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Re: [Discuss-gnuradio] Setting tx_gain > 20 dB => no effect? (USRP2, XC

From: Sven Oliver Kreis
Subject: Re: [Discuss-gnuradio] Setting tx_gain > 20 dB => no effect? (USRP2, XCVR2450)
Date: Thu, 24 Jun 2010 11:11:15 +0200

Hi Marcus,

you are right. Usually it is a very strong signal. But the
specifications talk about 20 dBm tx power. And I receive -13 dBm at a
distance near zero. If I am not mistaken, that is a factor of about
2000(?). So 2000 times less than the ideal value.
(20 dB = factor 100) (-13 dB ~ factor 0.05)

I know I can't expect 20 dBm because of all the factors you have
mentioned like the distance, even if it is very small. No ideal
antenna on both sides perhaps. But -13 to 20 is a bit much, isn't it?
I don't think the micaz is very unprecise. Perhaps a few dBm. Perhaps
it is -8 instead of -13. And perhaps I just get 10 or 15 dBm out of
the URSP2 antenna. Even than there is still a huge factor difference.

So if I didn't calculate something wrong or have wrong assumptions ...
there should be a way to improve it. At least a bit. :)

Sven Oliver

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