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#11
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Transponder: Mode-C or Mode-S?
Hi Morteza I have the Trig21. Installed myself in my experimental to replace a Terra250. Had no problem to get it signed-off at standard price at Precision Static in Livermore. Very happy with it. Reno sees it very well, even at 18k. No issue with the output power. When the PowerFlarm arrives, I suspect that suddenly there will be a miraculous unexplained wire in my harness. I guess that wire will be carrying 19200 baud NMEA sentences from the PowerFlarm to the Trig21 and the Trig will be squittering 1080ES ADS-B Out after someone accidentally toggled the setting in the setup menu to enable this feature. Of course I have nothing to do with this. I will stay legal. I got a good price from Tim M. Better then mentioned above. You can see my installation he https://sites.google.com/site/threeu...21-transponder Or you can have a look at my ship at Tahoe (or soon down the hill) 3U |
#12
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Transponder: Mode-C or Mode-S?
On 9/12/11 6:43 PM, weersch wrote:
Hi Morteza I have the Trig21. Installed myself in my experimental to replace a Terra250. Had no problem to get it signed-off at standard price at Precision Static in Livermore. Very happy with it. Reno sees it very well, even at 18k. No issue with the output power. When the PowerFlarm arrives, I suspect that suddenly there will be a miraculous unexplained wire in my harness. I guess that wire will be carrying 19200 baud NMEA sentences from the PowerFlarm to the Trig21 and the Trig will be squittering 1080ES ADS-B Out after someone accidentally toggled the setting in the setup menu to enable this feature. Of course I have nothing to do with this. I will stay legal. I got a good price from Tim M. Better then mentioned above. You can see my installation he https://sites.google.com/site/threeu...21-transponder Or you can have a look at my ship at Tahoe (or soon down the hill) 3U OK I think you fall into the "technically competent" subcategory (even with the 1080ES typo) :-) Darryl |
#13
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Transponder: Mode-C or Mode-S?
Thanks everyone for the feedback. I am convinced (again) that TT21 is
the best option. I will make sure I build the harness with the wires for the GPS input and ADS-B out just in case. I will order one along with the L2 antenna. I had great success with it in the previous installation and they are so easy to install pretty much anywhere. Now if I figure out what to do with the flight computer, I am all set for redoing the panel layout and getting to work Cheers, Morteza |
#14
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Transponder: Mode-C or Mode-S?
OK I think you fall into the "technically competent" subcategory (even with the 1080ES typo) :-) Darryl Thanks Darryl for my induction in your hall of "technically competent". I feel honored. Yeah, doing too much 1080P work and not enough 1090ES. 3U |
#15
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Transponder: Mode-C or Mode-S?
On Sep 12, 11:55*pm, John Smith wrote:
Just be aware that the TT21 is a class 2 tansponder, i.e. not certified for use above 15,000 feet, and therefore not suited for gliders. Buy the TT22 instead which is class 1. To date I've had 392 flights in gliders. I flew above 15,000 ft on a flight on 17 Jan 1995 (in fact to 19,000 or so). That's the ONLY time. Most flights here don't go much above 5000 or 6000 ft. Even when there's wave it's unusual to be able to get higher than maybe 12,000. Your conditions are not the same as everyone's. |
#16
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Transponder: Mode-C or Mode-S?
On Sep 12, 11:17*pm, Bruce Hoult wrote:
On Sep 12, 11:55*pm, John Smith wrote: Just be aware that the TT21 is a class 2 tansponder, i.e. not certified for use above 15,000 feet, and therefore not suited for gliders. Buy the TT22 instead which is class 1. To date I've had 392 flights in gliders. I flew above 15,000 ft on a flight on 17 Jan 1995 (in fact to 19,000 or so). That's the ONLY time. Most flights here don't go much above 5000 or 6000 ft. Even when there's wave it's unusual to be able to get higher than maybe 12,000. Your conditions are not the same as everyone's. I know what you mean. I had never gotten higher than 6K until I moved to CA and started flying in the Sierras! Around here flying over 15K is pretty routine. However, in my last glider I had a Becker 4401 which is also class 2 and I never had a problem. As a matter of fact out of all the gliders in the Sierras, I would bet majority are using class 2 transponders. Cheers, Morteza |
#17
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Transponder: Mode-C or Mode-S?
On Sep 12, 6:57*am, Darryl Ramm wrote:
John Smith wrote: Darryl Ramm wrote: The TT-21 as a Transponder utterly blows away any other transponder available in the USA for use in gliders. Just be aware that the TT21 is a class 2 tansponder, i.e. not certified for use above 15,000 feet, and therefore not suited for gliders. Buy the TT22 instead which is class 1. This has been discussed here a lot before. the *power difference will make no practical difference. By all means pay slightly more and install the TT22 but the important thing is for folks that fly in busy airspace near airliners etc. to have a transponder (and even an older Mode C transponder works fine fir that). Most transponders installed in gliders in the USA appear to be class 2. Darryl The TT22 draws about 20 percent more power when transmitting than the TT21. It's not a lot, but with PowerFlarm going in to my panel as well I will end up with a 1.5 amp total current requirement, so I figure every milliamp is worth saving. It seems odd to me that Trig didn't design with the Class A floor as the break point between design specs. Then again... 9B |
#18
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Transponder: Mode-C or Mode-S?
When the panel became a power hog, Rex Mayes installed a 2-panel
Strobl Solar system. On blue days it produces almost half the required current, a decent battery extender. But not very efficient under clouds. Jim On Sep 13, 1:24*am, Andy wrote: The TT22 draws about 20 percent more power when transmitting than the TT21. It's not a lot, but with PowerFlarm going in to my panel as well I will end up with a 1.5 amp total current requirement, so I figure every milliamp is worth saving. It seems odd to me that Trig didn't design with the Class A floor as the break point between design specs. *Then again... 9B |
#19
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Transponder: Mode-C or Mode-S?
Hi Gang
I had a Trig mode S transponder installed in my new Phoenix motor glider. It appears to work fine as a mode C transponder. After questioning NorCal while soaring they confirmed they could detect it with their sqwark code, it would IDENT and so on - all the mode C stuff. However most of the US including northern California/Nevada is not yet set up for mode S so except for the future there is no reason to have mode S in the US. Of course there are other reasons to have mode S, probably the most important would be if you wanted to sell a glider in Europe where mode S is becoming mandatory. For that market having a mode S transponder will save the buyer about $2,500 - the cost of replacing a mode C with a mode S transponder. Dave |
#20
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Transponder: Mode-C or Mode-S?
Andy wrote:
The TT22 draws about 20 percent more power when transmitting than the TT21. It's not a lot, but with PowerFlarm going in to my panel as well I will end up with a 1.5 amp total current requirement, so I figure every milliamp is worth saving. It seems odd to me that Trig didn't design with the Class A floor as the break point between design specs. Then again... 9B The 15,000 feet "limit" comes from wording in the relevant FAA TSO and ultimately the RTCA standards. That the level was not set to FL180 is kind of unfortunate. And I expect Trig folks would say the same thing. But then this all goes back to days of traveling wave tubes and much different technology and reliability/power output/cooling issues/cost factors. Darryl |
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