[Discuss-gnuradio] Frequency dependent problem after syncronizing , Please help!

[Bruhtesfa Ebrahim]

Hey all,

I syncronized my USRPs(one is v4.3 and the other v4.5) by using the USRP
clocking notes on http://www.gnuradio.org/trac/wiki/USRPClockingNotes,
to make them frequency and phase syncronized.

I want to use one as TX and other as RX, with XCVR daugherboards on
them.
But, what I got afre syncronizing is a wierd signal with very small peak
at the center frequency;moreover its whole spectrum level and shape
changes randomly with time . I checked that these problem is not a
reception problem; rather it is a problem created when the master and
slave are set at the same frequency. I check this by making the
following experiment.

(I transmit a carrier @4.96GHz from the slave USRP and a carrier @5GHz
from a signal generator.I verify that both transmissions are working
using a spectrum analyser.Then,I run usrp_fft.py on the master USRP.I
see that the master USRP receives the 5GHz transmission from signal
generator without problem, but when i change the center frequency to
4.96GHz to receive from the slave, I got a weird signal.The signal is
not stable, the noise(whole spectrum) level decreases and increases very
fast and it has only a very small peak at the center frequency.Moreover,
the spectrum changes very much with gain.)

I also tried the reverse(using master as transmitter and slave as
receiver) and also changing the carrier frequencies.But, these weird
behavior remains.

So,anyone having similar problems before? please could you help me with
this issue?

Thanks for your help!

Bruhtesfa
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