: Re-use an old Look-TV Antenna for WiFi ?
2010-08-20, 01:20 PM
Sorry for being slightly off topic, but...
It's been mentioned in the past that those old Look-TV antennas cannot be used for OTA, which is understandable.
However, I was looking to build a WiFi biquad dish antenna (http://www.engadget.com/2005/11/15/how-to-build-a-wifi-biquad-dish-antenna/) to enhance my wireless signal, when I realized that I still had an old Look TV antenna. I understand that Look TV broadcasted in the 2.5 - 2.7 GHz range. Would this be a suitable antenna for standard WiFi ?
2010-08-20, 03:01 PM
Wifi b/g is 2.4 ghz, so yes.
Whats the distance youre looking for ?
2010-08-20, 03:35 PM
About 350 meters with obstructions. Not sure if this is really possible, but I've read about some folks getting wifi signals over a few miles with the biquads.
2010-08-20, 04:54 PM
i can't wait to see the results as i have one kicking around mom and dads
2010-08-20, 07:18 PM
About 350 meters with obstructions.
350 meters isnt a problem with higher gain antennas, but the obstructions are. You really need a clean line of sight for wifi distance.
237 miles is the distance record, but you need to be on the peaks of an Andes mountain range, heh.
2010-08-21, 09:22 PM
How would you attach a wifi antenna to your laptop/desktop?
2010-08-21, 11:25 PM
Some wireless routers have an external antenna connector.
2010-08-22, 12:01 AM
One way is to use a wireless network card that has a detachable SMA type small whip antenna. Then use low loss 50 ohm cable with the proper SMA connectors. Thats what I used on my wifi biquad. The low loss cable still has a lot of loss, so youre limited to about 10 ft max cable distance, without some kind of repeater.
Another option is to use a weatherproofed usb b/g adapter for the antenna element and a usb extention cable.
2010-08-22, 01:29 PM
Yep, don't go using 75Ω coax, it has to be 50Ω.
I needed some 50Ω coax in a hurry once to fix a 2-way radio so I stopped into a big box store's automotive department, bought a replacement AM/FM car antenna, sheared off the Motorola connector, cut the remaining 3 feet of cable off the antenna and soldered the right connectors on, all for about $7. Worked perfectly. :) Some stores have an extension cable for car antennas which would do even better.
2010-08-22, 08:22 PM
Cool, I actually have an MN-730 I'm not using that has a detachable whip antenna (just unscrewed it!), and, a couple USB b/g adapters too.
What would the approx limit be using a USB extender cable on with the USB wireless thingys?
EDIT: No antenna jack on the router - I gues that just would have made too much sense.
2010-08-22, 09:24 PM
Q1: How long of a cable can I use to connect my device?
A1: In practice, the USB specification limits the length of a cable between full speed devices to 5 meters (a little under 16 feet 5 inches). For a low speed device the limit is 3 meters (9 feet 10 inches).
So, with 15 feet to a powered hub, and another 15 feet to the usb b/g adapter, about 30 feet.
2010-08-23, 05:19 PM
I just built a mini-reflector for my router out of tin foil :)
Will see if it improves the situation in my bedroom any. I mean the reception of course ;)
2010-08-24, 04:27 PM
It helps a lot!! I'm going to make a better one, more shaped to my situation.