On 08/31/2017 12:38 PM, Xingjian Chen wrote:
I found it is about 1dB difference between measurements. Please check
the attachment file for test results I captured by my b200mini. Do you
know how to reduce this amplitude variation? What is the cause you
think led to this issue?
What version of UHD are you using?
One can expect a small amount of variability across restarts--just the
nature of analog hardware. But 1dB seems like more than I would expect.
Since you're using loopback, any such effect would be "amplified"
because both the signal source and receiver are on the same hardware.
Could you repeat your tests with a laboratory signal generator or noise
source?
Thank you.
------------------------------------------------------------------------
*From:* USRP-users <usrp-users-boun...@lists.ettus.com> on behalf of
Marcus D. Leech via USRP-users <usrp-users@lists.ettus.com>
*Sent:* Monday, August 28, 2017 11:07:12 AM
*To:* usrp-users@lists.ettus.com
*Subject:* Re: [USRP-users] Performance Consistency of B200mini
On 08/28/2017 10:17 AM, Xingjian Chen via USRP-users wrote:
Hi,
How consistent is B200mini can be in terms of signal amplitude if I
restart the board? I am sending and getting chirp pulses at the same
time by a B200mini. I found that if I restart the board every time
before the loopback measurement, and comparing pulses between
measurements, the amplitude changed more than amplitude changes in a
single measurement. It seems the gain changed even if I have the same
settings in controlling software. What device in the hardware of
B200mini can lead to this variation? Thank you.
What is the magnitude of the apparent gain variability?
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