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Today's Topics:
1. questions about calibration examples in UHD utility (gang li)
2. Re: questions about calibration examples in UHD utility
(Mike Jameson)
----------------------------------------------------------------------
Message: 1
Date: Mon, 28 Jan 2013 15:16:38 -0500
From: gang li <[email protected]>
To: [email protected], [email protected]
Subject: [USRP-users] questions about calibration examples in UHD
utility
Message-ID:
<CAKro2L0KZQLhAHYC0_eg7AZK=l1q7om31uytxut_03elqfv...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Hi, guys,
I am reading the codes for uhd_cal_rx_iq_balance.cpp.
When doing calibration by setting the RX and TX antenna as "CAL", is
the signal from TX directly switched to RX?
And I noticed that in the function set_optimum_defaults(), the tx_gain
is 0 but the rx_gain is 25! Is that too high? I heard that when
directly connecting TX and RX, we should use attenuators. So why does
it set 25 rx_gain? Thanks.
Best,
Gang
------------------------------
Message: 2
Date: Mon, 28 Jan 2013 21:08:19 +0000
From: Mike Jameson <[email protected]>
To: gang li <[email protected]>
Cc: [email protected], gnu radio <[email protected]>
Subject: Re: [USRP-users] questions about calibration examples in UHD
utility
Message-ID:
<CAJcjmiQPoDukiiDS18hU9vyNAg_=qgsqmukybcrzckbkqjm...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi,
Calibration uses full duplex and should only be done without anything
plugged into the 'tx/rx' or 'rx2' ports. There is no direct connection,
just measurement of the residual rf escaping.
Mike
M0MIK
On 28 Jan 2013 20:17, "gang li" <[email protected]> wrote:
> Hi, guys,
>
> I am reading the codes for uhd_cal_rx_iq_balance.cpp.
> When doing calibration by setting the RX and TX antenna as "CAL", is
> the signal from TX directly switched to RX?
> And I noticed that in the function set_optimum_defaults(), the tx_gain
> is 0 but the rx_gain is 25! Is that too high? I heard that when
> directly connecting TX and RX, we should use attenuators. So why does
> it set 25 rx_gain? Thanks.
>
> Best,
> Gang
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
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