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The Graveyard - Products No Longer Supported => Routers / COVR => DIR-655 => Topic started by: Andji on January 07, 2010, 06:45:37 PM

Title: Antenna Extender
Post by: Andji on January 07, 2010, 06:45:37 PM

im looking into getting this for my dir-655

(http://images.tigerdirect.com/skuimages/large/D700-5554-main.jpg)

but i have this

(http://images17.newegg.com/is/image/newegg/33-124-178-S03?$S640W$)

it was part of my old wireless g adapter... would it work?

Thanks

Title: Re: Antenna Extender
Post by: ddaniel51 on January 08, 2010, 01:06:40 AM

As long as your connectors match it'll work just fine.

40 yrs of comm and IT tech talking. :)

Title: Re: Antenna Extender
Post by: EddieZ on January 08, 2010, 02:17:25 AM

Should work fine. But don't expect too much, it will only extend your choice of location of the antennas.

Title: Re: Antenna Extender
Post by: ozzed3 on January 08, 2010, 02:44:22 AM

So there is no special equipment required for "N" mode.. Someone on D-link support was rambling something about antenna diversity and spatial multiplexing that doesn't exist on "G" antennas, and that I should only buy N antennas.

In my case though I want more coverage horizontally (Antennas with more DB).. My previous understanding was that I would need "N" antennas, but are you saying they are no different from "G" antennas?

Title: Re: Antenna Extender
Post by: lizzi555 on January 08, 2010, 02:50:25 AM

Antennas are optimized for frequencies - and these are the same for g and n.
So you can use the same antennas.

spatial multiplexing and diversity and ... are the reasons why N needs to use more than one antenna.
But it doesn't need different antennas.

But all N antennas on one device should be of the same type. So you will have to replace all 3.

Title: Re: Antenna Extender
Post by: ozzed3 on January 08, 2010, 02:58:06 AM

Nice, thanks :)

Just a completing question.. If I sometime in the future decide to use the antennas for the 5GHZ-band, will I be able to as "G" is only 2.4GHZ?

Title: Re: Antenna Extender
Post by: Andji on January 08, 2010, 08:34:33 AM

thanks, yeah i thought it should just work... but just wanted to double check.

also, im not sure if u can see it or not, but on the linksys antenna picture, there's also a little white plug at the end of the cable.  i believe it's only to supply power to the led that's on the stand, but just to confirm, these antennas shouldn't need power right?

Title: Re: Antenna Extender
Post by: Ronneske on January 08, 2010, 10:12:25 AM

For 5Ghz the antennas will be approx 2x too long.

Formula: 300/Freq in Mhz = wavelength in Meters

300/2400 = ... Meters
300/5000 = ... Meters

Some velocity factor (depending on antenna material/shielding etc, on average 5%) so the theorectial antenna length * 0.95 = the practical antenna wavelength.

normally antenna will be a 1/4 wavelength so devide the above outcome by 4 and you will see the antenna length currently in use.

So based on above you cannot interchange the antennas for mentioned frequencies. At least the result will be far from optimal.

Title: Re: Antenna Extender
Post by: EddieZ on January 08, 2010, 10:36:47 AM

For 5 Ghz N the antennas will not work, they are 2.4 Ghz only.