From Dick's Gadget Warehouse: The Long Range Cordless Phone With “A Five Mile Range”.
September 2, 2010 2 Comments Dick’s Gadget Warehouse Friday, September 3rd, 2010, Netcast 1170
This gizmo won a CES Innovations Award back in 1999. The EnGenius SN-900 900MHz Ultra Long Range Cordless Phone and Two Way Radio claimed a range up to Five Miles (8km) in open terrain for both the telephone and the two-way radio. A big selling point for business was Digital Security Hopping. Using military designed technology this phone was said frequency hop more than 200 times per second for complete privacy. The thing I was most interested in was the range. Again, here’s what the company said: The EnGenius SN 900 Ultra has a range in excess of 5.5 miles. Wyle Laboratories Inc, an independent testing laboratory, in an open field environment, tested the product. The phone operated at up to 630 milliwatts. Most 900-megahertz digital cordless phones transmit at no more than 100 milliwatts; 2.4-gigihertz phones transmit at 260 milliwatts; and family-radio service phones at 500 milliwatts. The place I wanted to use this cordless phone met their criterion for open field environment. I was hoping to be able to talk from the handset from a marina across the river from my houseboat where the base unit was. The distance was about 4 miles, but all outdoors with no obstructions. I did the test by making a call the EnGenius SN-900 while I slowly motored away from my marina in an open boat. I lost the signal when I was about 1.5 miles away. I decided to add an outdoor antenna on a pole to the houseboat base station. That increased the distance a bit more, to about 2 miles. So it seemed at least to me that 5 miles was a bit optimistic, but the phone did offer the longest range of any cordless phones I had ever used. Pitched mainly at business customers, the phones were expensive. About $500 each! EnGenius is still in business producing long-range cordless phones, but they now claim the range is 3,000 acres of property, open land coverage. And they cost about $500.
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