Tuesday, May 02, 2006
RFI and EMC Rants
Steve Thomas here. The RFI level at the NAB show last week in Las Vegas was incredible. Just in the North Hall there were over a dozen active 802.11(b) and 802.11(g) signals, plus another 4 or 5 802.11(a) signals. The NAB had several access points themselves. I used one of the 802.11(g) access points when I could. Sometimes I just couldn't stay connected so I had to resort to using my Verizon Wireless 1XEVDO card.
Several transmitter vendors had FM IBOC transmitters on display. IBOC stands for "In-Band On-Channel" which is really somewhat of a misnomer since the signal covers the two adjacent channels. AM IBOC is currently allowed daytime operation only because of the potential of serious interference to adjacent channels hundreds or thousands of miles away due to night time ionospheric propagation.
Several transmitter vendors had FM IBOC transmitters on display. IBOC stands for "In-Band On-Channel" which is really somewhat of a misnomer since the signal covers the two adjacent channels. AM IBOC is currently allowed daytime operation only because of the potential of serious interference to adjacent channels hundreds or thousands of miles away due to night time ionospheric propagation.
