Helmut Wabnig wrote:
On 22 Aug 2006 11:39:54 -0700, wrote:

Hi,

First off let me state that I'm a newbie in RF hardware so my apologies
if this is a dumb question. For an experiment I'm conducting I want to
be able to transmit two data streams from two WiFi(b) routers at the
same time. I realize that they have carrier sense avoidance so that if
they are right next to each other they will not transmit at the same
time. Is there a piece of hardware (filter, diode? or something?) that
i can put between the output of the routers and their respective
antennas such that this device will pass the transmit signal to the
antenna but not pass any radiation received from the antenna to the
routers? The idea then would be that the carrier sense would not come
into play as no power would be received from the antennas. Any ideas
or suggestions would be greatly appreciated. Thanks,

Kev
A circulator would do the trick.

http://www.ditom.com/microwave-circulator.htm

https://ewhdbks.mugu.navy.mil/circulat.htm

Rather expensive, sometimes to be found on Ebay.

w.

Thanks for the suggestion, a circulator/isolator is what i need. If
anyone has any suggestions on a bargain vendor I'd appreciate it.

Also as a follow up does anyone have a sense as to what the default
carrier sense power threshold is on WiFi routers in dBm? I've seen a
few isolators so far that range from 20dB to 40dB isolation, my router
puts out 20dBm so it would be good to know if one isolator will do the
trick. Thanks again.

Kev