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Re: [Discuss-gnuradio] High pass frequency response with LFRX boards

From: Drew Read
Subject: Re: [Discuss-gnuradio] High pass frequency response with LFRX boards
Date: Fri, 5 Nov 2010 14:22:50 +1300

Yes! that seems to be doing it.
After using u.set_dc_offset_cl_enable(0x0, 0xf) to disable the dc
correction the Low Freq roll-off seems to be gone and my IQ looks a
lot better.
That's really excelent, I presume I'll still need to compensate for
the dc in my flow graph now though...

Many thanks!

On Fri, Nov 5, 2010 at 1:08 PM, Marcus D. Leech <address@hidden> wrote:
> On 11/04/2010 07:47 PM, Eric Brombaugh wrote:
>> You're probably seeing the high-pass behavior of the RX DC offset
>> removal. There's a logical block inside the FPGA which integrates the
>> ADC DC offset and subtracts it from the incoming signal.
>> This function isn't needed on the TX side.
> Would it have such a high corner-frequency, though? Seems like the DC
> estimate integrator function
>  could easily be arranged to have a corner frequency much lower than
> 1KHz.  But maybe I'm
>  wrong.
> --
> Principal Investigator
> Shirleys Bay Radio Astronomy Consortium
> http://www.sbrac.org
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

Andrew Read +64 (03) 357 0787
Test Analyst
Design Verification and Validation Team
Tait Electronics Ltd
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