To open the "Phase Modulation" dialog, select "Modulation > Configure > Phase Modulation" or use the MENU key under "Modulation".
In the upper section of the dialog, the modulation source is selected and the modulation switched on. The modulation source can be selected independently for the different modulation types and the LF output.
The configuration of the selected external or internal modulation source is performed in the lower section of the "LF Output" dialog (internal source only) or in the "Mod Gen" block.
These settings affect all modulations which use the same modulation sources.
An LF generator and a pulse generator are available as internal sources.
Activates ɸM modulation.
Activation of ɸM deactivates frequency modulation.
Remote command:Selects the source for the ɸM signal.
The source can be selected independently for the different modulation types and the LF output. The configuration of the selected external and/or internal modulation source is performed in the lower section of the menu or in the "Mod Gen" block (internal source only).
"Internal" | Uses the internal LF generator as the modulation signal source for ɸM. |
"External" | Uses an externally applied modulation signal. The external signal is input via the MOD EXT connector. |
Sets the modulation deviation in RAD.
The maximum deviation depends on the set RF frequency and the selected modulation mode (see data sheet).
If the entered deviation is too high for the set RF frequency, the instrument provides the maximum value and displays an error message. The same applies, if the RF frequency is set to a value, at which the deviation cannot be determined.
Remote command:Sets the frequency of the LF generator.
This setting affects all analog modulations which use the LF generator as the internal modulation source.
Remote command:Displays the input sensitivity of the externally applied modulation signal at the MOD EXT input in RAD/V.
The modulation deviation entered with "ɸM Deviation""ɸM Deviation" is achieved with 1 Volt (=Upeak) of the input signal.
Note: The input voltage must not exceed 1.1 Vp otherwise modulation distortions occur.
Selects the coupling mode ("AC" or "DC") for the external modulation signal.
Note: Coupling for external feed via input MOD EXT can be set independently for all modulations using the external modulation signal.
"AC" | Disconnects the DC voltage component and uses only the AC component of the modulation signal. |
"DC" | Uses the modulation signal with both components, AC and DC. |
(Source "External" only)
Sets the impedance for the external modulation signal, applied at the MOD EXT connector.
You can select 600 Ohm or high (>100 kOhm).
This setting affects all analog modulations which use the external modulation signal.
Remote command:
Imprint | Statement of Privacy | Terms & Conditions | © 2017 ROHDE & SCHWARZ |