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ADDENDUM
#I
TO FOLDER #131-666
JNSTALUNG AND OPERATING INSTRUCTIONS FOR
MARCONI
T
RANSMITTER-RECEIVERS TYPES PNIA
and
PNIB
The following modifications have been
incorporated in the
late,t
productions
of
the
PNIA -
PNIB Transmitter-Receivers. This has bccn
done
to
further
improve
the stability and performance or these equip-
ments.
The
changes jn
question have bctn
m.3de in
the receiver sc<"lion,
.and will
appear
in
all
equipments
manufact~rcd
after Septemb<r 21,
1949.
The modifications arc
as
follows:-
·
I. Condenser C 12 becomes 0.05 ml
+
-
20% 400 W.
V.,
Marconi
#911-503.
2.
A
connectin~ link has been added between
Pin
#6 on
V5,
a.nd
Pin
:j:5 on T4. This link
is
used as
a
regeneration adjustment,
being bent slightly
to
increase
or decrease sensitivity.
3.
Transformcn
T4
and
T6 have
each been
replaced
by
Marconi
Type
#
134-952
connected as shown below.
,..,
al
fJI
'Wt
f(t
M.
COM«-
f0
1M
•J
0,
f•
IT sM
~
<-'-"'•C-.-,...
.....
.
.
... a.-
..
aa........,._
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