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Due to the sliding canopy it is difficult to directly run a second coaxed cable (needed for Garmin 430 WASS upgrade) from the back top fuselage to the instrument panel. Is it possible to use a signal splitter on the existing coaxed cable I had installed that supplies the Lynx 9000? If possible I want to avoid another hole in the floor under the front seat (as well as the very large installation expense for the cable). Any suggestions on a more direct cable route from the top/back fuselage to the instrument panel?
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I do not know that much about the Lynx transponder or the Garmin 430 WASS, but it is my understanding that you only want one GPS source feeding your ADS-B out and your IFR nav units. With other ADS-B gear, they have the capability to accept GPS data in from an approved GPS navigator like the 430. I would assume that the Lynx would have that capability too. Assuming the GPS antenna installed is compatible (and approved for IFR) with the 430, you should be able to connect that antenna to the 430, then connect the Lynx to the 430 to get the GPS data. Worst case is you might need to change out the antenna to one approved for the 430. Also I think the 430 WASS requires RG400 Coax from the GPS antenna to the 430. That is what most shops are using these days, so if the coax that feeds the Lynx was recently installed by a shop, that is likely what they used. Check with your avionics shop to be sure, but I think you only need one GPS antenna.
Putting a signal splitter on the coax between the GPS antenna I don’t think would be approved. The antenna receives voltage from the GPS receiver to power an internal pre-amp. While a splitter can be made to block the DC voltage from one device allowing it to be powered by the other, I have not heard of a FAA approved device to do that, as well as the signal loss through the splitter might be an issue. -
Richard: I appreciate your very helpful, detailed information. I should have researched this question before I installed the LYNX 9000 to meet the 2020 mandate. I am a VFR pilot with dual 430-straight units. Now that I need to replace an internal battery on one of the 430 units I thought this might be a good opportunity to upgrade one or both units to WASS. The LYNX is ADSB in and out – all I really need for my VFR flying along with the dual 430’s. I am just looking ahead to a possible future sale of the Tiger. Perhaps I will take a reduced price and let the new owner install his/her choice of avionic upgrades. Jim K.
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That would tell me you have multiple GPS antennas on the airplane now. You might have one 430 with an antenna feeding the other 430 with data, and the one that was installed with the LYNX. As I have read in the past, when you upgrade a 430 to WASS, it requires a new antenna and RG-400 cable.
As always, if you are going to keep the airplane for a long period of time, do the avionics that suits your flying and budget. But if you plan to sell soon, you rarely get your money back with installing new avionics beforehand.
Me, I fly with 70’s and 80’s avionics in both my planes. I an just installing the Stratus ESG transponder in my Cessna 182 as the first major upgrade since the Loran-C’s that I installed in this plane (and my Grumman AA-1B) in 1988…
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