# About RTbox frequency conversion control

**URL:** <https://forum.plexim.com/t/about-rtbox-frequency-conversion-control/2043>\
**Category:** RT Box\
**Tags:** rt-box\
**Created:** [April 17, 2025, 2:17am UTC](https://forum.plexim.com/t/about-rtbox-frequency-conversion-control/2043 "2025-04-17T02:17:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![zhihao\_chen](https://avatars.discourse-cdn.com/v4/letter/z/53a042/32.png) [@zhihao\_chen](https://forum.plexim.com/u/zhihao_chen)\
**Post date:** [April 17, 2025, 2:17am UTC](https://forum.plexim.com/t/about-rtbox-frequency-conversion-control/2043/1 "2025-04-17T02:17:22Z")

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Hello everyone,

Can RTbox control frequency? I used PWMOUT (variable), but it can only change the frequency by integer multiples. Does RTbox support frequency control by any multiple? For example, fc’=1.3fc.

Thanks in advance

Best regards,

zhihao chen

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<div class="post-metadata">

**Author:** ![Oliver\_Schwartz](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/oliver_schwartz/32/6_2.png) [@Oliver\_Schwartz](https://forum.plexim.com/u/Oliver_Schwartz)\
**Post date:** [April 17, 2025, 1:54pm UTC](https://forum.plexim.com/t/about-rtbox-frequency-conversion-control/2043/2 "2025-04-17T13:54:24Z")

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> but it can only change the frequency by integer multiples.

This is only true if the option _Synchronization with model step_ is set to _enabled_. Otherwise, the frequency can be controlled freely.