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Re: [Discuss-gnuradio] RFX400 Antenna Connection

From: David Scaperoth
Subject: Re: [Discuss-gnuradio] RFX400 Antenna Connection
Date: Mon, 5 Mar 2007 08:07:29 -0500

what is the receive PGA set to? I find it works best at the midpoint (35 or so). you may want to simply scale back your transmit power with a multiplier block:


I don't know exactly what the correct amount of attenuation is, but 40dB sounds like enough (you'll have to wait for Matt or Eric on that). one way to tell would be to use the usrp_fft.py and send a tone into the 400 board, then you could see what the power level is needed to get the signal in above the noise floor (i.e. strong enough for GNU Radio to see it).

how far away are the boards from each other?

hope this helps.


On Mar 5, 2007, at 5:53 AM, Jeremy Chew wrote:


I am trying to eliminate channel error by using a cable to connect two RFX400s together. The strange thing is that nothing useful seems to get through when the radios are connected by cable. I have tried attenuation in the range from 0 to 40dB and with several cables to no avail. Using antennas works much better.

Do you know what is wrong? And what should the cable attenuation be?


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