Hi, here is an update:
I have tried transferring the RFX2400 (rev 30) from the new USRP 4.2 to an
USRP 4.1. Now there seems to be no radiation at all when 2.44GHz is chosen,
even with GR and ping working. It appears that IP tunneling starts up with
no problem though.
Is there something I am supposed to do to set up the RFX2400 before starting
to use it? (I have yet to get any application working with it.) In any case,
how do I reset the programming on the transceiver board/USRP?
(NB: The noise floor mentioned below is more like -90 to -100dB.)
Thanks,
Jeremy
----- Original Message -----
From: "Jeremy Chew" <[EMAIL PROTECTED]>
To: <Discuss-gnuradio@gnu.org>
Cc: "Harry Han" <[EMAIL PROTECTED]>
Sent: Tuesday, April 10, 2007 7:37 PM
Subject: [Discuss-gnuradio] RFX2400 Jamming
Hi,
I am not sure if others like Syed Shah may be having the same problem, but
I notice similar symptoms as he has with my new RFX2400s I got just last
month.
With a spectrum analyser, I notice that with just switching on the
RFX2400, there is continuous radiation from the radio at frequencies I
have set before on the radio. The signals are measured at about -70dB
to -75dB approximately 20-30cm from the transceiver antenna, regardless
whether GNU Radio (GR) software or the PCs are turned on. The noise floor
is -80dB.
Later, when the IP tunneling example is run without MAC, the signal at the
frequency selected for the example, 2.44GHz, goes to noise floor level.
However, once the ping application starts periodic transmissions, the RF
radiation at 2.44GHz rises to about -72dB and remains there continuously,
even after ping or GR are turned off. Not surprisingly, no ping packet
gets through.
This does not happen with the RFX400s I have used. The software is the
same in both cases except for the frequency setting.
I am using GNU Radio 2.8 as I had problems building GR3.0.x. In any case,
my application works with GR2.8 and the RFX400.
Thanks,
Jeremy
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
