ÿþM o d i f i c a t i o n s f o r I c o m 7 0 6 M a r k 1 , V e r s i o n 1 . 1 D i r k S c h r a y , D G 3 D I S 1 2 . 5 . 0 5
w w w . s c h r a y . d e / d i r k @ s c h r a y . d e
A u d i o m o d i f i c a t i o n f o r I c o m 7 0 6 ( M a r k I ) b y D G 3 D I S , 1 2 . 5 . 0 5
T h e o r i g i n a l s e t u p o f i c o m ´ s 7 0 6 h a s a v e r y p o o r a u d i o q u a l i t y o n t x a n d e v e n o n r x . S o i
t r i e d t o i m p r o v e t h i s a l i t t l e b i t .
A l l t h e p a r t s i n t h i s r i g a r e s m d a n d v e r y v e r y s m a l l , s o y o u s h o u l d
h a v e s o m e e x p e r i e n c e i n s m d - s o l d e r i n g , y o u c a n e a s i l y d e s t r o y
y o u r t r a n s c e i v e r b y d o i n g t h i s m o d s ! !
R e c e i v e r m o d i f i c a t i o n s
" b e t t e r R X - A u d i o o n S S B ( m o r e b a s s e s a n d h i g h e r l o w p a s s f r e q u e n c y )
" b e t t e r R X - A u d i o o n F M ( m o r e b a s s e s a n d h i g h e r l o w p a s s f r e q u e n c y )
" b e t t e r s e n s i v i t y o n V H F - f r e q u e n c i e s o u t s i d e 1 4 4 - 1 4 6 m h z
( f o r N O A A o r a i r b a n d R X )
" c h a n g e a g c - t i m e ( f a s t e r )
T r a n s m i t t e r m o d i f i c a t i o n s
" m o r e b a s s e s i n s s b a n d f m m o d u l a t i o n
" c o o l i n g - f a n a d j u s t m e n t
- 1 -
M o d i f i c a t i o n s f o r I c o m 7 0 6 M a r k 1 , V e r s i o n 1 . 1 D i r k S c h r a y , D G 3 D I S 1 2 . 5 . 0 5
w w w . s c h r a y . d e / d i r k @ s c h r a y . d e
1 . ) F M R e c e i v e r m o d i f i c a t i o n s ( o n l y n a r r o w - F M )
T h e o r i g i n a l F M - N F F i l t e r h a s a c u t - o f f f r e q u e n c y o f 4 0 0 - 5 0 0 H z .
A l l p a r t s a r e o n t h e M a i n - U n i t , t h e p c b u n d e r t h e s p e a k e r . R e m o v e a l l c a b l e s , m a r k a l l
t h r e e c o a x - k a b e l s b e v o r r e m o v i n g . T h e r e d m a r k e d p a r t s h a v e t h e b i g g e s t e f f e c t .
P a r t N r . o r i g i n a l v a l u e c h a n g e d v a l u e
C 1 8 4 ( 1 0 0 n F ) ’! 4 , 7 n F ( C i s t a n I C 1 2 b )
C 1 8 2 ( 1 0 n F ) ’! 4 , 7 - 2 2 n F
C 1 8 1 ( 1 0 n F ) ’! 1 0 - 2 2 n F
N e w F M - F i l t e r :
A f t e r d o i n g t h i s m o d y o u c a n h e a r s o m e d i s t o r t i o n o n v e r y s t r o n g s i g n a l s ( > 9 + 6 0 d B ) .
