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In article
, john smith wrote: The really dumb part of that requirement is that terminal radar doesn't see below a given altitude at a given distance. but a TCAS II equipped aircraft can see you. -- Bob Noel Looking for a sig the lawyers will hate |
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![]() "Bob Noel" wrote in message ... but a TCAS II equipped aircraft can see you. ...which gives you plenty of reason to leave the thing on. In fact, it is reason enough that significant numbers of glider people are installing some of the new low-drain units, even though there is no FAA requirement. Vaughn |
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: ...which gives you plenty of reason to leave the thing on. In fact, it is
: reason enough that significant numbers of glider people are installing some of : the new low-drain units, even though there is no FAA requirement. My big beef was just the finite lifespan of the old cavity tube units. As long as it's solid state like my new unit, there's really no reason NOT to turn it on. Maybe I was just ultra-sensitive to the cavity thing since I had to replace two of them with low power. The other beef is how vague the FAR is. -Cory -- ************************************************** *********************** * Cory Papenfuss, Ph.D., PPSEL-IA * * Electrical Engineering * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
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In article ,
Bob Noel wrote: In article , john smith wrote: The really dumb part of that requirement is that terminal radar doesn't see below a given altitude at a given distance. but a TCAS II equipped aircraft can see you. Only if you have a Mode-S transponder. |
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![]() john smith wrote: but a TCAS II equipped aircraft can see you. Only if you have a Mode-S transponder. Nope, all they need is mode C. |
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![]() wrote: john smith wrote: but a TCAS II equipped aircraft can see you. Only if you have a Mode-S transponder. Nope, all they need is mode C. Actually, they don't even need mode C, now that I think about it. You get different levels of service depending on what the target has. If they've got Mode A you'll get an callout. If they've got Mode C then you'll get an RA (climb / descend) If they've got Mode S and they've also got TCAS, the two TCAS's will boogie with each other to coordinate the RA. So really mode S by itself does nothing for TCAS II unless you've also got a TCAS as well. |
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![]() john smith wrote: My understanding is that the Mode-S provides the communication information. Mode C may contain altitude, but there is no distance or direction information. Mode S doesn't provide any distance or direction info to another TCAS. Each TCAS figures that stuff out on its own. |
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