On Fri, Sep 5, 2008 at 5:04 PM, Richard Jaeger <[EMAIL PROTECTED]> wrote:
> Well, if the gain is really in (0.5, 1), that makes my missing gain
> situation worse. I would be hunting for more than 20,000 in that case.
> Also, it is inconsistent with my measurements that show that the gain
> increas
On Sep 4, 2008, at 12:37 PM, Matt Ettus wrote:
Re CIC gain, there's a also a decimation specific shifter involved in
the path. Please take a look at
Yes. You guys have the R^4 formula right, but the shifter takes
back most of the gain. The actual gain from the CIC decimator once
Q3: MDS measurement
The signal disappears into the noise floor with the attenuator at 66
dB or
10 mV/2000 = 5 uV input signal.
I believe the USRP ADCs are 12 bits with VFS = 2V, so the LSB is 2V/
4096 or
about 488 uV. How is the
system resolving signals that are 20-40 dB below the LSB size?
Re CIC gain, there's a also a decimation specific shifter involved in
the path. Please take a look at
Yes. You guys have the R^4 formula right, but the shifter takes back
most of the gain. The actual gain from the CIC decimator once you
include the shifter is:
R^4 / ( 2^ ceiling(
On Thu, Sep 04, 2008 at 10:04:22AM -0500, Richard Jaeger wrote:
> Brian,
>
> More questions.
>
> Q1: I had second thoughts about the CIC gain.
>
> If I am going to use a 4th order CIC to give an overall decimation of R,
> then the decimation of each stage will be
> the fourth root of R, and the g
Brian,
More questions.
Q1: I had second thoughts about the CIC gain.
If I am going to use a 4th order CIC to give an overall decimation of
R, then the decimation of each stage will be
the fourth root of R, and the gain of the fourth-order filter will be
g = (R^0.25)^4 = R- back to eq
On Sep 1, 2008, at 9:55 PM, Brian Padalino wrote:
On Mon, Sep 1, 2008 at 4:26 PM, Richard Jaeger
<[EMAIL PROTECTED]> wrote:
I have been attempting to calibrate my USRP system. I am running
four
channels and feeding the various channels to
fft sinks following de-interleaving and channel filt
On Mon, Sep 1, 2008 at 4:26 PM, Richard Jaeger
<[EMAIL PROTECTED]> wrote:
> I have been attempting to calibrate my USRP system. I am running four
> channels and feeding the various channels to
> fft sinks following de-interleaving and channel filtering. I am using the
> Basic RX boards, and the P
I have been attempting to calibrate my USRP system. I am running four
channels and feeding the various channels to
fft sinks following de-interleaving and channel filtering. I am using
the Basic RX boards, and the PGA in front of the ADC is set at 20 dB.
For large decimation, the sensitivity
On Wed, Jul 23, 2008 at 07:45:57AM -0700, isaacgerg wrote:
>
> Is there any documentation on what the gain does for the USRP receive and
> transmit functions. Sometimes it seems like these values are meaningless.
Sometimes they are fixed. Have you queried the valid ranges for the
daughterboards
Is there any documentation on what the gain does for the USRP receive and
transmit functions. Sometimes it seems like these values are meaningless.
Also, I am noticing that when I begin to Rx data, there is often a huge
amplitude spike within the first 2k samples I Rx. Is this normal?
--
Vie
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