Racal Instruments 3155, User Manual

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User Manual 3155
ArbConnection 3-23
Figure 3-38, The Modulation Panel
FSK
The FSK group contains parameters for controlling the FSK function.
To turn the FSK function on and off, click on the State button in this
group. There are two other sub-groups in the FSK block: Parameters,
and Mode.
Parameters – Allows adjustment of the Ramp Time and Shifted
Sample Clock frequency parameters. To access the required pa-
rameter, click on the button below the parameters sub-group until the
LED next to the desired parameter turns on. The value associated
with the lit LED is displayed on the digital display. You can use the
dial, keyboard, or the [
↑
] [
↓
} keys to adjust the readout to the re-
quired setting. After you modify the setting, press Execute to update
the 3155.
Mode – The Mode group lets you select between two shift options:
hop and ramped. In hop mode, the sample clock hops to the shift
frequency without delays. In ramped mode, the sample clock ramps
to the shift frequency at a rate determined by the Ramp Time pa-
rameter. Click on the option you prefer to select between hop and
ramped modes.