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Re: [Discuss-gnuradio] DBSRX filter efficiency?
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] DBSRX filter efficiency? |
Date: |
Mon, 18 May 2009 10:27:52 -0700 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
On Mon, May 18, 2009 at 07:11:43PM +0200, Andreas Bogk wrote:
> Eric Blossom wrote:
>> Hi Andreas! Welcome!
>>
>
> Thanks! :)
>
>> Try turning the Rx gain down.
>>
>
> Been there, done that. It doesn't get rid of the images.
>
>> The datasheets should be on Maxim's site, though I think they're
>> discontinuing the part. If you can't locate them, let me know and
>> I'll see if I can't find one for you.
>>
> I can't find them, and googling for MAX211x only brings me to Gnuradio
> related information. Is there a magic part number I need to know? I'd
> appreciate the datasheets,
OK, I'll look for them later on today.
> or alternatively the information that the
> filters are indeed in the chip and not tunable.
The chip has a controllable IF-filter bandwidth. It can be controlled
using the set_bw method on the daugherboard subdevice. Pass it the
desired bandwith in Hz. The DBSRX code will accept a value between 1e6 and
33e6, though the chip's only spec'd down to 4e6. By default we're
running it wide open (33e6).
Eric