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Re: [Discuss-gnuradio] Different frequencies for TX/RX and RX2 port on R

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] Different frequencies for TX/RX and RX2 port on RFX2400
Date: Tue, 19 Jun 2007 21:41:07 -0700
User-agent: Thunderbird (X11/20070326)

Tarun Tiwari wrote:
> Hi,
> I was just wondering if someone can give me little bit of information
> about the clocks for TX/RX & RX2 antenna port on RFX2400.
> My questions are related to simultaneous transmission using TX/RX and
> reception using RX2, so my transmit and receive frequencies have to be
> different on the transciever board ( please correct if I am wrong).
> So, I need to know some basics of RFX2400 antenna port operation.
> Do we have different frequency generator circuits for these two ports
> or single circuit used for both?

There are separate VCOs and PLLs for TX and RX.

> Now when I read the mail from Matt (
> http://lists.gnu.org/archive/html/discuss-gnuradio/2005-07/msg00035.html
> ), what I see that there is a clock line difference of around 1 cm.
> So, if I have two different frequency generator circuits for TX/RX &
> RX2 ports, then do we still get this clock line difference? (by
> chance, I am not a microelectronics guy and so, I dont understand the
> meaning of clock line difference and its effect, therefore, I would
> like to know about it in brief)

You don't need to care about that.

> Or, if we have only one frequency generator circuit then can we
> control the different frequencies on these two antenna ports
> simultaneously? If yes, then can you please refere me some
> documents/codes/examples, so that I can understand the use of it? If
> not, then is it done in sequential manner or some priority based
> scheduling?
> Any help would be gratefully accepted.
> Thanks in advance.
> Regards,
> Tarun
> UT Dallas
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