RE: [Discuss-gnuradio] help with tuning RFX2400 MIMO_b, weird RX results

[Long, Jeffrey P.]

Yeah, looks better but still some offset on the I rail. The wideness of
the ring could be ISI(whats your BT?) in concert with carrier mismatch
spin if you are using two boards. The only reason I say this is that
the width does not look to be very noise like. Just a guess of course.
:)

-Jeff

-----Original Message-----
From: George Nychis [mailto:address@hidden 
Sent: Tuesday, April 29, 2008 11:10 AM
To: Long, Jeffrey P.
Cc: Eric Blossom; address@hidden
Subject: Re: [Discuss-gnuradio] help with tuning RFX2400 MIMO_b,weird
RX results

I'm getting a little closer...
http://cyprus.cmcl.cs.cmu.edu/tmp/flex_graphs/closer.jpg

it looks like I'm clipping a little bit, and is that "wide circle" 
effect a result of DC offset?

- George


Long, Jeffrey P. wrote:
> Kind of looks like it is clipping to me and possibly some DC offset
> problems. 
> 
> -Jeff 
> 
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On Behalf
Of
> George Nychis
> Sent: Tuesday, April 29, 2008 10:13 AM
> To: Eric Blossom
> Cc: address@hidden
> Subject: Re: [Discuss-gnuradio] help with tuning RFX2400 MIMO_b,weird
> RX results
> 
> 
>> You're not being shunned :)
>>
>> Stating the obvious, it would be great to have 1 complete
>> implementation of the C++ daughterboard code, rather than N partial
>> implementations.
>>
> 
> Hopefully once I get passed my May madness I can work with Michael on

> this.
> 
> Does it look like I am clipping? I am not changing the transmitter  
> between the two dumps. I figured the rx gain was too high but it
seems
> 
> to be being set correctly.
> 
> - George
> 
> 
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