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Wireless enthusiasts have been repurposing satellite dishes for a couple years now. This summer the longest link ever was established over 125 miles using old 12 foot and 10 foot satellite dishes. A dish that big is usually overkill for most people and modern mini-dishes work just as well. The dish helps focus the radio waves onto a directional antenna feed.We're building a biquad antenna feed because it offers very good performance and is pretty forgiving when it comes to assembly errors.

Follow along as we assemble the feed,attach it to a DirecTV dish and test out its performance.Why? With just a handful of cheap parts, a salvaged DirecTV dish and a little soldering, we were able to detect access points from over 8 miles away. Using consumer WiFi gear we picked up over 18 APs in an area with only 1 house per square mile.

Building the antenna

Biquad antennas can be built from common materials, which is nice because you don't have to scrounge around for the perfectly-sized soup can. We did have to buy some specialized parts before getting started though.

The most important part here is the small silver panel mount N-connector in the center of the picture; the entire antenna will be built on this. We purchased it from S.M. Electronics,part# 1113-000N331-011.

The "N-connector" is standard across the majority of commercial antennas and you can connect them to your wireless devices using "pigtails." The longer pigtail in the picture is a RP-TNC to N-Male pigtail that we'll use to connect our antenna to a Linksys WRT54G access point. The short pigtail is a RP-MMCX to N-Male pigtail so we can connect to our Sena o 2511CD PLUS EXT2 WiFi card which is pictured.

purchased 10 feet of WBC 400 coax cable so we wouldn't have to sit with the dish in our lap.We got our surplus Direct V dish from Free cycle. We'll cover the reason for the mini butane torch later.Trevor Marshall built one of the first bi quad WiFi antennas found on the internet.

The wire is standard solid-core 3-conductor wire used for most house wiring.We didn't have any copper printed circuit board material laying around sowe used this thin sheet of copper and supported it using the 1/4-inch thick blackplastic pictured.The first step in building the element was stripping and cutting a

244mm length of wire.

We marked the wire every 31mm with a permanent marker and began bending the wire into a double diamond shape.We tried to make the length of each leg 30.5mm.

The easiest way to make really sharp bends in the solid copper wire is to use two pairs of pliers.With the pliers held perpendicular to each other bend the wire against one of the sets of jaws.

The element with all bends completed:

Next we cut out a 110mm square of black plastic to use as a base for the reflector.We drilled a hole in the center to clear our connector.

We then soldered a piece of copper wire to the center pin of our N-connector.

Next we soldered a piece of of wire to the outside of the connector.We ran into some trouble here. Our cheap iron was not capable of getting the connector's base hot enough to make a good solder joint. We bought a butane torch and used that to heat up the surfaces. This worked pretty well except it the soldered our center pin.We recommend you solder the outside piece of wire first before doing the center one.

After the connector had cooled it was attached to the black plastic base using epoxy.The thin copper sheet was attached to the front with epoxy and trimmed to fit.We let the epoxy cure for a while before proceeding.

The next step was to solder our bow tie shaped element to the vertical wires.The element was supported by two pieces of scrap copper trimmed to 15mm to ensure proper positioning.

Then the extra wire was trimmed off and the outside wire was soldered to the ground plane to complete the antenna.

To make mounting to the dish easy we modified the original feed horn. Here is what it originally looked like.

After removing the housing, internal components and shortening the feed horn looked like this.

The antenna is attached by inserting the N-connector into the tube and then connecting the coax cable.

Here is a picture of the final antenna assembly ready to be attached to the dish.

Since the satellite dish has an off-center feed it looks like it is pointed at the ground when it is level with the horizon. Even though there are no angle markings for setting the dish at 0 degrees inclination we can still ensure that the dish is pointing at the horizon by setting the dish angle to 45 degrees and mounting it on a tube with a 45 degree angle.

Test results

The Engadget Corn Belt Testing Facility has broadband access provided by a local WISP.So we knew if we plugged in our antenna we were sure to pick up something in the area.We pointed the dish at the closest grain elevator, where the WISP mounts their antennas.We connected the dish feed to our Sena o card and started up Kismet.

We expected to get one AP, but five is even better. Looking through the info strings we were able to determine where the APs were since the WISP had named them according to the town they are in. The AP on channel 5 is the one we pointed at in town A,2.4 miles away. The AP on channel 6 is located in town B, 8.2 miles away. The two APs on channel 1 are a bridge between town A and town C which is located 2.6 miles directly behind the dish.Our next test was to hook our WRT54G up to the dish and point it at a hill 1 mile away. We drove to the top of the hill and used an omnidirectional mini whip antenna with our Sena o card to detect it.

Our router was picked up easily. The found 14 other WISP APs including town D,7.8 miles away.The WISP is definitely using some high powered equipment if we're just picking this up with an omnidirectional antenna.For a final test we put the dish on the roof rack and parked on top of the hill to see if we could pick up any more APs.

Our final count is 18 APs, 17 of those belonging to the WISP. This was a pretty fun project and shows that you can build decent wireless solutions using consumer gear.For the curious: The WISP gives its subscribers a patch antenna with a built in power over-Ethernet access point.Once the antenna is mounted to the roof they run a single Ethernet cable into the house which means they don't have to worry about signal loss from coax.

I'm going to show how to up your poor signal strength

CANTENNA

1.Find a can that is about 4 inches wide in diameter and about 6 inches long. You may be able to solder several cans together to meet the length requirements.

Secret Codes For China Mobiles

*### Camera Module not Ready
*#66*# Set Factory Mode CONFIRMED
*#8375# Show Software Version CONFIRMED
*#1234# A2DP ACP Mode CONFIRMED
*#1234# A2DP INT Mode CONFIRMED