Re: [Discuss-gnuradio] Shielding on 2.4GHz
Martin Dvh wrote: 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. Best -DX -- View this message in context: http://www.nabble.com/Shielding-on-2.4GHz-tp15072399p15207372.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Shielding on 2.4GHz
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 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Shielding on 2.4GHz
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 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 and cable to its antenna? -DX -- View this message in context: http://www.nabble.com/Shielding-on-2.4GHz-tp15072399p15072399.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
