[MLB-WIRELESS] Galaxy antennaes - RF cable question

[Jon Teh]

On Mon, Aug 12, 2002 at 05:06:03PM +1000, Paul van den Bergen wrote:
> Hi all,
> If all goes well I will collect the first of two galaxy antennaes I have 
> my eye on this weekend...  This brings to mind a question.
> 
> there is a chance that I will be able to grab a fair length of the 
> connecting cable from the antennae to the wall socket.  Is this worth my 
> while, or is it crap for our purposes???  (I ask because if it is free 
> and it will do the job, why not grab it?)  if it is not ideal, how bad 
> is it?  since I have 2 650mW old ISA wavelan cards that I want to use (I 
> am still considering my configuration) I would actually welcome some 
> loss in the cables...
> 
> If it is really bad, I'll just cut the wire...
> 
> 
> so, the questions are
> 
> 1)  is the cable from the galaxy antennaes to the wall socket 
> appropriate for 802.11b frequencies? (and incidently, what is it rated for?)
> and
> 2) just how lossy would it be if I did use it?
> which I guess is three questions but what would I know... I'm an 
> engineer... we don't count...
> 

I believe the cable used would probably be 75 Ohm impedence. We want 50 Ohm
for wireless networking. So, an impedence mismatch would occur if you use
the provided coax.

Also, it is very lossy at 2.4Ghz, not worth looking up.


-- Jon Teh

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