[USRP-users] N210 WBX annoying spurs while switching

bob wole bnwole at gmail.com
Thu Oct 23 01:08:43 EDT 2014


So you are suggesting that I should zero pad samples at start and end of my
burst to avoid this ?

On Wed, Oct 22, 2014 at 9:16 PM, Matt Ettus <matt at ettus.com> wrote:

>
> When you start and stop transmission without smoothly ramping the signal
> to zero at the beginning and end, you will create wideband spurs.  Just
> think about it as amplitude modulation.  Even if you are transmitting a
> pure sine wave, if you turn it on and off quickly, it will create out of
> band spurs.  Hams call this keyclicks.
>
> Matt
>
>
> On Wed, Oct 22, 2014 at 1:25 AM, bob wole via USRP-users <
> usrp-users at lists.ettus.com> wrote:
>
>> I noticed that there are a lot of significant spurs generated in the
>> output of WBX, on different frequencies randomly, when I use tx_time,
>> tx_sob_tx_eob tags. I do not see these spurs if I transmit continuously.
>> These spurs appears only when I start and stop transmission using stream
>> tags.
>> How can I get rid of these spurs and what is the cause?
>>
>> -
>> Bob
>>
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>> USRP-users at lists.ettus.com
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>>
>>
>
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