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Foundations of Wireless and Electronics, 10th Edition
book

Foundations of Wireless and Electronics, 10th Edition

by M. G. Scroggie, S. W. Amos
October 2013
Intermediate to advanced content levelIntermediate to advanced
570 pages
27h 46m
English
Newnes
Content preview from Foundations of Wireless and Electronics, 10th Edition
475
followed
by a
relatively long interval determined
by CR,
during
which
v
a
and v
b
are the
first half
of an
exponential curve.
The p.r.f.
can therefore
be
conveniently controlled
by
varying
R.
Because/? tends
to
bias
the
transistor
on,
this form
of
blocking
oscillator
is
free-running.
But if a
synchronising signal
is
injected
at
point
a,
just before
the
pulse
is due, v
b
crosses
the
zero line
at
once
and triggers
the
transistor into pulse action.
To
ensure synchronism
the free-running
p.r.f. is
adjusted
to be
slightly lower than
the
sync,
pulse frequency.
Note that oscillators such
as
this, whose frequency depends
on a
time constant,
can b
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Publisher Resources

ISBN: 9781483105574