56
|
P a g e
Source
One
use
for
this
function
could
be
to
locate
the
transmit
frequency
of
a
strong
interference
source.
For
this
example,
we’ll
look
for
strong
signal
sources
in
the
850
‐
860
MHz
range.
Start
with
a
wide
span
with
max
hold
on
and
allow
the
function
to
run
for
several
minutes.
Finding
a
Local
Interference
Next,
set
Marker
as
Peak
to
put
the
marker
under
the
strongest
signal.
Now,
set
Marker
as
Center
to
center
the
range
on
the
peak
signal
and
narrow
the
span.
In
this
case,
the
span
is
narrowed
to
2
MHz.
Repeat
this,
narrowing
the
range
again.
Finally,
we’ve
determined
that
the
signal
is
at
about
856.485
MHz.
The
signal
is
about
20
kHz
wide
(the
bar
in
the
middle
of
the
signal
is
at
a
minimum
level
because
it
falls
off
the
5
kHz
step
being
used).
