> I have two XR2 radios close to each other on one PCI board. With this
> setup I am seeing a throughout of 30 Mbps combined from two radios
> (which should be around 60Mbps). If I switch the radios with XR5 I
> seeing 60 Mbps throughput.
> XR2 + XR2 + antennas == 30 Mbps (should be around 60 Mbps)
> XR5 + XR5 + antennas == 60 Mbps
> XR2 + XR2 + cable on radio pair == 60 Mbps.
> Can somebody please suggest some pointers to debug this problem with
> I am using trunk madwifi (r4022) and the interfaces are configured for
> adhoc mode with minstrel rate control algorithm. I suspect
> Any suggestions are welcome.
> > Looks like you already debugged it - you're likely seeing
interference between the two radios, and will need to plan on an
installation with sufficient
> > antenna separation to avoid the problem. Using xr9's, the problem
would be much worse; we plan on a minimum antenna separation of 15 feet
> > doing dual-radio 900 Mhz installations. The lower the frequency, the
greater the required physical separation.
> > Tom S.
Thank-you Tom for your response. We separated the two antennas today
with a separation of about 15ft but still see a performance of only
around 22 Mbps combined from two radios. What performance did you see in
your setup with dual radios. What performance improvement can I expect
to get when I move from one radio on a board to two radios on a board.
Lastly I suspect there might be interference on our host board itself.
Is there a recommendation to try the same setup (dual XR2
radios+madwifi+adhoc) to get a better (30Mbps +) performance ?