Re: My external-antenna experiment on a Linksys wap/router failed!

At 09:16 PM 10/29/2003 -0800, you wrote:
>
>On Oct 29, 2003, at 19:50, David Cook wrote:
>
>> I acquired a new Linksys BEFW11S4-V4, and loaded the
>> latest firmware into it (firmware v 1.45.7 ).  I also acquired
>> a 10-foot LMR-195 connecting cable and a HyperGain 10-dBi
>> Omni Antenna.
>
>Goto http://www.timesmicrowave.com/cgi-bin/calculate.pl and plug in the 
>numbers.  10 feet of LMR-195 will give you ~2dB of attenuation at 
>2400Mhz.  With a 10dBi antenna you'll get ~8dBi, probably less if you 
>consider signal loss from the connector.

Some N connector specs I've read show .2 to .3 db loss per connector.  If
you switched to a 1.5ft LMR-195 pigtail and an 8.5ft LMR-400 extension,
assuming .3 db loss per connector, you would have about 2.1 db loss vs 2.6
beforehand.  Calculation based on LMR-195 @ .2db loss/foot, LMR-400 @
.067db loss/foot, .3 db loss per connector.  With more liberal values of
.18, .067, and .2, you'd see 1.6db loss for the link (1.5ft + 8.5ft
extension) vs. 2.2db using only LMR-195.

>What kind of omni is it? Did you play with the position?  Does the 
>antenna have sufficient grounding?

Be aware that high gain omnis 'compress' or 'flatten' the signal 'donut'
that emit, so if you're much above or below them you won't get the best
possible signal.  Also don't try to test it right up next to the AP...leave
several feet spacing.

>I have a 5dBi mag mount antenna from Hyperlink, also using LMR-195.  
>I've found that there is a particular sweet spot on my car's roof that 
>gives me an extra 2dB of signal compared to other mounting locations.  
>Move the antenna around, if its a mag mount try sticking it on 
>something large and metal, see if it changes anything.
>
>-richard
>
>--
>Richard Lotz
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