NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PRESEL
PARTIAL
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PRESEL
On
Off
(preselector
on/o)
bypasses
the
preselector
and
low-pass
lter
.
During
normal
operation,
these
lters
are
not
bypassed
in
order
to
minimize
the
presence
of
distortion
products
and
image
signals
.
Setting
N
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PRESEL
On
Off
to
o
bypasses
the
ltering,
but
also
improves
sensitivity
by
8
to
15
dB
,
depending
on
the
frequency
band.
The
setting
of
N
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PRESEL
On
Off
does
not
aect
system
calibration.
Signals
at
the
preselector
input
are
attenuated
by
the
attenuator
inside
the
preselector
instead
of
the
attenuator
inside
an
RF
section
module
,
regardless
of
the
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PRESEL
On
Off
setting.
CA
UTION
If
you
bypass
the
preselector
by
connecting
the
input
signal
directly
to
an
RF-section
input,
the
attenuator
inside
the
RF
section
module
is
not
operative
.
T
o
avoid
damage
to
the
spectrum
analyzer
,
measure
signals
at
the
preselector
input
and
use
the
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PRESEL
On
Off
to
bypass
preselection.
Functional
Type:
preselector
Firmkey
A
ccess:
NNNNNNNNNNNNNN
Freq
Preset
State:
On,
but
hardware
dependent.
a
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PRESEL
PARTIAL
(partial
preselector
peak)
adjusts
the
tracking
of
the
preselector
lter
.
Functional
Type:
preselector
Firmkey
A
ccess:
NNNNNNNNNNNNNN
Freq
Preset
State:
O
Softkey
Descriptions
4-117
Summary of Contents for 70000 series
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