Doug, Again from my past life, we investigated all signals that were emitted on 121.5 MHz and the UHF counterpart 243 MHz. If we didn't then we were taking a chance that what ever signal was being heard could be stronger than a real distress signal that was far from the receiver thus being too weak to be heard when something else is there.
As for the fines, we simply turned any culprits over to the FCC, so I have no idea. Josh POWELL, DOUG wrote: > I saw this bit of news cross my desk a couple of weeks ago. I think > Paul Harvey reported it as well. At first I thought it was rather funny > but after further consideration I realized this was something that can > happen to us all. So, I decided to check into 121.5MHz distress signal. > As I expected it is an analog signal but it has a very specific > modulation. The new digital signal system should help considerably and > inadvertent transmissions like this may only be interference. > > But my question is how a TV was able to produce the specific modulation > required for a distress signal. > > Here are the specs: of the 121.5 MHz beacon > > RF Signal Transmitted > Power: 50 - 100 mW PERP > Transmission life: 48 hours > Frequency: 121.5 MHz +/- 6 kHz > Polarization: Linear > > Modulation > Sweep rate: 2 - 4 Hz > Range: 300-1600 Hz (swept at least 700 Hz) > Modulation type: AM > Modulation depth: > 85% > Duty Cycle: 40% > > Source: http://www.cospas-sarsat.org/Beacons/121Bcns.htm > > My suspicion is that the Air Force considers any emission at that > frequency as a possible distress, given the fact that a crash can also > damage a transmitter. > > Does anyone know what is SOP in a situation where a transmitter is > simply emitting a CW signal on that frequency? > > Oh, and by the way, who would be the governing authority to assess the > $10,000 daily fine? > > > Regards to all and may your favorite candidate win the election, > > -doug > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of David Heald > Sent: Monday, November 01, 2004 7:41 AM > To: [email protected] > Subject: The TV That Sent Out a Cry for Help, via Satellite > > Fresh from today's New York Times - our favorite Oregonian emergency > locator tv... :) > > The TV That Sent Out a Cry for Help, via Satellite > By TOM ZELLER Jr. > Pizza ovens, jumbo score boards, Christmas lights and other > appliances have issued emergency distress signals and > brought search and rescue teams running. > > http://www.nytimes.com/2004/11/01/technology/01signal.html?th > > > Have a great week, > -Dave > > > > > > David Heald > EMC Engineer / Worldwide Regulatory > Symbol Technologies > tel: +1.631.738.5373 > fax: +1.631.738.3915 > > Symbol. 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