B&K Precision 2658A - Manual - Manual (Page 30)

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4. When is pushed and then the setting is FULL or ZERO span, the frequency span is returned to
the last setting.
5. By pushing ~ , the frequency span in function menu is set.
8.1 Switching Frequency Band
2658A has three frequency bands.
The frequency band is automatically set to the appropriate band based on the center frequency and span.
(At the span less than 200 MHz, only one band is used.)
When the setting frequency range belongs to two bands, the lower band has priority.
The frequency connection point of two bands is fixed as follows.
Two bands Frequency connection point
Base band and Band 1 - 3.4 GHz
Band 1 - and Band 1+ 6.2 GHz
Note: The spectrum may change a little at the frequency connection point.
For accurate measurement, center frequency and span should be set as the measured frequency range in one band.
Frequency band Measured frequency range
Base band 50 kHz to 3.5 GHz
Band 1 - 3.3 GHz to 6.3 GHz
Band 1+ 6.1 GHz to 8.5 GHz
F1
F4 F6