o u l d be of50-o h m i m p e d a n c e and s h o u l d be c o n n e cted u s i n g ana p propriate c o a x i a l c a b l e s u c h as R G - 8 /U .I m p e d a n c e matc h i n g is i m po rt a n t . I m pe d a n c e m i smatc h i n g w i l l r e s u l t i n a h i g h VSWR and p o w e r l o s s ,or c a n c a u s e u n w a nted h a r m o n i c r a d i a t i o n a n d i nterference (TV I , BC I ) .The i m pe d a n c e m a t c h c a n b e checked w ith a n SWRmete r . G e n e r a l l y , sati sfactory operation is assuredwhen the VSWR (Voltage Standing Wave R atio ) is lessthan 1 . 5 : 1 .A rotary be a m ante n n a i s very effective for D X comm u n ication i n the 1 4, 2 1 and 2 8 MHz bands. ' ( Fig. 8-2)If open w i re or b a l a n ced t y p e t r a n s m i s s i o n l i n e i s u s e dw ith the ante n n a , a s u it a b l e a n t e n n a t u n e r w ith b a l u ni s recommended between the transceiver a n d the feedl i n e . Methods of c o n struction and operating s u c ht u n e rs a re described i n deta i l i n the A R R L A n t e n n aH a n d book, or s i m i l a r p u b l ication s . For operation on t h e1 60, 7 5 a n d 40 m e t e r b a n d s , a s i m p l e d i pole a n te n n a ,c u t t o reson ance i n t h e most u s e d portion o f t h e b a n d ,w i l l perform satisfacto r i l y . For operation on t h e 1 0 , 1 5a n d 20 meter b a n d s , t h e eff i c i e n c y of the stat ion w i l lbe greatly i n c reased if a good d i rect i o n a l rotary ante nn a i s used . R e m e m b e r t h at ev.e n the most s o p h i st i c ated transceiver is u seless w ithout a good ante n n a .G ro u n d p l a n e a n t e n n aD i po l e a n te n n aFig. 8- 1Fig . 8-28- 1 -2 . Mobile( 1 ) Ante n n aU s e a s t u r d y mount for the m o b i l e a nte n n a s i n c e H Fantennas a r e l a rger ( a n d h a ve more w i n d loa d ) a n d areheavier than VHF ante n n a s . A bumper mount i s recommended f o r general use . T h e ground s i d e of t h e m o u ntm u st be w e l l grounded to the c a r bod y , s i n c e the bodyitself f u n ct i o n s as t h e g ro u n d p l a n e for t h e m o b i l e a nte n n a . ( R efer t o Fig . 8-4)N otes :1 . S o m e c a rs have p l astic b u m p e r s . F o r s u c h c a r s ,g ro u n d t h e ante n n a m o u nt to t h e bod y .2 . When t u n i n g a n e w l y i n stalled ante n n a , u s e t h e foll o w i n g proce d u re :• Turn the CAR control f u l l y counter-c l ockwise form i n i m u m t r a n s m i t pow e r .• W i t h t h e tra n sceiver i n tra n s m it m o d e . raisetransmit powe r output slowly by rota i n g the CARcontrol clockw ise . The antenna should be adjusted w ith m i n i m u m p o w e r .• T r a n s m i t t i n g w ith f u l l power i s rec o m m e n d e do n l y afte r the ante n n a h a s b e e n adj u sted for aVSWR b e l o w 1 . 5 : 1 .3 . A nte n n a i n sta l l a t i o n i s c riti c a l for successful m ob i l e operation . F o r further i n formation r e f e r to T H ERA D I O A MATEU R ' S HA N D B O O K , RA D I O HA N DB O O K , or other texts .( 2 ) Coaxial cable connectionWhen t h e a nt e n n a i s m o u nted on t h e b e h i c l e s b u mper, t h e c o a x i a l c a b l e f r o m t h e a n t e n n a c a n be routedt h r o u g h a d r a i n hole i n t h e tru n k . When the ante n n ai s roof m o u nted p a s s t h e c a b l e bet w e e n t h e b o d y a n dd o o r . L e a v e a d r i p l o o p at t h e l o w e st p o i n t i n t h e c a b l ebefore e n t r y i n t o t h e vec h i c l e to p revent w a t e r fromentering t h e c a r .( 3 ) AdjustmentSome mobile a nten n a s a re not designed at 50-o h m impre d a n c e . I n this case, i m pe d a n c e m a tc h i n g betweenthe ante n n a a n d t h e coaxial cable ( 50!l ) i s req u i re d .T h i s c a n be a c h ieved by u s i n g an ante n n a m atc h i n gd e v i c e or c o u p l e r .35