I’ve been waiting for the opportunity to blog about La Fontenna since Martin’s video blog where he demonstrates it in conjuction with a La Fonera and an 802.11n router he has in his office.
After the excitement left me, I realized that Martin was not actually performing a real test of his antenna, he was merely pointing out the window and making speculations. He fails to mention that any laptop hundreds of feet, to 1.5 miles away, would need to be along the beam of his fontenna, at the same elevation, and need a similar antenna to transmit back. Also, the buildings in his area would probably cause a problem due to the Fresnel Effect.
Here are the range of hotspots which Martin Varsavsky describes in his video blog. Martin also doesn’t make it clear that La Fontenna is highly directional. If one did not know this, they would think he was describing gigantic *circular* hotspots!
I recieved my promo code for a $2 (+ $5 shipping!) La Fontenna in an email from Fon on June 12. I thought about it for a couple of days, and then ordered it the evening of Thursday, June 14. My La Fontenna arrived by FedEx on the afternoon of June 21, exactly a week later! Not bad at all. It appeared to be shipped from the same outsourcer in Libertyville, IL who shipped my La Fonera.
I had been concerned that my Fontenna might be lost, since the invoice emailed to me showed the wrong zipcode. Fon’s Shop displayed my name and address when I ordered, and asked that I verify or update it, and I did. These corrections were NOT carried forward to the order I was actually making! Fon does not include the shipment tracking number with the invoice, so I opened a ticket on Fon’s HELP page for customer support.
Suprisingly (heh), I did not recieve a response within 24 hours, as Fon promises. Five days later, on June 20, a Fon representative responded with my tracking number and advised me that *I* needed to contact FedEx to resolve the problem. The tracking number was appreciated, and I could see that my package was on it’s way. But when I called FedEx, they told me that it is the *sender* who is the only one who they could accept an address correction from. Fon needs to update their procedures, and contact Brightstar US, Inc. directly, and then send the customer a resolution notice!
About the Tests
For each of 6 tests, I kept my laptop in exactly the same positon on my front porch, in exactly the same orientation. I was careful to avoid coming too close to it, or to stand between it and the La Fonera. I chose to move the Fon hotspot instead of my laptop because the object was to see how well my personal experience benefeited. This is where my laptop would usually be. My laptop runs Windows XP SP2, and my wifi card is a Proxim Orinoco Gold ABG PCMCIA card, which has a reputation for providing particuarly accurate signal strength measurements.
Admittedly, this was not a truely scientific test. I didn’t try a multitude of positions or use professional testing instruments. I attempted to make it as “real life” as possible. I do think my tests were very reasonable, given the fact that there were probably fewer obstacles for the wifi signal than average at my house.
When attaching the reflector and La Fontenna, I made certain they were pointed directly toward my laptop. La Fonera’s stock dipole antenna was carefully positioned fully-extended and upright. The stock antenna creates a torus (doughnut) shaped pattern, with the antenna in the center. The reflector focuses half of this torus in one direction, producing a sort of teardrop shape, and the Fontenna is supposed to create a large circular lobe with the antenna at one edge, and a much smaller lobe produced just behind it.
La Fontenna Technical Specifications
From Fon’s online shop:
Frequency Range: 2400 MHz 2500 MHz
Antenna gain-without cable: 7 dBi
Antenna gain-with cable: 6.5 dBi
VSWR 2.0: 1 Max.
Polarization: Linear, vertical
Impedance: 50 O
Temperature: -10 C to +55 C
Connector: R/P SMA PLUG
Cable: ULA168,L = 3M
For this test, my La Fonera was inside the house, near the opposite corner from the porch where my laptop was placed. It hung 6 feet (just under 2 meters) above the floor. The house is wood-frame, and the only obstacle of any note is the stove in the kitchen, which may cause a slight Fresnel Effect on the wifi signal. The signal passed through my bedroom door, the central wall, and the kitchen window behind my seat on the porch.
In the NetStumbler screen shots below, the “A” section is the signal using La Fonera’s stock 3-4db antenna, “B” is the stock antenna enchanced with a single “Windsurfer” reflector, like I have blogged about before, and “C” is using La Fontenna.
The signal seemed strong at first, then dropped 8db for some reason. This also occurred with my neighbor’s wifi signal on the same channel at the same time. I was unable to convince La Fonera to change channels (my Linksys was unaffected on ch 6), and subsequent tests showed even poorer reception. My guess is that something nearby had cooincidently just begun to generate interference, and continued until I was out of time to perform new tests.
The result is that indoors, La Fontenna performs somewhat better than the stock dipole antenna, but only slightly better than the reflector, and seems to suffer more “dropouts”.
There is an empty lot across from my house, and since I use an electric mower and trimmer, I chose to run an extension cord across the street and all the way to the rear of the property. This was about 120 feet (36 meters). The La Fonera and La Fontenna were suspended 8 feet (2.5 meters) in the air, in direct line-of-sight of my laptop.
I performed the same three tests. The result is that outdoors, La Fontenna performs noticably better than the stock dipole antenna, but worse than the reflector, and also suffered more dropouts.
I was sincerely disappointed in the results I got. Either I have a defective Fontenna, or there is considerably more than .5db of loss in that 3 meter antenna lead!
Perhaps La Fontenna was worth $7 to me, since I was looking forward to performing these geeky tests, and blogging about it for other’s benefeit. But it performed only marginally better than the Windsurfer reflector I built, which cost me nothing at all. I honestly would not recommend paying $19.95 (plus $5 shipping) for it, but I might pay an extra $2 for it with the purchase of a new La Fonera, as offered in Fon’s Shop, in case it solves some kind of installation problem.
I urge Fon to retire this flaccid device, and instead offer a $19.95 kit comprising a waterproof case to mount the La Fonera into, with an embedded flat-panel antenna on a *short* cable, and a built-in Power over Ethernet (PoE) adapter, so that La Fonera’s 5v DC and network connection can be sent together down a long Ethernet cable. We can buy 100 foot Ethernet cables here for the same price as La Fontenna, which is both cheaper and more flexible than 100 feet of antenna cable. With such a kit, we would not need to worry about running AC power to within 3m of the access point, and where to stash the AC/DC adapter.
If anyone would like to discuss my tests, or even suggest some additional ones, please comment below!
Addition: Check out Marshall’s blog for a La Fontenna unboxing!