W1RFI
join:2003-05-12
Burlington, CT
| reply to rf_engineer
Re: DS2 200 Mbps BPL tech is working with ARRL Laboratory !!!
The Motorola system at ARRL HQ was also tested for ingress. The system had been installed at W1AW, the bulletin station at ARRL HQ in Newington, CT. The station operates simultaneously on 7 bands in the frequency range BPL uses, at a power level of 1500 watts on each band. The BPL system was installed in a test configuration with the wireless link shooting across the parking lot from the ARRL HQ administrative building to the W1AW building located about 300 feet distant. The bulletin-station antennas are clustered around the building, with the closest being the 3.5 MHz dipole that is about 20 feet over the building.
A 240-volt wire was run to one of the W1AW towers, to simulate a typical drop wire from an overhead pole to a premise. The Motorola BPL system was operated on the 120-volt wiring inside W1AW. Most of the building uses conduit, so separate plastic-sheathed "Romex" style wiring was run from the demark point to locations on the first and second floors of the building.
I was testing the sytsem with the Motorola engineer at the time the bulletins came on. The system data rate was not significantly slowed down from on/off-keyed CW, single-sideband or data transmissions. My conclusion was that the hardware filters provided significant rejection of nearby radiated signals.
Ed Hare
ARRL Laboratory Manager
225 Main St
Newington, CT 06111
Tel: 860-594-0318
Email: W1RFI@arrl.org
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