On 04/11/2019 01:29 PM, Peng Xie wrote:
Yes, it is a brand new device that I just got three weeks ago.
So where is this out band interference came from? which kind of filter
I need to consider? And where to put this filter, e.g. between
motherboard and daughter board, or between RF in and daughterboard?
Thanks,
Peng
I cannot tell you where RFI is coming from -- that's something you'd
need to determine for yourself, in your own environment.
The WBX "front end" is fairly broad, and the only analog filtering
happens at the baseband output. What that means is that
there's some probability of out-of-band signals being strong enough
to drive the LNA in the WBX into non-linear operation.
You'd filter between your antenna and the RX input of the device. The
particular attributes of the filter would depend on your
application goals, where the interfering signals (if any) are, etc.
That's standard RF systems engineering stuff that you'd have to
do whether using an SDR or a strictly-analog system.
On Thu, Apr 11, 2019, 10:19 Marcus D. Leech via USRP-users
<usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>> wrote:
On 04/11/2019 10:30 AM, Peng Xie via USRP-users wrote:
> Hi,
>
> Recently I bought a N210 and WBX daughterboard, but found the
signal
> is not stable when I receive signal from 1.575GHz. I had a B200mini
> before but has data lost issue, this is why I bought a N210.
>
> I have confirmed that data does not loss in N210, just signal is
not
> stable. I set frequency to 1575MHz, and sampling rate to 2MHz,
signal
> gain to 30 dB. Every around 8 to 10 seconds, signal power dropped
> around 12 dB then I have to reacquire signal. I did not see this
> phenomenon from B200mini (B200mini has data lost or overflow issue).
>
> Anyone has some thoughts on this?
>
> Thanks,
>
> Peng
>
Was this a brand-new device?
It may be the case that some strong out-of-band signal is causing
so-called "de-sense". You might try putting in a filter.
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