# LibreCellular and LimeRFE
**URL:** https://discourse.myriadrf.org/t/librecellular-and-limerfe/7798
**Category:** LibreCellular
**Created:** [3 January 2023 17:01 UTC](https://discourse.myriadrf.org/t/librecellular-and-limerfe/7798 "2023-01-03T17:01:31Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@rmivdc](https://discourse.myriadrf.org/u/rmivdc)
#### Post date: [3 January 2023 17:01 UTC](https://discourse.myriadrf.org/t/librecellular-and-limerfe/7798/1 "2023-01-03T17:01:31Z")
Hello,
I’m installing the LibreCellular setup with a LimeSDR USB & LimeRFE cellular
Since the cellular output is only J3 on LimeRFE there is no need for that Sysmocom RF Duplexer right ?
Also, do i need a mandatory J12 communication on LimeRFE with LimeSDR to make it work and get the correct switching between Rx/Tx ?
Thank you, great pieces of Hw ! 👌
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### Author:  [@andrewback](https://discourse.myriadrf.org/u/andrewback)
#### Post date: [5 January 2023 11:35 UTC](https://discourse.myriadrf.org/t/librecellular-and-limerfe/7798/2 "2023-01-05T11:35:43Z")
> [@rmivdc](#):
>
> Since the cellular output is only J3 on LimeRFE there is no need for that Sysmocom RF Duplexer right ?
Yes, it integrates duplexers for the cellular bands supported.
> [@rmivdc](#):
>
> Also, do i need a mandatory J12 communication on LimeRFE with LimeSDR to make it work and get the correct switching between Rx/Tx ?
What band are you planning to use? Most LTE bands are FDD and so transmit and receive at the same time, with no switching. Not sure if we’ve considered TDD use with LimeRFE.