Cable compatibility with Antenna

Hi:
Is there an antenna (2.4GHz) which uses a Cat5 cable which is inexpensive -
Where? and is there an advantage with 100' of cable between LMR400 and Cat5?
Thanks

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Message posted via HWKB.com
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"Regent via HWKB.com" <u31454@uwe> hath wroth:

>Is there an antenna (2.4GHz) which uses a Cat5 cable which is inexpensive -

No. Antennas use coaxial cable, not twisted pair.

>Where? and is there an advantage with 100' of cable between LMR400 and Cat5?

Yes. LMR400 has a loss of 6.7dB/100ft. That means if you shove your
transmit power into one end of the 100ft coax cable, you'll get about
1/4th of the power out the other end. Same with the receiver
sensitivity in the other direction.

CAT5e cable is only rated to 350Mhz where the loss is about
15dB/100ft. Extrapolating to 2.4GHz, CAT5e would have a loss of about
100dB/100ft which means you'll lose almost all your power in the CAT5e
cable. You'll also have to match the 100 ohm CAT5e impedance with the
50 ohms of the access point and antenna.

Bad idea. Forget it.

--
Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

On Wed, 07 Feb 2007 05:39:47 GMT, "Regent via HWKB.com" <u31454@uwe>
wrote:

>Is there an antenna (2.4GHz) which uses a Cat5 cable which is inexpensive -
>Where? and is there an advantage with 100' of cable between LMR400 and Cat5?
>Thanks

You are really talking about two totally different things here -
apples and oranges so to speak.

LMR400 is low loss coaxial cable designed to transmit microwave radio
signals.

Cat5 is multiple twisted pairs designed to transmit ethernet data
signals.

LMR400 is good cable but a 100 foot run will still introduce a lot of
loss (over 6 db as Jeff pointed out).

The way to avoid that loss is to use an outdoor/weatherproof access
point (or bridge depending on your requirement) close to the antenna.

Then, and only then, you can use cat5 cable to bring the ethernet
signals the rest of the way.

Wayne.B <waynebatrecdotboats@hotmail.com> wrote in
news:knjjs25iokkcjn8bsb1t852sg5ggdgl1s6@4ax.com:

> On Wed, 07 Feb 2007 05:39:47 GMT, "Regent via HWKB.com" <u31454@uwe>
> wrote:
>
>>Is there an antenna (2.4GHz) which uses a Cat5 cable which is
>>inexpensive - Where? and is there an advantage with 100' of cable
>>between LMR400 and Cat5? Thanks
>
> You are really talking about two totally different things here -
> apples and oranges so to speak.
>
> LMR400 is low loss coaxial cable designed to transmit microwave radio
> signals.
>
> Cat5 is multiple twisted pairs designed to transmit ethernet data
> signals.
>
> LMR400 is good cable but a 100 foot run will still introduce a lot of
> loss (over 6 db as Jeff pointed out).
>
> The way to avoid that loss is to use an outdoor/weatherproof access
> point (or bridge depending on your requirement) close to the antenna.
>
> Then, and only then, you can use cat5 cable to bring the ethernet
> signals the rest of the way.
>
>

Which is what this poster has been told several times already in previous
threads on the same subject.

On Wed, 07 Feb 2007 05:39:47 GMT, "Regent via HWKB.com" <u31454@uwe>
wrote in <6d6f4961b99d8@uwe>:

>Is there an antenna (2.4GHz) which uses a Cat5 cable which is inexpensive -
>...

No, not at any price. To use CAT5 cable, you'll need to put your radio
at the (far) end of the cable, probably powered by PoE (Power over
Ethernet).

--
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DanS wrote:
> Which is what this poster has been told several times already in previous
> threads on the same subject.

[snip mode one]

--[Originally from 2/3/2007 3:01 PM]
Regent wrote:
> Hi Guys (and Gals)
> Can a Cushcraft Pc2415 Antenna be converted from COAX to Cat5? I have
> purchased a used one and have no documentation at all. If it can be, how?

--[And then on 2/4/2007 4:53 PM]
Regent via HWKB.com wrote:
> Thanks,
> I believe I now have enough info to proceed.
> D


--[And asking for more help on 2/6/2007 11:39 PM]
Hi:
Is there an antenna (2.4GHz) which uses a Cat5 cable which is inexpensive -
Where? and is there an advantage with 100' of cable between LMR400 and Cat5?
Thanks

[snip mode off]


Apparently not...("have enough info to proceed")

decaturtxcowboy wrote:
>> Which is what this poster has been told several times already in previous
>> threads on the same subject.
>
>[snip mode one]
>
>--[Originally from 2/3/2007 3:01 PM]
>Regent wrote:
> > Hi Guys (and Gals)
> > Can a Cushcraft Pc2415 Antenna be converted from COAX to Cat5? I have
> > purchased a used one and have no documentation at all. If it can be, how?
>
>--[And then on 2/4/2007 4:53 PM]
>Regent via HWKB.com wrote:

Thank you all for your clear in;ut - Per DanS' comment, I appreciate your
comment, too, but there was so much seemingly contradictory info, I needed to
clarify my question and now have definitive answers.
Thanks all.
> > Thanks,
> > I believe I now have enough info to proceed.
> > D
>
>--[And asking for more help on 2/6/2007 11:39 PM]
>Hi:
>Is there an antenna (2.4GHz) which uses a Cat5 cable which is inexpensive -
>Where? and is there an advantage with 100' of cable between LMR400 and Cat5?
>Thanks
>
>[snip mode off]
>
>Apparently not...("have enough info to proceed")

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On Wed, 07 Feb 2007 18:09:22 GMT, John Navas
<spamfilter1@navasgroup.com> wrote:

>No, not at any price. To use CAT5 cable, you'll need to put your radio
>at the (far) end of the cable, probably powered by PoE (Power over
>Ethernet).

Exactly. This is how my Senao 3220 works and it comes with POE as
standard equipment:

http://pnt.zoovy.com/product/NOC-3220-EXT

I can now recommend it since I got mine working... :-)