1. Manuals
  2. Brands
  3. EHRHORN Manuals
  4. Amplifier
  5. PA-77
  6. Instruction manual

EHRHORN PA-77 Instruction Manual

Linear power amplifier
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
INSTRUCTION AND TECHNICAL MANUAL
IDODEL PA-77 LIN EA R POWER A M P L IF IE R
r«C#tt0£Q«$tA* tftft »x v-jK: ...
EHRHORN TECHNOLOGICAL OPERATIONS,
INC.
B R O O K SV IL LE , FLORIDA 33512
N o v e m b e r
1 ,
1 9 7 2

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the PA-77 and is the answer not in the manual?

Questions and answers

Related Manuals for EHRHORN PA-77

Summary of Contents for EHRHORN PA-77

  • Page 1 INSTRUCTION AND TECHNICAL MANUAL IDODEL PA-77 LIN EA R POWER A M P L IF IE R r«C#tt0£Q«$tA* tftft »x v-jK: ... EHRHORN TECHNOLOGICAL OPERATIONS, INC. B R O O K SV IL LE , FLORIDA 33512 N o v e m b e r...

  • Page 2: Table Of Contents

    BOTTOM V I E W ............. 20 REMOVAL OF POWER S U P P L Y ........21 C IR C U IT DIAGRAM ( S C H E M A T IC ) ......22 EHRHORN TECHNOLOGICAL OPERATIONS, IN C .
  • Page 3 . B R O O K SV ILLE, FLORIDA EHRHORN TECHNOLOGICAL O PERATIONS, IN C.

  • Page 4: Section 1 - General D Esc Riptio N And S P E C If Ic A T Io N S

    5ECTI0N 2 INSTALLATION 1. U n packin g i Open th9 m arked end of b o th o u te r and in n e r c a r t o n s and c a r e f u l l y remove th e p la s tic - tiira p p e d a m p l i f i e r .

  • Page 5: Section 2 - Installatio N

    5ECTI0N 2 INSTALLATION 1. U np acking i Open th9 m arked end of b o th o u te r and in n e r c a r t o n s and c a r e f u l l y remove th e p la s tic - tiira p p e d a m p l i f i e r .
  • Page 6 3 . E l e c t r i c a l I n s t a l l a t i o n i i l l u s t r a t i o n on n e x t p ag e) A-C Pomer - The ALPHA 77 i s d e sig n e d f o r o p e r a t io n from a 220 to 250 v o l t ,...

  • Page 7: Rear Panel In T Er C O N N Ec T Io N S

    ALPHA 77 REAR PANEL INTERCONNECTIONS WITH TRAN SCEIVERS. TRANSMITTERS * AND R E C E IV ER S Warm a i r e x h a u s t Wain a - c power ALC t h r e s h o l d a d j u s t i n p u t c o n n e c t o r (T u r n c o u n t e r c l o c k ­...

  • Page 8: Section 3 - Operation

    _ 5 _ SECTION 3 OPERATION 1 . C o n tr o l F u n c t lo n s i a . NODE CONTROL PUSH BUTTONS — The f o u r b u tto n s to th e r i g h t o f trie HLM T fc C IRHLN [ m eter c o n t r o l pouier o n - o ff and o p e ra ­...

  • Page 9: 2 . Tune-Up P R O C E D U R E

    BAND — The a p p ro x im a te a m p l i f i e r p la t e t u n in g / lo a d in g range a v a i l a b l e in d i c a t e d in MHz on th e s k i r t of the k no b .
  • Page 10 ( 3 ) In s u r e t h a t a s u i t a b le m atched lo a d f o r the fr e q u e n c y to be used i s c o n n e c te d to th e a m p l i f i e r 's RF OUT j a c k .
  • Page 11 (0 ) no c l e a r p l a t e c u r r e n t d ip is fo u n d n e a r th e in d i c a t e d p r e lim in a r y s e t t i n g , p re s s the FWD b u tto n an d tune f o r a...

