RE: [Discuss-gnuradio] USRP2 with FLEXRF2400 db

[Matigakis Emmanouil]

Thanks I appreciate your reply. I think I have the same problem with
alliasing but my biggest problem is the gain control. I haven't updated
to the current firmware version yet. I hope it will solve the problem.

Manolis


-----Original Message-----
From: Michael Ossmann [mailto:address@hidden]
Sent: Wed 11/26/2008 9:12 PM
To: Matigakis Emmanouil
Cc: address@hidden
Subject: Re: [Discuss-gnuradio] USRP2 with FLEXRF2400 db

On Wed, Nov 26, 2008 at 11:00:54AM -0500, Michael Ossmann wrote:
>
> I took an acquisition yesterday with usrp2_rx_cfile.py -f 2414e6
> which looks good except that there is aliasing centered at 2412.5
> MHz.

I may have spoken too soon about the aliasing as my results appear
inconsistent.  I took two simultaneous (not synchronized)
acquisitions with:

usrp2_rx_cfile.py -s -e eth1 -d 4 -f 2414e6 -g 80 -N 500e6 foo &
usrp2_rx_cfile.py -s -e eth2 -d 4 -f 2414e6 -g 80 -N 500e6 bar &

Each gigabit card was connected directly to a USRP2.  Each USRP2 was
running firmware built from rev 10037 and had an RFX2400 installed.
One of the acquisitions exhibits aliasing, but the other does not.

I will try to repeat this next week and see if I made a mistake
somewhere.