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I MODEL 4OO TRANSCEIVER
A,
C ircuit Theory (Cont)
Authorities agree that the average voice
p o w e r i s l 0 t o 2 0 d b b e l o w p e a k v o r c e
p o w e r . N o r m a l l y s o m e p e a k c l i p p r n g i n
t h e P o w e r A m p l i l i e r ( a n b e t o l e r a t e d ,
and a peak-to-average ratio oJ only 6 db
r r a y s o m e t i m e g o c c u r . u n d e ! s u c h a
condition, the average power input will
be 125 \ratts, and plate current will be
about 156 rna.
With an average Po'\r/er
Amplilier
efficiency of 55 per cent, plate
d i s s i p a t i o n w i l t b e 5 7 w a t t s , o r 2 8 , 5
watts per tube.
The 6HF5 is rated at
28 watt6 continuous duty cycle in normal
T V s e r v i c e .
T h u s i t c a n b e s e e n t h a t
under normal operating conditions th€
PA tubes in the Swan 400 are not being
driven very hard.
Only dLrring the tune
up is there any need to exercise caution
by lirniting the length of time the unit is
held in the TUNE position to about 30
s e c o n d s a t a t i m e ,
B .
I N S T A L L A T I O N
CENERAL
T h e S w a n 4 0 0 t r a o g c e i v e r h a s b e e n
d e s i g n e d t o p r o v i d e t h e u t m o s t i n e a s e
of operation,
stability,
versatility,
arld
enjoyment.
Maximum
enjoyment
Irorn
your Swan will depend to a great extent
on the installation.
For fixed station or
portable
use, operation
with the Model
I I ? X B o r I t ? X C p o w e r s u p p l y p r o v i d e s
a ( o m p a ( t d r r d n g e m e n t w i t h m a x r r n u m
e a s e o I o p < r a t i o n .
A I I s w r t ( h r n 8 i s
performed
in the transceiver.
For
m o b i l e i n s t a l l a t i o n s ,
t h e M o d e l l 4 - I 1 ?
supply provides
switching
ar rangements,
and speaker output rnay be fed through
t h e c a r b r o a d c a s t r e c e i v e r 6 p e a k e r ,
POWER SUPPLY
T h e S w a n M o d e l s I I ? X B
o r l l ? X C
p o w e r
Eupplies provide aU neces6ary
voltages
r e q u i r e d b y t h e t r a n s c e i v e r .
T h e
supplies corne equipped with a pre-wired
p l u g a n d c a b l e , a l l ! e a d y f o r p l u 8 g i n g
i n t o t h e t r a n s c e i v e r ,
T h e M o d e l l 4 - I I 7
supply lor mobile operation
includes all
n e c e s s a r y c a b l e s , c o n n € c t o r p l u g , l u s e s ,
and installation
hardwa!e.
The Jones
plug lor connection to the transcervet
ts
furnished
with the unit.
8
Power
requirements
for the Swan 400
are shown in the following
table.
Pin
connections
to the Jones type power
c o n n e c t o r a r e a l s o l i s t e d a s a n a i d i n
connecting
other brands or horne-brew
p o w e r e u p p l i e s .
+AC or DC
EXTERNAL SPEAKER CONNECTIONS
Audio output from
the transceiver
is pro-
vided at pin 12 of the Jones plug.
The
other speaker lead goes to the common
c h a s s i s g r o u n d a t p i n 6 .
O u t p u t i m p e d a n c e
is between 3 and 4 ohms.
For mobile
installations,
the car broadcast
speaker
rnay be used, in ]vhich case a DPDT
P i n
Nornrnal
Minirnum Maximurn
High
Voltage
8
8 0 0 v D c
5 O O M A
6 0 0 V D C
1 0 0 0 v D c
lli. Powe r
Mediurn
V o l t a g e
t 0
z ? 5 v D c
I 5 0 M A
2 2 5 V D C
3 2 5 V D C
B i a s
Voltage
3
- 1 1 0 v D c
I O O M A
- 1 0 0 v D c
- I 3 0 V D C
Filament
Voltage
4
1 2 . 6 Y ' N
5 . 5 a l n p .
I I . 5 V
t 4 . 5 v
R e l a y
V o l t a g e
5
r 2 V D C
2 5 0 M A
I O V D C 1 4 . 5 V D C
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