[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] Fwd: GNU Radio help

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] Fwd: GNU Radio help
Date: Mon, 05 Aug 2013 22:38:08 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7

Hi Vaibhav Rayanade,

your rx sees zero bytes, meaning that the packet decoder does not see any valid packets.
That basivally means it can't decode anything... this can imply a lot of things that happened between
the tx and the rx USRP, including:
- path loss,
- clipping due to high gain,
- frequency offset between LOs of tx and rx USRP,
- wrong antenna for carrier frequency (125 MHz is _kind of_ low... 1/2\lambda is 1.2m),
- wrong frequency for daughterboard (only mixing daughterboard supporting 125MHz rx+tx is wbx to my knowledge, you have one of these?),
- evil multipath, path loss, all kinds of fading, and all the other effects you expect on an RF channel.


On 08/05/2013 08:13 PM, vaibhav rayanade wrote:

1. attached is the GRC file for "FILE TRANSFER USING USRP AND GNU RADIO".

2. the flow graph works fine when done with loop back from modulator to demodulator. but it does not work when connected with USRP. both receive and trans paths are on different machines.

3.  file received is always zero bytes. i could not find the reason why.

will you please help....

thank you...

Discuss-gnuradio mailing list

reply via email to

[Prev in Thread] Current Thread [Next in Thread]