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List:       gnuradio-discuss
Subject:    Re: [Discuss-gnuradio] Problems Changing USRP Sink Center Frequency During Runtime
From:       Martin Braun <martin.braun () ettus ! com>
Date:       2016-12-16 23:32:25
Message-ID: 90c03eff-9f85-2644-d439-f38adeb42735 () ettus ! com
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Sean,

not entirely clear what you're question is. Can you please clarify.

Cheers,
Martin

On 12/15/2016 08:42 AM, Sean Horton wrote:
> After about a week of debugging why I was having trouble receiving
> multiple AX25 packets when sent together, I've discovered the issue
> seems to be that if the initial center frequency of the usrp sink is not
> the frequency that it is changed to after it starts running, then the
> problem surfaces. Tweaking parameters in other blocks, like quad demod
> and clock recovery mm have had almost no impact.
> 
> The code is supposed to allow the center frequency (and other
> parameters) to be changed while running, which is why just setting the
> center frequency to the frequency I'm using for testing is not the best
> way to solve this. 
> 
> What sending multiple ax25 packets look like. There's a single 0x7E
> between each ax25 packet, which is allowed by the specifications. Also,
> an icom radio works just fine, and it's in a different room.
> 
> <~100 bytes of preamble> <AX25> <AX25> <AX25> <AX25> <postamble>
> 
> Also, if the radio is sending one ax25 packet at a time, even when the
> starting center frequency is 100 MHz+ away from where the radio is
> transmitting at.
> 
> -- 
> Sean Horton
> 
> 
> 
> _______________________________________________
> Discuss-gnuradio mailing list
> Discuss-gnuradio@gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 


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