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LEVEL MEASUREMENT
NOISE
Press m to peak preselector tracking. Measure
amplitude by reading marker.
The specific preselector correction factor applied in the example above is stored. A [15::) INSTRUMENT PRESET
will not erase the correction factor; however, another PEAKING routine in the same band will store a new
correction factor in that band.
The factory set preselector tracking can be recalled with [,,, = @ The preselector can be manually adjusted
by pressing (,,, / (":::1 (See Chapter 11.)
How It Works
The internal preselector peaking routine automatically searches and sets the peak response of the YIG filter at the
marker frequency. Each peaking operation only affects the frequency band in which the signal is located (four
possible bands). A correction factor, representing the tracking offset, is stored in memory for that particular band
each time the peaking routine is used. Correction factors (one per band) remain in memory unless a new peaking
routine is initiated that may result in a different number. The last m correction factors are saved along with
control settings in the internal storage registers upon execution of a I-11 followed by a number from 1 to 6. Thus,
up to six correction factors could be saved for any of the frequency ranges listed in the chart below:
NOISE LEVEL MEASUREMENT
When noise level is activated and the marker is placed in the noise, the rms noise level is read out normalized to a
1 Hz noise power bandwidth.
58 Manual Operation
2.0 - 5.8
2
5.8 - 12.5
3
12.5 - 18.6 GHz
4
18.6 - 22
MARKER
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