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Anyone know if these will work with a Mode S transponder?

At Oshkosh this year, I dropped by the Bendix-King booth and learned that they are selling new fronts for the King 155 and 165 radios. The new fronts include new LCD or LED displays (depending on the model), new knobs, and new plastic covers over the digits. The price seemed reasonable enough for avionics. If you can't find a replacement display, check out this option.

The STC for the KT-74 listed a couple of WAAS GPS units that were approved as input to the KT-74 in addition to the Garmins. I would think that those would be much less expensive than the Garmin.

My install in a Piper Cherokee was around $1000 and it took the avionics shop most of a day. They did software upgrades to my transponer and Garmin GPS, repIaced my RG-58 Coaxial with RG-400, and did the plumbing and connection for the squat switch. I replaced a King 76C so I did not have to change the tray and only minor changes to the connector. I did not elect to have the altitude allert installed or TIS connected to my Garmin 430W.

There are only a couple of wires to the Garmin 430W: one for the GPS input and another if you want TIS (not TIS-B ) displayed on the G430W. You can also connect to the audito panel if you want to use the altitude alert feature. The connection to the audio panel requires you to use the KT-74 tray. If you have RG-58 coaxial cable for the transponder, you have to replace it with RG-400. The STC lists a specific speed switch which sells for about $100. The wiring pinouts are in the STC; the requirement for newer coaxial cabling is part of the King KT-74 installation manual but not discussed in the STC.

You need to install the new tray only if you are connecting the transponder to the audio panel for altitude deviation alerts and such. .

The King 74 still needs an altitude encoder. The old Narco Mode C encoder that I was using for my KT-76C worked fine. The STC for the Trig 31 is similar to the King 74 STC but there are several differences as well. There are also differences in pin outs. The King 74 STC permits several GPS units beyond the Garmin 430w/ 530w to be used including the newer Garmin GTNs. You only need to install the new KT-74 tray if you want to connect it to your audio panel for altitude and traffic alerts. All other features work fine with your old tray and connector but connections have to be made to your speed sensor switch, to the GPS for ADS-B input, and another connection to your GPS unit if you want TIS displays on your GPS.

Actually, the KT 74 only needs the new tray if you plan to connect the KT74 to your audio panel. You would connect to the audio panel for altitude deviation alerts or TIS-A traffic alerts. Those connections are not required for an ADS-B installation. My avionics shop recommended that if you do the TIS-A traffic alerts to also install a mute switch so that KT74 traffic reports relating to other planes in the pattern do not drown out your communications with the tower while on approach.

If you still have the RG-58 cable, it will have to be upgraded. My avionics shop said that the King installation instructions for the KT74 require the upgrade even if you are installing the transponder for just Mode S. I believe that they upgraded mine to RG-400.

This installation was on a Cherokee but the STC did not distinguish between retractables when discussing the requirement for the switch. Seems logical that your current switch could be used if it meets the same trigger speeds but I would discuss with the avionics shop you plan to use for the installation. I understand that the Garmin transponder does not require a switch, but uses the GPS speed as a trigger instead.

I just had the ADS-B out installation done with my KT74 and Garmin 430W at Lancaster Avionics, PA. Installation went well. They were able to do the ADS-B out installation using the existing 76A tray and existing connector but you need the new tray if they connect the transponder to the audio panel for the altitude alerts. I had an autopilot and did not believe that I would need that feature. The STC calls for a speed sensor switch that triggers at about 34 knots to determine ground/flight status. The switch runs about $100. They updated the transponder from version 3.9 to 3.12 and my Garmin to version 5.10 and they had to upgrade my transponder coaxial cable from RG-58 to RG-400. I have made two flights since installation and it works well with Wing-X. I also sent the email to the FAA for a performance report [ '9-AWA-AFS-300-ADSB-AvionicsCheck@faa.gov' with my tail number, transponder make and model, and GPS make and model ] and the report showed no errors and good performance. The FAA report is not required but does give some assurance that everything works. I am all set.

The JPI 730 and 830 have use the same head and same firmware. The only difference is the bundling of sensors included with each, so define what you need and compare prices between the 830 bundle and the 730 plus the sensors you actually need.

Garmin 5.20 out now.

Dale, I have the same setup as you do but no ADS-B out until the end of the month. I have seen the ghost plane too. Really scary the first time you see it; I kept looking for another plane under me. You really need the filter because you will pick up aircraft at FL42 that is not really a factor for GA planes.

I have a King KT-76C with tray in excellent condition. Working fine when I replaced with my KT-74 but no yellow tag. Will take $1100.

Yes. Read the STC; it lists all the approved GPS units.

Actually, because the King KT-74 is a mode S transponder, it will display traffic on the Garmin 430W when it is in the vicinity of one of the few facilities that transmits Mode S traffic if your installer makes the connection. I have heard that the Mode S reporting is much slower refresh than ADS-B and is primarily around Class B airspace.

The STC requires Garmin version 5.0. Version 5.10 was the latest but there were several reports that that version caused some issues with the JPI engine analyzers on remaining fuel. Hope that version 5.0 does not have that issue.

