# Problem in daughter boards **URL:** \ **Category:** GNU Radio\ **Created:** [July 19, 2011, 5:24pm UTC](https://www.ruby-forum.com/t/problem-in-daughter-boards/209651 "2011-07-19T17:24:56Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\ **Post date:** [July 19, 2011, 5:24pm UTC](https://www.ruby-forum.com/t/problem-in-daughter-boards/209651/1 "2011-07-19T17:24:56Z")
Dear all i have a usrp1, RFX2400 and WBX and i have a coaxial cable from the wifi card to the rfx2400 TX/RX port i want to pass the stream from the wifi card to the rfx2400 then to the wbx to transmit it over the UHF band how could i do that ?? here is the connection i have created (attached) please help me as fast as you can thanks ---
**Author:** ![eng\_z](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/57b2e6/32.png) [@eng\_z](https://www.ruby-forum.com/u/eng_z)\ **Post date:** [July 19, 2011, 8:37pm UTC](https://www.ruby-forum.com/t/problem-in-daughter-boards/209651/2 "2011-07-19T20:37:48Z")
On 07/19/2011 07:37 AM, Eng.Ziedan wrote: > Dear all > i have a usrp1, RFX2400 and WBX and i have a coaxial cable from the wifi > card to the rfx2400 TX/RX port > i want to pass the stream from the wifi card to the rfx2400 then to the wbx > to transmit it over the UHF band > how could i do that ?? > here is the connection i have created (attached) > please help me as fast as you can > thanks The WBX and RFX TX/RX antenna port is not full-duplex. Perhaps you want a diplexer for your wifi card. From the docs: The user may set the receive antenna to be TX/RX or RX2. However, when using an WBX board in full-duplex mode, the receive antenna will always be set to RX2, regardless of the settings. [http://www.ettus.com/uhd\_docs/manual/html/dboards.html#wbx-series](http://www.ettus.com/uhd_docs/manual/html/dboards.html#wbx-series) ---
**Author:** ![eng\_z](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/57b2e6/32.png) [@eng\_z](https://www.ruby-forum.com/u/eng_z)\ **Post date:** [July 19, 2011, 9:02pm UTC](https://www.ruby-forum.com/t/problem-in-daughter-boards/209651/3 "2011-07-19T21:02:36Z")
On Tue, Jul 19, 2011 at 11:20 AM, Josh B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > please help me as fast as you can > > be set to RX2, regardless of the settings. > > [http://www.ettus.com/uhd\_docs/manual/html/dboards.html#wbx-series](http://www.ettus.com/uhd_docs/manual/html/dboards.html#wbx-series) Also, in direct-cabled applications it is good practice to include attenuation between the transmitting device and receiving device. Many commercial wifi cards output 100mW (20dBm) which can damage a WBX. We recommend limiting the WBX input power to -10dBm or less. Jason ---
**Author:** ![eng\_z](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/57b2e6/32.png) [@eng\_z](https://www.ruby-forum.com/u/eng_z)\ **Post date:** [July 20, 2011, 2:26pm UTC](https://www.ruby-forum.com/t/problem-in-daughter-boards/209651/4 "2011-07-20T14:26:52Z")
On 19/07/2011 12:59 PM, Eng.Ziedan wrote: > Quite apart from the other advice you’ve been given here about safe cabling practices and antenna selections, it looks like you’re trying to implement what’s a called a linear transponder. You’ve got your sample\_rate set to 32Khz, which is very, very, very much narrower than standard WiFi signals. You’ll have to experiment with the smallest bandwidth that sucessfully carries your WiFi signals through.