Click to See Complete Forum and Search --> : Increased signal but lower speeds, why?


dudemanmax
06-02-2008, 10:57 AM
This link is WDS using Linksys WRT54GL's v1.1 DD-WRT v24 RC-4 (10/10/07) std. Distance is just less than a mile. Clear line of sight.

I was getting 36 - 48mbps (transfer rate on wireless (status page)) with:

signal: -52 to -66
noise: -77 to -80
snr: around 24 to 30
signal quality 50%

While I was getting this, I was using vertical polarization, and the primary router was hooked up to an amp and a four way splitter that split it to three 24dbi grid antennas, and 1 15dbi grid antenna. Then, I changed this to four 24dbi antennas (so that they would all be the same), thicker cable, and shorter runs of cable, and switched to horizontal polarization.

Now I'm getting:

Signal: -47
Noise: -85
Snr: 38
Signal Quality: 58%

Even though these numbers are now significantly improved, and nothing else has changed, we are only getting 18mbps on the transfer rate (as shown on the primary routers wireless status page) with rare jumps to 24mbps.

Why would the transfer rate go down, even though the signal went up? Everything is the same as it was except on the primary router there is now:

A.) Thicker cabling
B.) Shorter cable runs (as much as 5 to 10 meters shorter)
C.) Horizontal Polarization instead of vertical.
D.) I moved the antennas around, they are aiming the same places, and I made sure they were not over lapping but maybe they are too close together, could that give good signal but effect transfer rate?
E.) the cables coming off the spilter are 8 inches longer to accommodate the larger antennas, but the new cable is much thicker than the older one.

Also, the transmission rate is set to auto. Is there any disadvantage to setting it to 54Mbps? It seems like I should address the problem of why it's lower on auto rather than manually change it...?

Any ideas?

Thank you