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TTS 26B
Section 3
3 - 2 2 SIMULTANEOUS RECEIVING AND SENDING.
The s e t m a y b e u s e d to s e n d s i g n a l s with a p r e d e t e r -
mined
%
b r e a k into one c i r c u i t while receiving incoming s i g n a l s f r o m another c i r c u i t .
Thus
(
1) the
%
b r e a k of the incoming signal m a y be m e a s u r e d while sending an outgoing signal.
On the o t h e r hand
( 2 )
the incoming s i g n a l m a y b e u s e d to c o n t r o l the speed of outgoing p u l s e s which a r e adjusted to a p r e d e -
t e r m i n e d
70
b r e a k , thus making a pulse r e p e a t e r out of the s e t , o r (3) the incoming p u l s e s f r o m one type
of c i r c u i t m a y b e converted to p u l s e s with the s a m e o r changed
70
b r e a k outgoing i n t o another type of
c i r c u i t .
( 4 ) T h e s e t m a y be u s e d to r e c e i v e d r y loop p u l s e s and simultaneously s e n d out w e t loop p u l s e s ,
o r vice v e r s a .
3 - 2 3 In any c a s e the SEND P P S switch and the ADJ O/o BREAK c o n t r o l a r e s e t f o r the d e s i r e d values f o r
the outgoing s i g n a l and then a r e not changed when adjusting t h e s e t f o r rec.eiving the incoming s i g n a l ,
whether i t
is
a m e a s u r e m e n t , a r e p e a t e r o p e r a t i o n , o r a c o n v e r s i o n .
F o r r e p e a t i n g the p u l s e s both
the speed and the
70
b r e a k would b e adjusted f o r the known v a l u e s of the incoming s i g n a l .
F o r a conver-
s i o n the outgoing pulse speed should b e the s a m e a s the incoming p u l s e s p e e d , but the
70
b r e a k may be the
s a m e o r different f r o m the incoming s i g n a l . F o r a m e a s u r e m e n t of the incoming s i g n a l while the s e t i s
simultaneously s.ending outgoing s i g n a l s , just a s in the c a s e of any receiving m e a s u r e m e n t , the METER
CAL c o n t r o l m u s t b e adjusted to take into account any voltage d r o p a c r o s s any r e s i s t a n c e between the
s e t and the point of application of the s i g n a l to the c i r c u i t to b e m e a s u r e d .
Since this d o e s not involve
changing the p u l s e speed and
7' 0
b r e a k c o n t r o l s i t d o e s not a l t e r the s e t t i n g s of the previously adjusted
pulse speed and
' 3 6
b r e a k of the outgoing signal.
If the incoming p u l s e i s m e r e l y r e p e a t e d o r converted
(but not m e a s u r e d ) adjustment of the METER CAL c o n t r o l i s not n e c e s s a r y a s long a s i t i s s e t n e a r i t s
m i d r a n g e .
3 . 2 4 F o r the f i r s t c a s e l i s t e d in p a r a . 3 . 22 the p r o c e d u r e s should b e evident, keeping i n mind that the
p u l s e speed and adjustment of the
' 1 6
b r e a k f o r the sending s i g n a l m u s t b e adjusted f i r s t and that pulse
s p e e d and
70
b r e a k c o n t r o l s m u s t not b e changed when s e t t i n g u p the p r o c e d u r e f o r the r e c e i v i n g m e a s u r e -
m e n t .
T h i s a l s o applies to the fourth c a s e .
3 . 2 5 USING THE T T S
26B
AS A PULSE R E P E A T E R
- - -
OR CONVERTER.
The following p r o c e d u r e s p r o -
vide f o r the U s e of S e t a s a P u l s e R e p e a t e r o r C o n v e r t e r ( p a r a g r a p h 3 . 2 2 ) .
ACTION
RESULT
a. With no power applied to the s e t , check the
position of t h e m e t e r pointer.
b.
After a d j u s t m e n t , b a c k off the a d j u s t m e n t
s c r e w slightly to reniove contact between the
adjustment s c r e w and the m e t e r m e c h a n i s m .
c .
FIRST i n s e r t the 310-type plug of the power
supply patch c o r d into the 4 8 VOLT jack of the s e t
observing the p r o p e r tip and s l e e v e p o l a r i t y , and
then connect i t to the 48-volt d c supply.
d.
T u r n the SEND P P S switch to the known p u l s e
r a t e of the incoming signal.
Do not change this
setting i n s u b s e q u e n t s t e p s .
e. If the l a m p s did not light r e m o v e the d c power
supply f i r s t , then change the 31 0- type plug to the
o t h e r 48 VOLT jack, and then r e c o n n e c t the 48-
volt d c power supply.
I t should b e on the 100 line of the
%
BREAK s c a l e
( m e t e r e l e c t r i c a l 0). If i t i s off a d j u s t the s c r e w
on the f r o n t of the c a s e to bring i t to this line.
T h i s c o m p l e t e s the m e c h a i n c a l a d j u s t m e n t of the
m e t e r e l e c t r i c a l 0 .
If connection i s not m a d e in this s e q u e n c e a
b a t t e r y supply f u s e m a y blow:
If the wrong 48-
volt jack i s u s e d diode p r o t e c t i o n within the s e t
w i l l p r o t e c t the s e t f r o m d a m a g e , but the s e t
w i l l b e i n o p e r a t i v e i n succeeding s t e p s .
T h i s t u r n s the s e t on.
T h e LINE ( E ) and DROP
(M) l a m p s should light. If they do light proceed
to s t e p f . If they do not light p r o c e e d to s t e p e .
T h e lamps should light.
If they s t i l l do not the
s e t p r o b a b l y i s not r e c e i v i n g p o w e r .
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