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Re: [Discuss-gnuradio] Simultaneous TX/RX Sample Code for RFX (FLEX) 400

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] Simultaneous TX/RX Sample Code for RFX (FLEX) 400
Date: Tue, 23 May 2006 08:15:24 -0700

On Tue, 2006-05-23 at 12:39 +0200, Martin Dvh wrote:
> Matt Ettus wrote:
> >>>Although I am aware that the signal will need to be attenuated severely, I
> >>>am unsure what the RF front end of the RFX-400 is spec'd for.  With a 20 
> >>>dBm
> >>>signal at the TX, I am planning to use anywhere from 40 to 60 dB of
> >>>attenuation.  I believe this will give me a -20 to -40 dBm signal at RX2. 
> >>>This should be acceptable, right?  Thanks again for your help, it is much
> >>>appreciated.
> > 
> > 
> > There is enough leakage between the TX and RX side that you won't need
> > to connect them at all.  Just put a dummy load on the TX side.  The
> > TX/RX switch has about 35 dB of isolation.  You may get some extra
> > isolation by setting the RX input to RX2 and putting another dummy load
> > there.
> > 
> > You can also lower the TX power.
> I thought the TX power allways had to be at maximum for the RFX boards.

I meant that you can change TX power by lowering your signal level
numerically.  TX PGA gain must always be at the max.


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