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#1
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TCAS or not TCAS?
My 73 T337 G (P model) once had a Ryan 9900BX installed for traffic. A prior owner left the processor in the garage one too many nights and his wife sold it on EBay!
So as I get ready for my avionics upgrade in April, I’m wonderIng if I should find a box and have it reinstalled? It’s already wired for power and antennas and feeds the Garmin 530w. Rest of the story: In order to get ADSB legal, my upgrade transponder was installed early. As I read about the options it has, it looks like the Ryan 9900BX is not needed at all and that the L3 NGT 9000 unit can use the antennas installed and provide active traffic. I might be missing something about this technology, can anyone confirm my suspicion that I’ll have active traffic just like from a Ryan unit? Russ N8CV 
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#2
02-20-20, 08:52 PM
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You will only have active traffic in when in range of ADS-B transmitters. There are vast swathes of the US with no radar coverage and no ADS-B either.
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#3
02-20-20, 10:52 PM
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Quote:
__________________
Herb R Harney 1968 337C Flying the same Skymaster for 47 years
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#4
02-20-20, 11:14 PM
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That depends on at what altitude you are flying. On an approach below 1500 feet you may not have ads-b coverage. I have attached two screenshots from the FAA ADS-B webpage showing coverage at 1500 and 500 feet AGL.
Last edited by Ed Coffman : 02-21-20 at 08:52 AM.
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#5
02-21-20, 11:49 AM
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Ok, I see where you are going with this. I wasn't thinking about the lower altitudes that would be obscured of receiving the 978 UAT transmission. Although it's always nice to be able to know about traffic, the areas that may be obscured are really going to be low volume traffic areas. Most busy traffic locations appear to have coverage. It's easy for me to say as I am now a flatlander pilot and have coverage nearly 100% of my area. Point taken, thanks Ed
__________________
Herb R Harney 1968 337C Flying the same Skymaster for 47 years
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#6
02-21-20, 11:50 AM
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Russ
L3 is local here in GR and I have contacts with some of the folks if you think that would help to answer some questions. Not sure I totally understand what you are asking as I am familiar with the Ryan systems
__________________
Herb R Harney 1968 337C Flying the same Skymaster for 47 years
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