Re: [Discuss-gnuradio] Shielding on 2.4GHz

[Martin Dvh]

DiX wrote:
> Hi everyone,
> 
>      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 points 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 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.

greetings,
Martin