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Re: [Discuss-gnuradio] USRP in TDD mode

From: Andrey A
Subject: Re: [Discuss-gnuradio] USRP in TDD mode
Date: Fri, 25 Sep 2009 15:20:07 +0400

I finally figured it out.
To automatically switch between TX and RX paths it's needed to call


On Wed, Sep 23, 2009 at 8:12 PM, Andrey A <address@hidden> wrote:
I tried connecting antenna to RX2 and signal strength increased.
I use std_2rxhb_2tx.rbf with RFX2400 DB.
Am I correct assuming that if only RX is enabled then RX/TX antenna is used and if with TX and RX are both enabled TX samples go to TX/RX antenna, and RX samples go thru RX2 ?

If previous assumption is right, how to make TX and RX samples to thru the same antenna?


On Wed, Sep 23, 2009 at 6:54 PM, Andrey A <address@hidden> wrote:
Thanks for reply. I tried std_2rxhb_2tx.rbf firmware from gnuradio 3.2.2 and results are the same. Without enabling transmitter at the receiver the received signal range is [-15e3; +15e3], and after enabling transmitter it became [-2400; +2400].
The workaround you mentioned is not applicable in my situation, since I need to receive and transmit from the same antenna.

I'm not sure if I enable receiver and transmitter simultaneously in the right way.


On Tue, Sep 22, 2009 at 9:55 PM, Stefan Brüns <address@hidden> wrote:
On Tuesday 22 September 2009 19:47:10 Andrey A wrote:
> Hello.
> I'm trying to build a two-way TDD system with two USRP1 boxes in pure C++
> using libusrp and inband_2rxhb_2tx.rbf firmware.

IIRC the ib firmware has a bug not switching the antennaes correctly.
Workaround: set RX antennae to RX2 and connect an antenna to each port.


 Stefan Brüns  /  Bergstraße 21  /  52062 Aachen
phone: +49 241 53809034   mobile: +49 151 50412019

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