You are probably ok, but you might also want to use bandpass filters to
keep the excess TX power out of the RX.

Matt

On Wed, Jan 4, 2012 at 2:59 PM, Ed Criscuolo <edward.l.criscu...@nasa.gov>wrote:

> I'm working on an application that will do full-duplex using an RFX2200
> daughterboard in a USRP1.
>
> The transmit frequency will be about 2.055 GHz, and the receive freq
> will be about 2.255 GHz.
>
> Up until now, we've been working with only the transmit or the receive
> flowgraph separately.  Now we're about to integrate the two and I have
> concerns.
>
> In the lab, the transmit and receive sides will be hooked to separate
> antennas.  I am aware that the input to the receiver should not exceed
> -10dBm in order to avoid damaging it.  I'm concerned that the transmit
> antenna will be a short distance away, blasting out 100mW (+20dBm).
>
> Am I right to be concerned?  By my rough back-of-the-napkin
> calculations,  with 3dB antennas, and about 1 1/2 meters separation,
> I should be between -20 dBm and -10 dBm at the receiver.
>
>
> @(^.^)@  Ed
>
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