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Re: [Discuss-gnuradio] gr-usrp library

From: Ges
Subject: Re: [Discuss-gnuradio] gr-usrp library
Date: Sat, 15 Apr 2006 12:07:48 -0700 (PDT)

Hi Eric,
Thanks a lot. The gian for tx was different from the rx side.

I having a little trouble understanding the flow of the new gmsk2 implementation.
Can you give me a quick overview of it?

I am confused with where its getting a character to convert and send out. Is there a way to just read a character stream from a file and pass it to the gmsk2_mod to convert and send out? Will the simple_framer work with this implementation?

I am looking a simple implementation where I can read a character stream from a file and send it to across the SMA cable and write it to a file on the receiver side.  If I have a simple implementation working as proof of concept in Click, then i can try a TDMA mac on top of it.


Eric Blossom <address@hidden> wrote:
On Sun, Apr 09, 2006 at 08:56:38PM -0700, Ges wrote:
> Thanks Eric.

> I looked up the max gain. It is 20dB. So I set it to 20 dB on the tx
> and rx side. Also I was using payload size of 1024; so I tried
> different sizes 512, 256 and 64. The size of the file was 1087
> bytes. But it doesnt seem to have any difference. I even tried a
> different frequency - 100MHz. Looks like I will have try the gmsk2
> blocks and see what I am getting. Unless I am going wrong with
> something else!


The max gain is different for the Tx and the Rx sides, and it also
depends on what daughterboards are plugged in.
That's why I pointed you at the gain_range() method.
Your code should ask the rx side *and* the tx side.


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