# Problems with adapting the ASK Example to 15 MHz

**URL:** <https://discourse.myriadrf.org/t/problems-with-adapting-the-ask-example-to-15-mhz/4383>\
**Category:** LimeSDR\
**Created:** [15 March 2019 15:39 UTC](https://discourse.myriadrf.org/t/problems-with-adapting-the-ask-example-to-15-mhz/4383 "2019-03-15T15:39:00Z")\
**Posts on this page:** 1\
**Showing post:** 13

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**Author:** ![mzs](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/mzs/32/2678_2.png) [@mzs](https://discourse.myriadrf.org/u/mzs)\
**Post date:** [29 March 2019 17:30 UTC](https://discourse.myriadrf.org/t/problems-with-adapting-the-ask-example-to-15-mhz/4383/13 "2019-03-29T17:30:46Z")

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> [@Martin\_T](#):
>
> According to the LMS7002M\_Datasheet i think the don’t share the same PLL:

By default they do not, but it can be enabled, which is mentioned in the datasheet “[The transmit PLL could also be routed via switches to the receive PLL so as to offer phase-coherent operation in TDD mode.](https://wiki.myriadrf.org/LimeMicro:LMS7002M_Datasheet#Synthesisers)”

And instructions how to enable TDD mode were provided for [LimeSuite GUI and using the Lime Suite API](https://discourse.myriadrf.org/t/limesdr-usb-synchronization-and-toggle-tdd-fdd-mode/1791/5).

But if TDD mode is not enabled, the default behaviour is to have a RX clock synthesizer and a TX clock synthesizer, which generate the shared RX local oscillator chain for both RX channels and a shared TX local oscillator chain for both TX channels respectively. [LimeMicro:LMS7002M Datasheet - Myriad-RF Wiki](https://wiki.myriadrf.org/LimeMicro:LMS7002M_Datasheet#Functional_block_diagram)

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