[USRP-users] WBX Frequency Response
simon at hb9drv.ch
Fri Jun 1 16:00:56 EDT 2012
Using 5Ms/s sorted this problem.
Simon Brown, HB9DRV
You are standing at the end of a road before a small brick building. Around
you is a forest.
A length of co-ax runs out of the building and down a gully.
From: usrp-users-bounces at lists.ettus.com
[mailto:usrp-users-bounces at lists.ettus.com] On Behalf Of Josh Blum
Sent: 01 June 2012 21:53
To: usrp-users at lists.ettus.com
Subject: Re: [USRP-users] WBX Frequency Response
On 06/01/2012 12:35 PM, Simon HB9DRV wrote:
> Hi All,
> After much keyboard pounding I've managed to get data from my WBX
> (Windows 7, 64-bit, Debug mode). Please look at the screenshot below,
> the sample rate ( using set_rx_rate() ) is 4MB. The response doesn't
> seem flat when the sample rate is anything above 2MB. Is this to be
> expected? I have set the RF Gain to the maximum of 38dB.
MB = megabytes
Msps = megasamples per second
Perhaps you are seeing the CIC filter rolloff. decimation =
100Msps/host_sample_rate. So for odd decimations, you get CIC filter and no
halfbands. Try an even decimation, you should see a flatter noise floor.
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