need 2c on wifi setup .

[[OUPA]MrNutz]

i've got 2 client points A and C - with high site B.


a= pc->RJ45->WRT54GL(ddwrtsp2(100Tx Power))->4m lmr400->16dbi poynting sector

clear LOS A to B
2km A to B

b= 1x 16dbi poynting sector->2m lmr400->WRT54GL(ddwrt54GL(ddwrtsp2(100TXpower))

clear LOS B to C
2.5km B to C

c= pc->RJ45->WRT54GL(ddwrtsp2(100Tx Power))->3m lmr400->16dbi poynting sector


now:

giving a small budget - how can we improve this setup - for performance sake?

-SNR from B-A = 26
-SNR from C-B = 21

copy speed varies between 600-900KB/sec - with minimal packetloss.

any ideas? (no experience with routerboards) - but would like to get transfer rate as fast as possible

many thx

 

[[OUPA]MrNutz]

must just add - we are currently set to G only mode at fixed 36mips speed

if we set it to 11megabits B only or even G - speed drops to sub 200KBPS.

have also played around with channels - 1,6,11,14 - best giving chan 6.


any tips?

 

[skydog]

try changing the timing of the WRTs
i personally would have used grids rather then sectors at the "client" sides

AP B is your bottle neck if you are using the same radio transferring from A to C. if you want more speed then you will have to put 2 radios at your AP B

 

[[OUPA]MrNutz]

timing as in Sensitivity range (ack timing)? -

i did set it to 0 instead of the default values before..

dunno really what to set it at

didn't see much a diff yet

 

[Trybble]

If I remember correctly, 36mbps is the total max speed over-the-air. Guesstimate that down to 18mbps per node in a two-node setup, 9mpbs/node in a 3 node setup. Add to that the hidden-node problem seeing as they're all on the same frequency and 600-900kilobytes/sec doesn't seem to be too bad. Don't shoot me on that - memory ain't what it used to be. 2 radios at the high site on different channels would definitely speed things up, though.

As far as the installation is concerned, 100mW TX with a 16dBi antenna, factoring in 0.8dB loss on the 4 metres of LMR400, gives an EIRP of approximately 3.3 watts. Way over the legal limit.

*Trybble