OT: Re: [lug] cheap 802.11b for linux...

[Nate Duehr]

Couple of thoughts.

You can't use RG-6.  It's 75 ohm impedance.

RG-213 is double-shielded, which is where it gets its lower loss from, 
kinda a pain to crimp together properly, but works.


Experimentation with this is good, you'll find a combination of good 
connectors that connect nicely to your favorite brand of coax.  Not all 
the good stuff is listed there on those pages either.  LMR400 is 
excellent and not listed, and there are others.  Some are more plentiful 
and actually cheaper in small quantities than others.

Look carefully at the sizes also, you'll be surprised at the diameter 
size differences available.  Typically bigger *usually* means lower loss 
because as you move toward "hardline" you move more and more toward air 
as the dielectric.  The other post from Dan did a good job of explaining 
that, though.

Waaaaaaaay off topic now, sorry all...

Nate

Rob Nagler wrote:

> Wayde writes:
> 
>>http://www.radiobooks.com/products/techinfo/coaxloss.htm
>>http://rf.rfglobalnet.com/library/ApplicationNotes/files/2/times.app.txt.htm
>>http://www.amsat.org/amsat/articles/houston-net/coax.html
>>http://rf.rfglobalnet.com/library/ApplicationNotes/categories/2.htm
>>
> 
> This has great information.  There is a practical issue.  I have
> RP-TNCs and Ns for RG-58.  If I were to, say, go to RG-6, I'd probably
> need a new die and new connectors.  The cost is $100 for the
> connectors at a minimum (min order from pasternak unless others have
> recommendations for RP connectors).  If I am going to spend $100, I
> might as well get good cable.  The problem is getting an RP-TNC to
> match the cable spec.  I've got the following choices: RG8, RG9,
> RG213, RG214, RG225 & RG393.  There are some others, but they appear
> to be thinner, e.g. RG55, RG141, RG142, RG223 & RG400.
> 
> The coaxloss.htm lists RG-213, which I assume is what I should go for
> (~8db at 1Ghz).  I assume crimp is better than clamp(?).  And that
> RG6, RG11, or the Belkin RF99xx cables don't match any of the
> above(?).
> 
> Make sense?
> 
> Rob
> 
> 
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