# Full duplex with RFX2400 on USRP2

**URL:** <https://www.ruby-forum.com/t/full-duplex-with-rfx2400-on-usrp2/185326>\
**Category:** GNU Radio\
**Created:** [March 18, 2010, 9:52am UTC](https://www.ruby-forum.com/t/full-duplex-with-rfx2400-on-usrp2/185326 "2010-03-18T09:52:06Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![yoshiya-kato](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/f0a364/32.png) [@yoshiya-kato](https://www.ruby-forum.com/u/yoshiya-kato)\
**Post date:** [March 18, 2010, 9:52am UTC](https://www.ruby-forum.com/t/full-duplex-with-rfx2400-on-usrp2/185326/1 "2010-03-18T09:52:06Z")

</div>

Hello gnu-radio friends.

I would like to realize RFX2400 full duplex configuration.

I am using RFX2400 on USRP2 and tried to transmit and receive(fft.py at  
the  
same time.  
But I got unstable spectrum for both TX/RX.  
Here is the video  
And configuration is as below.

* * *

## U-+RFX2400(TX/RX)±—SpectrumAnalyzer. S | R | P | 2-+RFX2400( RX2 )±—Signal Source.

I found RFX2400 schematics from below URL  
[http://code.ettus.com/redmine/ettus/attachments/9/rfx2400.pdf](http://code.ettus.com/redmine/ettus/attachments/9/rfx2400.pdf)

And I believe this situation is because of U202 / U209 to swith state  
cycles  
A-\>B and B-\>A in very often.

I would like to use both U202 / U209 to fix the swith state always to  
“A”.

Would you please let me know how to make U202(RFswitch) / U209(RFswitch)  
fix  
to A state.  
(say “full-duplex mode”)

Do I still need to hardwire fix the RF-swith to A? if there is no FPGA  
image  
/ firmware available to fix them.

Thank you very much in advance.

Best Regards.

## –

æ ªå¼ä¼šç¤¾ãƒ†ãƒ¬ãƒžãƒ³ãƒ»ã‚³ãƒŸãƒ¥ãƒ‹ã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‚º  
åŠ è—¤ç¾©ä¹Ÿ[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
121-0012 東京都足立区青井6-8-11  
電話:03-5888-7300 FAX:03-5888-7301  
Telemann Communications Co., Ltd.  
TEL:+(81)-3-5888-7300 FAX:+(81)-3-5888-7301  
Board Member / Technical Director  
Yoshiya K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

---

<div class="post-metadata">

**Author:** ![yoshiya-kato](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/f0a364/32.png) [@yoshiya-kato](https://www.ruby-forum.com/u/yoshiya-kato)\
**Post date:** [March 18, 2010, 10:02am UTC](https://www.ruby-forum.com/t/full-duplex-with-rfx2400-on-usrp2/185326/2 "2010-03-18T10:02:03Z")

</div>

sorry for send this again.  
video is on [http://www.telemann.co.jp/00012.mts](http://www.telemann.co.jp/00012.mts)

2010å¹´3月18æ—¥17:28 åŠ è—¤ç¾©ä¹Ÿ [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> * * *
> 
> And I believe this situation is because of U202 / U209 to swith state  
> image / firmware available to fix them.  
> 電話:03-5888-7300 FAX:03-5888-7301  
> Telemann Communications Co., Ltd.  
> TEL:+(81)-3-5888-7300 FAX:+(81)-3-5888-7301  
> Board Member / Technical Director  
> Yoshiya K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

## –

æ ªå¼ä¼šç¤¾ãƒ†ãƒ¬ãƒžãƒ³ãƒ»ã‚³ãƒŸãƒ¥ãƒ‹ã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‚º  
åŠ è—¤ç¾©ä¹Ÿ[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
121-0012 東京都足立区青井6-8-11  
電話:03-5888-7300 FAX:03-5888-7301  
Telemann Communications Co., Ltd.  
TEL:+(81)-3-5888-7300 FAX:+(81)-3-5888-7301  
Board Member / Technical Director  
Yoshiya K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)