Yaesu MEMORIZER FT-227R Instruction Manual page 27

( 5 ) Tone Bu r s t
a ) C onne ct a
YP-150
di s co nn e ct the mi crophone to p r event a ccidental voi ce mo dula -
ti o n .
b) Tempo r a r ily conne ct pin 5 o f Q 2 1 5 t o p i n 14 .
c) C onne ct a Y C - 5 00 f r e qu e n cy counte r to the emmi te r of Q2 1 6 , arid
s e t TON E BURS T switch to the O N po s ition .
d) K ey the transmi tte r and adju s t VR 2 07 to the d e s i r ed bur s t
fr e quency .
e ) C onne ct VTVM t o MIC IN te rminal and adju s t VR2 09 fo r 2 . 5
m V VTVM r e ading .
f) Remove the temp o r a rily conne cted wi r e in s te p ( b ) .
transmi tte r and adju s t VR2 0 8 fo r de s i r ed bur s t du ration.
R E C E IVER
(1 ) RF Amplifi e r
a) C onne ct the calib rated s ig nal g e ne r ato r to the antenna conne cto r
and s e t the channel s el e c to r to
Tune the s i gnal g e ne r a to r
b)
thr ou gh L l 0 4 and T C l Ol thr ou gh TC1 0 4 fo r maximum S m e te r
r e ading.
(2 ) Fi r s t IF Amplifie r
a) C o nne ct a swe ep gene r ato r to th e s e cond g ate o f Ql 0 2 .
a o s cillos cop e th r ou gh a d e te cto r to the d r ain of Q l 0 3 .
S e t th e f r e quency o f the s w e e p g e ne r a to r t o 1 0 . 7 M Hz and apply
b )
its output
F i g . 1 5 i s availabl e .
c ) Di s conn e ct th e s w e e p g ene r a to r and s cop e .
vo
injection
0 8 0 Vo 1 t rm s .
-1.
•
dummy l o ad t o the antenna conne cto r and
_ to the r e ceive fr eque n cy and p e ak L 101
Adjust TlOl until the scope pattern illustrated in
a
lt ge to the second gate of Ql
Fi gur e 15
- 2 5 -
7. 0 MHz .
14
M e as u r e the R F
0
3 A
nominal value is
.
K e y the
C onne ct