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HP 11757B
error output of your BERT is sending one pulse for
every four errors, set the scale factor to four. To set
the scale factor press
displayed, then use the
factor your want, then press
7. The display should now read
do not need to use AGC or set anything in the next
three steps unless you intend to have a notch in the
band before the start of a test. If you are not using a
notch, go to
Measurement Setup
Gain Control) maintains the power level of the
spectrum sent through the Fader. You want the
power level to remain constant even though a notch is
sweeping through the band. If you are interrupting
the digital radio after its own internal ALC or AGC
circuitry, you may have to use the Fader's internal
AGC circuitry to prevent non-fade e ects from
distorting measurement results. Press
use the
key to display AGC ON if AGC OFF is
485
displayed. Press
4 ENTER 5
8. The display should now read
AGC is ON, you should ensure that you have the
proper AGC center frequency set. Press
and the display will change \
whatever frequency may have been set previously.
Use the arrow or data keys to set the desired
frequency, then press
9. The display should no read \
allows you to set the bandwidth to distribute the
AGC power over. Press
this is set to. Use the arrow or data entry keys to
set a value. Use a value close to the radio's channel
bandwidth, then press
now complete.
Digital Radio Testing
when
4 ENTER 5
3 SCALE FACT
arrow key to display the
485
again.
4 ENTER 5
4 AGC ON/OFF
. AGC (Automatic
4 ENTER 5
to exit.
. If the
5 AGC FREQ
4 ENTER 5
AGC FRQ 070.0
.
4 ENTER 5
". This
6 AGC BW
to see what value
4 ENTER 5
. The radio setup is
4 ENTER 5
is
. You
, then
" or
1-35
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