# HalfDuplex RX/TX
**URL:** https://discourse.myriadrf.org/t/halfduplex-rx-tx/5274
**Category:** Uncategorized
**Created:** [20 October 2019 10:10 UTC](https://discourse.myriadrf.org/t/halfduplex-rx-tx/5274 "2019-10-20T10:10:17Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@KahnSoft](https://discourse.myriadrf.org/u/KahnSoft)
#### Post date: [20 October 2019 10:10 UTC](https://discourse.myriadrf.org/t/halfduplex-rx-tx/5274/1 "2019-10-20T10:10:17Z")
Hi,
when use one antenna for RX and TX , is it conform when i turn RX Antenna while sending to
LNA\_NC or LNA\_NONE to protect RX Input ?
Much thx for helping
Best regards from Berlin.
Karsten.
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### Author:  [@andrewback](https://discourse.myriadrf.org/u/andrewback)
#### Post date: [29 October 2019 09:15 UTC](https://discourse.myriadrf.org/t/halfduplex-rx-tx/5274/2 "2019-10-29T09:15:49Z")
If using one antenna you must use a suitable duplexer or coaxial relay. If you were to simply connect both Tx and Rx ports together with the antenna via a T, I suspect this could cause damage.
@Zack, perhaps you could confirm.
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### Author:  [@KahnSoft](https://discourse.myriadrf.org/u/KahnSoft)
#### Post date: [29 October 2019 10:48 UTC](https://discourse.myriadrf.org/t/halfduplex-rx-tx/5274/3 "2019-10-29T10:48:33Z")
> [@andrewback](#):
>
> both Tx
Hi Andrew,
thx its also not enough to switch rx antenna to None Antenna, util sending. I have it not try out. My radio works nice since 1 year. Using CoaxRelay . Later i must use then the IO Ports , but not clear how i can control the IO/ports from LimeSuite Interface DLL - I need the Ports later too for control the bandpassfilter. (Writing an fm/am/sideband Modulator for the I/Q transfer under windows. State not ready atm … But happy to see that SDR-Console(w10) is the only one, they can send with 750Khz Bandwidth, why this is bandwidth must be so small configured to transmit ? Many questions are open. At end of Life i have all answers i hope 🙂
Thx for responds , best regards from Berlin
Karsten