So, I am finally able to decode something after setting the correct RX
mux... I suppose it was incorrect for this daughterboard.
Does the RX2 port need to be enabled for the RX/TX port on the card to
receive properly?
If I setup the RX as follows......
d_rx->_write_oe(d_side,POWER_UP|RX2_RX1N|ENABLE,0xffff);
d_rx->write_io(d_side,(~POWER_UP)|RX2_RX1N|ENABLE,POWER_UP|RX2_RX1N|ENABLE);
d_rx->write_io(d_side,0,RX2_RX1N);
d_tx->write_io(d_side,~RX_TXN,RX_TXN);
...what I receive looks like this:
http://cyprus.cmcl.cs.cmu.edu/tmp/flex_graphs/flex_rx2dis.jpg
If I enable RX port 2 also, such that I only add this line....
d_rx->write_io(d_side,RX2_RX1N,RX2_RX1N);
... what I receive looks like this:
http://cyprus.cmcl.cs.cmu.edu/tmp/flex_graphs/flex_rx2en.jpg
... and I am now able to get pretty accurate decoding.
But, I was simply wondering if someone can provide insight in to why
this is. Does RX2 need to be enabled?
Thanks,
George
Long, Jeffrey P. wrote:
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:[EMAIL PROTECTED]
Sent: Tuesday, April 29, 2008 11:10 AM
To: Long, Jeffrey P.
Cc: Eric Blossom; discuss-gnuradio@gnu.org
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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf
Of
George Nychis
Sent: Tuesday, April 29, 2008 10:13 AM
To: Eric Blossom
Cc: discuss-gnuradio@gnu.org
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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