In reply to:The GTX 330 does not display primary targets (skin reflections). The GTX 330 has the capability to display primary radar targets but the FAA software isn't current enough to allow the data to be placed on the Mode S data link. That could change over a period of time. Aircraft operating without a transponder or a transponder that isn't correctly aligned will not be displayed on the Garmin display.
In reply to:Yeah, what's up with that, eh? Any idea what "correctly aligned" transponder means?
In reply to:Skywatch is most helpful to me in flying into uncontrolled fields. You still have to look for traffic (like those Piper Cubs with no radios or transponders) but those plane are slow moving and hopefully we have time to react when we see them. Skywatch is great to keep an eye out for those Citation type guys who like to make straight in approaches at uncontrolled fields without proper radio contact.
In reply to:I totally agree. Particularly helpful for sorting out 'surprise' radio traffic, like someone who pops on with a vague initial "downwind" radio call when you are a mile out on a 45 entry. It's surprising how many people can be in the airport area, transponder on, who are not making adequate (or any) radio calls. There are a lot more people with transponders on that aren't talking than non-transponder types that aren't squawking...I "see" a lot more traffic than before.
In reply to:I'm curious what the update delay is on the 330 (from the reply at the target aircraft, until it displays on your Garmin 330)... do you know what the spec is on this?
In reply to:I think the "correctly aligned" point is that with both transponders, depending on the angle of the signals sometimes the aircraft actually shields the signal being transmitted.
In reply to:The simple answer to your question is ~4.5 - 9 seconds, which is predicated on the rotation rate of the radar antenna. This is also why TIS (and therefore traffic info) is not available through Center radar, since those antennas only rotate every 12 seconds and the FAA deemed that update rate too slow for traffic alert purposes. (I agree with that.)
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