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H 52005-301D
21.
At a fourth position of SA, the output of the step attenuator is fed to the unbalanced termi-
nals; the transformer is bypassed in this case
.
The switching arrangements are such that one
unbalanced terminal is one that serves as a balanced terminal at the other positions of SA.
The
other unbalanced terminal is a chassis connection.
22.
A
600
n
resistor Rl9 can be switched into use as a matching load for the attenuator.
This
can be done at any position of the impedance selector SA.
The switching arrangements of SA
are such that at the three positions where different balanced output impedances are obtained, RlH
is connected via SB across the
600
Q
taps of the transformer secondary.
Nov
,
7
9
Chap
.
4
Pnge
5/
G
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