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Re: [Discuss-gnuradio] Problems Changing USRP Sink Center Frequency Duri
From: |
Martin Braun |
Subject: |
Re: [Discuss-gnuradio] Problems Changing USRP Sink Center Frequency During Runtime |
Date: |
Fri, 16 Dec 2016 15:32:25 -0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 |
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
>
>
>
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