F-13 qnw wireless routers -

g geleem at bellsouth.net
Sun Aug 8 00:11:12 UTC 2010

On 08/07/2010 08:30 PM, Bob Goodwin wrote:

> G, I have antennas all over, but these two boxes I am messing with have no
> connectors.

hello bob,

no connectors? usb or cheap cards?

some usb wifi have a hidden connector.

i have never seen a wifi card that you could not change antenna or remove
and connect a coax cable. and yes, i know i have not seen all cards. ;)

if cheap cards and you are handy with a soldering iron, cut the antennas
out at mount bracket and solder coax direct to pcb. :)

> Not only that but cable losses are very high at these frequencies and more
> than a few inches of cable will cost you more in loss than you can gain
> with directivity.

yes, the higher the frequency, the greater the loss. but there is 'low loss'
coax for vhf and micro freqs.

do not know off hand, but will have a quick look at belden wire;

selecting 'ecatalog' brings up;

entering 'wireless' in search produces,

double clicking 1st in list of coax cables, 1671a, produces spec sheet;


scrolling down page shows table;

Nom. Attenuation:

Freq. (MHz) Attenuation (dB/100 ft.)
 500          15.0
1000          22.2
2000          32.8
3000          41.2
5000          54.9

which would be 0.549 per foot or, 0.04575 per inch.

i do not know what you consider 'losses are very high at these frequencies',
but i would call it *not much loss*. ;)

i would imagine if i checked specs on some other low loss cables, loss may
very well be less.

if you want to know what they are, have a look. just follow above link.

> 5 gHz probably wants wave guide ...

lower loss, yes. but coax is cheaper. :^P

some more info i found while waiting for your reply;

google, diy "5gh" "wifi+antenna";

diy video;
http://www.5min.com/Tag/wifi antenna?CategoryID=0

diy yagi;


be aware that in all of links i am feeding you, they are all for 'high gain'
directional antennas.

this may not be acceptable. if not, there are also omni directional antennas
that can be use, but they only have 8db to 10db gains.

if you have to have omni direction, i suggest using an inline amp to boost
signal to and from wifi card.



peace out.



in a free world without fences, who needs gates.
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