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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 19:05:08 +0200
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ok, you two convinced me :) I am not that experienced yet. It just seemed a bit low to me. If it is a value one can expect, I will continue to tune the jamming signal.
The results aren't bad yet. But it is always good to improve efficiency :)

Have a nice day
Sven Oliver

Am 24.06.2010 15:56, schrieb Jeffrey Lambert:
On 6/24/2010 5:11 AM, Sven Oliver Kreis wrote:
Hi Marcus,


But -13 to 20 is a bit much, isn't it?

It's not much at all, in fact, expect a lot more. Look at it only in terms of dB, beccause the fact is, whenever you have a communications system, you can only couple so much energy to the receiver.

I don't think the micaz is very unprecise. Perhaps a few dBm.

A few dBm is horrible precision.

it is -8 instead of -13. And perhaps I just get 10 or 15 dBm out of
the URSP2 antenna.

You will always have some loss. The maximum output power from the AD9862 IC is a maximum value.

Even than there is still a huge factor difference.

That's not huge.

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

The only way you're going to improve this is by using a more efficient antenna or an antenna with gain, or by putting an amplifier on the USRP output. Perhaps it is also likely there is some improvement needed with the jamming signal you are using.

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