- 2 -
M o d i f i c a t i o n s f o r I c o m 7 0 6 M a r k 1 , V e r s i o n 1 . 1 D i r k S c h r a y , D G 3 D I S 1 2 . 5 . 0 5
w w w . s c h r a y . d e / d i r k @ s c h r a y . d e
2 . ) S S B R e c e i v e r m o d i f i c a t i o n s
o r i g i n a l S S B - F i l t e r :
A l l p a r t s a r e o n t h e M a i n - U n i t
P a r t N r . o r i g i n a l v a l u e c h a n g e d v a l u e
C 1 6 2 ( 1 0 0 n F ) ’! 4 7 n F o r 3 9
C 4 4 2 ( 2 2 n F ) ’! 4 , 7 n F ( o n l y s m a l l e f f e c t )
2 . ) F M / S S B t r a n s m i t t e r m o d i f i c a t i o n
A l l p a r t s a r e o n t h e M a i n - U n i t
P a r t N r . o r i g i n a l v a l u e c h a n g e d v a l u e
C 1 6 9 ( 4 , 7 n F ) ’! 1 0 0 n F
C 2 1 8 ( 3 3 n F ) ’! 6 6 n F ( s i m p l y s o l d e r 2 2 n F o d e r 3 3 n F o v e r C 2 1 8 )
C 4 2 8 ( 1 0 0 n F ) ’! 1 ¼F e l e c t r o l y t , - t o I C 2 2 , + t o R 4 9 3
3 . ) M i c r o f o n m o d i f i c a t i o n
o p e n m i c r o f o n a n d r e m o v e e l e c t r e t m i c r o f o n . D r i l l a s m a l l h o l e ( 4 m m ) t o t h e o u t s i d e a n d
m o u n t e l e c t r e t m i c r o f o n . S o u n d s m o r e n a t u r a l l y .
4 . ) C o o l i n g - F a n a d j u s t m e n t
a f t e r t h i s m o d i f i c a t i o n t h e b u i l d - i n f a n o n l y r u n s f a s t w h e n t x o n s h o r t w a v e . T h e f a n i s
d o e s n o t s w i t c h o n w h e n t r a n s m i t t i n g o n 2 m .
R e m o v e b i g R 6 5 ( 4 7 &!) ( o n P A - U n i t , n e a r f a n ) a n d r e p l a c e w i t h 1 0 0 &!
- 3 -
M o d i f i c a t i o n s f o r I c o m 7 0 6 M a r k 1 , V e r s i o n 1 . 1 D i r k S c h r a y , D G 3 D I S 1 2 . 5 . 0 5
w w w . s c h r a y . d e / d i r k @ s c h r a y . d e
5 . ) b e t t e r r x o n v h f o u t s i d e 1 4 4 - 1 4 6 m h z . ( f o r n o a a o r a i r b a n d - r x )
A l l p a r t s a r e o n P A - U n i t
R e m o v e C 5 3 ( 2 0 p F ) a n d C 1 5 3 ( 1 2 p F ) . S o l d e r r e m o v e d 1 2 p F o v e r C 1 5 2 ( 2 0 p F ) .
T h i s m o d h a s n o i n f l u e n c e o n 1 4 4 - 1 4 6 m b a n d f i l t e r b u t n o w y o u h a v e m u c h m o r e
s e n s i v i t y o u t s i d e t h e b a n d
6 . ) c h a n g e a g c - t i m e . T h e a g c - t i m e i s v e r y s l o w , e v e n o n f a s t m o d e . T h i s h e l p s :
A l l p a r t s a r e o n t h e M a i n - U n i t
P a r t N r . o r i g i n a l v a l u e c h a n g e d v a l u e
C 1 4 1 ( 1 0 µ F ) 4 , 7 µ F o r 3 , 3 µ F
7 . ) C h a n g e s s b - c a r r i e r f r e q u e n c y . M a k e s y o u r s s b - m o d u l a t i o n b r i g t h e r o d e r d a r k e r .
C h a n g e t o s s b
P u s h [ d i s p ] - k e y f o r 2 s e c . [ s e t m e n ü ]
P u s h m e n u - k e y u n t i l y o u g e t t o Q 4 [ c a r r i e r - f r e q ]
C h a n g e f r e q u e n c y w i t h v f o - k n o b .
N e g a t i v e v a l u e s m a k e y o u r m o d u l a t i o n d a r k e r , - 1 2 0 i s a g o o d v a l u e
A f t e r a l l t h e T X - A u d i o m o d i f i c a t i o n s y o u h a v e t o r e a d j u s t y o u r m i c - c o m p r e s s o r g a i n ! !
- 4 -
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