I am using FLEX2400 d'boards to transmit and receive 802.11b
packets
with codes from bbn and gnuradio_example/python/digital. The problem is
the
d’board is always interferenced by some CISCO access pointed and other
wireless cards located right outside of my lab.
I connect the usrp to my pc with a cable (-30db attenuator
applied). I
hope it receives nothing but packets from my pc. But the d’board can
still
get packets from other wireless card. Then I put the m’b and d’b into
the
black enclosure. Packets still come in. And finally, I put everything
(m’b,
d’b, black box, attenuator) in my metal drower. Most packets are
shielded
out. Some still can be caputured and demodulated.%-|
why is the d'b able to hear others even when I connect attenuators
black enclosure. Packets still come in. And finally, I put everything (m’b,
d’b, black box, attenuator) in my metal drower. Most packets are shielded
out. Some still can be caputured and demodulated.%-|
why is the d'b able to hear others even when I connect attenuators and
cable to its antenna?
-DX
It might pick it up on the 6V power cable.
You could try putting ferrite beads around the power cable to reduce
this.
It might pick it up on the 6V power cable.
You could try putting ferrite beads around the power cable to reduce this.
greetings,
Martin
Thanks for your suggestion. I removed a ferrite bead from my USB cable
and
put it on the power cable. Tested it again. The interference was still
there.
I suspect the interference goes to the d’b directly, becasue when I use
the
enclosure and metal box to cover the d’b, the interference decreases
dramatically. But those cannot reduce the interference low enough for
our
test. Maybe we just need a M1A1 tank.