Re: [Discuss-gnuradio] problem in daughter boards

[Jason Abele]

On Tue, Jul 19, 2011 at 11:20 AM, Josh Blum <address@hidden> wrote:
>
>
> 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
>

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