Hi Martin,
Thanks for your kind offer. I would be very interested in obtaining the taps
for the half-band filters in the X300 series, if it’s not too much trouble.
Another contributor emailed me the taps for a USRP half-band filter yesterday,
but they weren’t 100% sure if the taps were from th
On 19/02/2025 02:22, Brendan Horsfield wrote:
Just to clarify one point: How do you define the start of the
transition region? Do you go from the 3 dB corner frequency, or
something else, like the equiripple bandwidth of the FIR filter?
I just did it visually on an FFT display from the 3dB co
Hi Brendan,
80% is an excellent rule of thumb for both the analog and digital filters.
If you use "odd" decimations (e.g., you try and capture at 66 Msps), then
the digital filter response is worse, but if you capture at say 50 Msps (at
a 200 Msps sampling rate) then you have two nice half-band fi
Just to clarify one point: How do you define the start of the transition
region? Do you go from the 3 dB corner frequency, or something else, like
the equiripple bandwidth of the FIR filter?
On Wed, 19 Feb 2025 at 13:11, Marcus D. Leech
wrote:
> On 18/02/2025 21:45, Brendan Horsfield wrote:
>
On 18/02/2025 21:45, Brendan Horsfield wrote:
Point taken. At this stage we are mainly interested in straight IQ
recording & playback with minimal processing. However, in the future
it would be desirable to be able to display a real-time spectrum trace
& waterfall plot during recording/playba
Point taken. At this stage we are mainly interested in straight IQ
recording & playback with minimal processing. However, in the future it
would be desirable to be able to display a real-time spectrum trace &
waterfall plot during recording/playback, using GNU Radio or something like
it.
As you
On 18/02/2025 19:26, Brendan Horsfield wrote:
I thought your name sounded familiar! 🙂
Overall the X310+UBX-160 appears to be a good fit to our
requirements. My original question was really about ensuring that our
host PC & network interface have sufficient bandwidth to ingest the IQ
data fro
I thought your name sounded familiar! 🙂
Overall the X310+UBX-160 appears to be a good fit to our requirements. My
original question was really about ensuring that our host PC & network
interface have sufficient bandwidth to ingest the IQ data from a pair of
UBX-160s. It would be nice (although n
Thanks for the suggestion about the noise source -- that's what I would
normally do. Unfortunately I haven't actually purchased the hardware yet
-- I was hoping to clarify this issue before raising a purchase order.
Perhaps I should follow this up with one of the application engineers at
NI? The
On 18/02/2025 19:13, Brendan Horsfield wrote:
Thanks for the suggestion about the noise source -- that's what I
would normally do. Unfortunately I haven't actually purchased the
hardware yet -- I was hoping to clarify this issue before raising a
purchase order.
Perhaps I should follow this u
On 18/02/2025 18:45, Brendan Horsfield wrote:
Yes, I assumed that was the case. However, it is not clear from the
X300 documentation how sharp those filters are. Can you tell me how
wide the transition band is at the lower sample rates?
To give you some context, I would like to use an X300 (
Yes, I assumed that was the case. However, it is not clear from the X300
documentation how sharp those filters are. Can you tell me how wide the
transition band is at the lower sample rates?
To give you some context, I would like to use an X300 (or X310) with a
UBX-160 daughterboard to digitise
There will always be some edge roll off. Decimation includes filtering and
those filters cannot be infinitely steep.
Sent from my iPhone
> On Feb 18, 2025, at 2:12 AM, Brendan Horsfield
> wrote:
>
>
> Hi All,
>
> I have a question about the usable bandwidth of the X300 USRP / UBX-160
> da
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