  • Page 12: Protective D E V Ic E S , Operating Precautions

    NOTEi GRID OVERCURRENT RELAY KICK-DUT DURING SSB OPERATION i s a c l e a r and d e f i n i t e i n d i c a t i o n of e x c e s s iv e d r i v e p ow er, a t l e a s t on p e a k s , f o r th e degree of a m p l i f i e r...
  • Page 13 -10- b . PLATE OVERCURRENT BREAKER — I f a m p l i f i e r p la t e c u r r e n t s u b s t a n t i a l l y e x ceed s s a f e o p e r a t in g l e v e l s ( a p p r o x im a t e ly 1 .0 am pere f o r b r i e f...
  • Page 14 -11- DRIVE POKIER VERSUS LOADING ADJUSTMENT — S a f e , lo w - d i s t o r t i o n o p e r a tio n of any l i n e a r power a m p l i f i e r demands t h a t p l a t e lo a d in g be s u f f i c i e n t l y h eavy f o r th e d r iv e...

  • Page 15: Section 4 - Maintenance And Tro Ublesh O O Ting

    SECTION 4 MAINTENANCE AND TROUBLESHOOTING most a p p a r e n t prob lem s w it h th e ALPHA 77 r e s u l t from u s e r s * f a i l u r e t o re a d and th o r o u g h ly d ig e s t th e c o n t e n t s o f t h i s m an u al, r a t h e r th an from a c t u a l equip m ent p ro b le m s .
  • Page 16 . CAUTION! Damaae t o PA-77 m i l l r e s u l t from atten u ated o o e r a t io n ! d io d e s D17 o r D18.

  • Page 17: Section 5 - Theory Of O P E R A T Io N

    -14- SECTION 5 THEORY OF OPE RATI O N 1 . BB77/3CX1500A7 RF A M P L IF IE R C IR C U IT ! R e f e r r in g to th e ALPHA 77 s c h e m a tic d ia g ra m , th e r - f s e c t i o n o f th e eq uip m en t i s t o th e l e f t ,...
  • Page 18 -15- f a u l t c u r r g n t l i m i t i n g to p r o t g c t c i r c u i t com ponents in th s s v s n t o f momentary h ig h v o lt a g e f l a s h o v s r .
  • Page 19 -16- 4 . WARW-UP TIHIE DELflYi Upon a p p l i c a t i o n o f p r im ary power t o the ALPHA 77, v o lt a g e on th e +18 v o l t buss r e g u la t e d by D9 r i s e s from z s ro t o +18 v o l t s le s s th a n ons se c o n d , and tim in g c a p a c i t o r...
  • Page 20 -17- R e s i s t o r s R11 , R47, R4, and R7 — a s u ia ll a s th e " Q 's " of the r e s o n a t in g in d u c t o r s p r e v io u s ly m en tion ed —...
  • Page 21 - IB - 1 0 . LOW VOLTAGE D-C S U P P L IE S ) D iodes D 1 and D4, r e s p e c t i v e l y , h a l f ­ wave r e c t i f y a - c o u tp u ts from th e tr a n s f o r m e r o f 44 v o l t s and 22 v o l t s rm s, w h ich a r e f i l t e r e d...

  • Page 22: Section 6 - Il L U S T R A T Io N S

    SECTION 6 ILLUSTRATIONS F i g u r e 6-1 i TOP C36 ( u n d e r ) D5-D8 under PCS R9 under PCB R44 (R43 u n d e r ) C48/L17/...

  • Page 23: Bottom View

    F i g u r » 6-2i BOTTOM VIEW...

  • Page 24: Removal Of Power S U P P L Y

    F i g u r e 6 - 3 REMOVAL OF POUER SUPPLY F i g u r e 6 - 4 i TOP VIEU) UIITH UiARfn A IR EXHAUST HOCD REMOVED...

  • Page 25: C Ir C U It Diagram ( S C H E M A T Ic )

    1 K ll R M RF POWER AMPLIFIER 8877 V, ^ a l u e s I. A l l . K - K ilo bits, M - IAè&ohhs. ~R's o h m s , e x c e p v M£j«8eR Cs f f , Ex cePr ü...
  • Page 26 In o D Ë . I » 2 Z. U l / f M Z.ïO-l.'iOVAC. SO-tOH*. ! PHAse, S w t e t EHRHORN TE CHNOLOSICAL OPERATIONS, B K . ENGINEER ec*oHHS. D R W G N O . S I Z E DESIGNER - 7 7 S c h e m a t i c .

Table of Contents