RFX2400 Transmit Receive question

Is it possible to simultaneously transmit through ‘TX/RX’ and receive
on ‘RX2’ of a single RFX board?

All I get out of the RX chain is low power noise and I’m trying to
track down the problem but I want to rule out the obvious things (I’ve
spent way too much time on this lately).

Kaleem,

There is a response to this thread from Matt E. (who designed the
RFX) that says you can not use them concurrently.

Jason

For TDMA schemes, it would be very nice to know the delay of the AD/DA
converters (and filters …), and easiest would to measure the signal from
the tx port fed back to the same daughterboard via loopback cable to the rx2.
As far as I understand, this is not possible. (All this requires the
timestamps of the inband signaling, of course).

Would using a second daughterboards rx require a MIMO/modified daughterboard,
or is it ok to use two non-MIMO rfx2400 on the same USRP? In my case,
accuracy of about a few samples would be ok, but there might be other cases
which require higher accuracy.

Stefan,

The post really didn’t have anything to do with MIMO, it was more
about whether the RFX cards were full duplex or not,

I see now that Matt sent the reply to me, not to the list, so here is
what he said:

From: Matt E.

On Friday 29 August 2008 14:41:26 Jason U. wrote:

Kaleem,

There is a response to this thread from Matt E. (who designed the
RFX) that says you can not use them concurrently.

Jason

Hi Jason,

do you remember the threads title or an approximate date?

For TDMA schemes, it would be very nice to know the delay of the AD/DA
converters (and filters …), and easiest would to measure the signal
from
the tx port fed back to the same daughterboard via loopback cable to the
rx2.
As far as I understand, this is not possible. (All this requires the
timestamps of the inband signaling, of course).

Would using a second daughterboards rx require a MIMO/modified
daughterboard,
or is it ok to use two non-MIMO rfx2400 on the same USRP? In my case,
accuracy of about a few samples would be ok, but there might be other
cases
which require higher accuracy.

Stefan


Stefan Brüns / Bergstraße 21 / 52062 Aachen
mailto:lurch at gmx.li http://www.kawo1.rwth-aachen.de/~lurchi/
phone: +49 241 53809034 mobile: +49 151 50412019

I’m sorry, I must have been asleep there. You CAN do that, as long as
you are transmitting and receiving on widely separated frequencies. You
cannot do it on the same frequency.

Matt

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