The King KT-74 was just approved: http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/177D59518E6B6AB086257D4A00525C51?OpenDocument&Highlight=kt74

Here is information on the STC for the Trig 31: STC Number: SA00744DE This certificate issued to: Peregrine STC Holder's Address: 13000 E Control Tower Road Suite 219 Box K-4 Englewood CO 80112 United States Description of the Type Design Change: Installation of the Automatic Dependent Surveillance – Broadcast (ADS- Out Equipment using a Trig Avionics TT31 Transponder and an approved position sensor Application Date: 11/14/2011 Status: Amended, 07/31/2014 Responsible Office: Denver Aircraft Certification Office (ANM-100D), Tel: (303) 342-1080 TC Number -- Make -- Model: 3A12 -- Cessna Aircraft Company -- 172 3A12 -- Cessna Aircraft Company -- 172A 3A12 -- Cessna Aircraft Company -- 172B 3A12 -- Cessna Aircraft Company -- 172C 3A12 -- Cessna Aircraft Company -- 172D 3A12 -- Cessna Aircraft Company -- 172E 3A12 -- Cessna Aircraft Company -- 172F (USAF T-41A) 3A12 -- Cessna Aircraft Company -- 172G 3A12 -- Cessna Aircraft Company -- 172H (USAF T-41A) 3A12 -- Cessna Aircraft Company -- 172I 3A12 -- Cessna Aircraft Company -- 172K 3A12 -- Cessna Aircraft Company -- 172L 3A12 -- Cessna Aircraft Company -- 172M 3A12 -- Cessna Aircraft Company -- 172N 3A12 -- Cessna Aircraft Company -- 172P 3A12 -- Cessna Aircraft Company -- 172Q 3A12 -- Cessna Aircraft Company -- 172R 3A12 -- Cessna Aircraft Company -- 172S 3A13 -- Cessna Aircraft Company -- 182 3A13 -- Cessna Aircraft Company -- 182A 3A13 -- Cessna Aircraft Company -- 182B 3A13 -- Cessna Aircraft Company -- 182C 3A13 -- Cessna Aircraft Company -- 182D 3A13 -- Cessna Aircraft Company -- 182E 3A13 -- Cessna Aircraft Company -- 182F 3A13 -- Cessna Aircraft Company -- 182G 3A13 -- Cessna Aircraft Company -- 182H 3A13 -- Cessna Aircraft Company -- 182J 3A13 -- Cessna Aircraft Company -- 182K 3A13 -- Cessna Aircraft Company -- 182L 3A13 -- Cessna Aircraft Company -- 182M 3A13 -- Cessna Aircraft Company -- 182N 3A13 -- Cessna Aircraft Company -- 182P 3A13 -- Cessna Aircraft Company -- 182Q 3A13 -- Cessna Aircraft Company -- 182R 3A13 -- Cessna Aircraft Company -- 182S 3A13 -- Cessna Aircraft Company -- 182T 3A13 -- Cessna Aircraft Company -- R182 3A13 -- Cessna Aircraft Company -- T182 3A13 -- Cessna Aircraft Company -- T182T 3A13 -- Cessna Aircraft Company -- TR182 2A3 -- Mooney International Corporation -- M20 2A3 -- Mooney International Corporation -- M20A 2A3 -- Mooney International Corporation -- M20B 2A3 -- Mooney International Corporation -- M20C 2A3 -- Mooney International Corporation -- M20D 2A3 -- Mooney International Corporation -- M20E 2A3 -- Mooney International Corporation -- M20F 2A3 -- Mooney International Corporation -- M20G 2A3 -- Mooney International Corporation -- M20J 2A3 -- Mooney International Corporation -- M20K 2A3 -- Mooney International Corporation -- M20L 2A3 -- Mooney International Corporation -- M20M 2A3 -- Mooney International Corporation -- M20R 2A3 -- Mooney International Corporation -- M20S 2A3 -- Mooney International Corporation -- M20TN 2A13 -- Piper Aircraft, Inc. -- PA-28-140 2A13 -- Piper Aircraft, Inc. -- PA-28-150 2A13 -- Piper Aircraft, Inc. -- PA-28-151 2A13 -- Piper Aircraft, Inc. -- PA-28-160 2A13 -- Piper Aircraft, Inc. -- PA-28-161 2A13 -- Piper Aircraft, Inc. -- PA-28-180 2A13 -- Piper Aircraft, Inc. -- PA-28-181 2A13 -- Piper Aircraft, Inc. -- PA-28-201T 2A13 -- Piper Aircraft, Inc. -- PA-28-235 2A13 -- Piper Aircraft, Inc. -- PA-28-236 2A13 -- Piper Aircraft, Inc. -- PA-28R-180 2A13 -- Piper Aircraft, Inc. -- PA-28R-200 2A13 -- Piper Aircraft, Inc. -- PA-28R-201 2A13 -- Piper Aircraft, Inc. -- PA-28R-201T 2A13 -- Piper Aircraft, Inc. -- PA-28RT-201 2A13 -- Piper Aircraft, Inc. -- PA-28RT-201T 2A13 -- Piper Aircraft, Inc. -- PA-28S-160 2A13 -- Piper Aircraft, Inc. -- PA-28S-180

I have a King 74 installed in my Piper Warrior now. It is connected to my external blind encoder (same one that I used with my old King 78A). The King 74 is built on the Trig 31 circuitry. The Trig 31 installation manual describes inputs for either a serial (preferred) or parallel encoder and an output to a GPS which it describes as an altitude repeater. I believe that this is intended for non-WAAS GPS installations and just passes throught the altitude from the external encoder for precision approaches. My King 74 did not come with an installation manual so the Trig manual may be as close as you can get unless you are a Bendix-King dealer.

I have used the SkyRadar S1 for a few years with Wing-X. It works very well. Ocassionally I will lose the ADS-B signal but the outage is usually only for a minute or so. I usually have it on the dash but am thinking of mounting it under the seat and use a remote antenna attached to a side window. That said, take a look at the Skyguard receivers which look almost identical to the SkyRadar receivers, have great reviews, and are a little less expensive.