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We're engineers, so we are better at answering questions about how things work and interface, but we know that dealers are accepting orders and should be receiving stock soon. Thanks for your interest, Steve |
Good thread! Good questions and excellent answers.
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Question to Steve:
The GTX 345 Installation Manual states that a fan is not included or needed. The mechanical drawings Figure B-2 shows a VENT opening in the unit and the rack. Question; is this vent opening only used if a fan is used on the back of the chassis, or do I need to mirror the vent opening in my radio stack side plates? |
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Good question. The side vent was added to the design just in case a fan was needed, but a fan is not needed and neither is the side vent. You may install the GTX 335/345 in a radio stack and not worry about blocking this side vent in the rack. The installation manual is not yet production released, and we are adding this guidance before doing so. Thanks, Steve |
Garmin GTX 345
Has there been any news when this unit will be released?
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Question to the experts:
It looks like I will be replacing my America-King blind encoder (outputs Gray code). The GTX 345 can be optioned with a pressure sensor module (011-03080-00) and it attaches to the Static system in place of the blind encoder. So, the Txponder gets the needed altitude info. Does the GTX 345 also output this info in a RS-232 interface or ARINC interface available to other devices? Thanks. |
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Good question. Yes, one of the 4 GTX 345 RS-232 ports may be configured for "ALT FMT 1" format which transmits the pressure altitude data from the built-in pressure sensor module. It is a fairly standard serial encoder format that is probably usable by a wide variety of devices. The ASCII character format of this transmission is documented in Appendix A of the installation manual. Thanks, Steve |
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Cheers, Stein |
I did. Thanks
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Question for Garmin Experts:
Garmin indicates the GTX 345 Transponder is compatible with Foreflight Mobile and using Foreflight enables the use of these features: - ADS-B Weather - ADS-B Traffic - Attitude (AHRS) - GPS My question: Is the Garmin GTX 335 Transponder along with a Garmin GDL 39R or GDL 39D compatible with Foreflight? Will this configuration (GTX 335 and GDL 39D or R) using Foreflight function as indicated above (ADS-B WX - Traffic, Attitude AHRS and GPS)? Thank you, |
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According to this Foreflight web page, they support interfacing to the Flight Stream 110/210 and GTX 345, but not to the GDL 39. https://support.foreflight.com/hc/en...Garmin-Connext Not sure why this is the case since the GDL39, GDL39R, and GDL39 3D use the same Connext protocol as the FS 110/210 and GTX 345. Garmin Pilot, the aera 660, and the aera 79X work equally well with all of these devices. What is even more surprising is that they say they support the GDL39 as a Bluetooth connection to provide GPS position data, but not traffic and weather. Thanks, Steve |
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Thanks for the Foreflight link and the quick response to my questions. Based on my research, using a Garmin solution, it appears I get the most for my money if I go this route: - Garmin GTX 335 Transponder (GPS position source is my Garmin 430 W) $2,900.00 -Garmin GDL 39R ADS-B Dual Receiver: $800.00 - Garmin Flight Stream 210: $1,000.00 Approximate total: $4,700.00 While that's a couple hundred dollars less than the Garmin GTX 345, I get the complete Flight Stream 210 capability and can use an Ipad with Foreflight or Garmin Pilot to push flight plans to my Garmin 430 W. Here's my question: The literature on the Garmin Flight Stream 210 indicates it has an "Industry-Leading GPS". Can the GPS on the Flight Stream 210 be used a GPS position source for the Garmin GTX 335, in the same way as a Garmin GPS 20A, if my Garmin 430 W (GPS position source) failed? Thank you again! |
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More good questions. The Flight Stream 210 has internal attitude and pressure sensors, but doesn't have an internal GPS, and can't be used as your rule compliant position source for the GTX 335. The Flight Stream 210 does pass along the GPS data from your 430W to any external displays connected to the Flight Stream 210 (when your 430W is available). Thanks, Steve |
From the GTX 3x5 Install Manual: there is a nice listing / description of the Garmin Order numbers for the different version of the units. In each case, a configuration module is included.
I will be ordering the optional Pressure Sensor that also includes a configuration module. Does this mean that I will end up with an "extra" config module that I will not be using? Or will there be a GTX 3x5 ordering option that deletes the config module and replaces it with the pressure sensor option? |
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You are correct that all of the GTX 335/345 transponder bundles come with an installation kit complete with configuration module. There is no ordering option to order a transponder without the configuration module. The optional pressure sensor module (altitude encoder) kit, part number 011-03080-00, includes a 4 conductor harness that plugs into the same 4 pins on the P3251 connector as the configuration module in an installation without the pressure sensor. The pressure sensor module incorporates a memory module that performs the same function as the configuration module. Thanks, Steve |
Steve, I understand. Thanks for the feedback.
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Question for Garmin Experts:
The Garmin 345 currently supports Foreflight and Garmin Pilot. Will it support other programs such as FltPlanGo and WingXPro7 in the near future? Duane |
This is just an FYI to the group...
The new Garmin GTX 345 is shipping and one has shown up in the local avionics shop. |
Mine was delivered Thursday. Plan to install it tomorrow I hope.
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GTX 345 to 696?
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Any chance of doing a direct wire to a 696 for traffic and weather? Thanks - |
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As you probably know, the 696 communicates over RS-232 to the dual frequency GDL 39 ADS-B traffic and weather receiver. Fortunately, the GDL 39 does everything the GTX 345 dual frequency ADS-B receiver does. The GTX 345 doesn't use the same traffic and weather protocol as the GDL 39, and the 696 can't communicate with the GTX 345. Thanks, Steve |
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Garmin Experts (Steve),
I'm trying to decide between these two options to gain 2020 compliance: 1. Garmin GTX 335 All-inclusive 1090 MHz ADS-B ?Out? Transponder ($2,995 retail) connected with a Garmin GDL39R ($799 retail). Approximate total = $3,794. vs 2. Garmin GTX 345 All-in-one Transponder Solution for ADS-B ?Out? and ?In? ($4,995 retail). A retail Garmin dealer indicates the following: Garmin GDL39 - "Note 2: GDL 39 can only receive ADS-B information in the USA." https://www.aircraftspruce.com/catal...lickkey=856371 Here are my questions: In the retailers reference to the GDL39. Does (GDL 39 can only receive ADS-B information in the USA) it mean when flying outside of the USA the GDL39R will not provide traffic alerts to a compatible Garmin device (i.e. Garmin Pilot) for other aircraft within proximity using a 1090 ES transponder? Does the Garmin GTX 345 allow the user to receive ADS-B information outside of the USA provided that country has the ADS-B infrastructure is in place and supports the territory you're operating from? (For example, some locations in Canada, Mexico and/or the Bahamas'). I am trying to understand the differences and the similarities between the GDL39 ADS-B dual receiver and the dual receiver ADS-B In receiver that lives inside the GTX345. Are there any differences? Thanks again! |
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Obviously as we get closer to 2020, more aircraft will be providing compliant ADS-B Out, so the traffic differences between the two should be indistinguishable. Thanks, Steve |
Charlie, do you have a certified GPS now in your RV8 to feed lat long to the 335? If not then the 335 with the GPS is $3795. Gets close to a wash with an easier install.;)
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I have a Garmin 430 W as a certified position source. I like it too. I originally was going to get a Garmin GTX 330 ES to replace my GTX 327. |
AHARS?
Hey G3Expert...
Looking through the GTX 345 Pilot Manual, I see reference to an AHARS unit built into the 345. Will the 345 push attitude info out over Bluetooth to an iPad running Garmin Pilot, to provide attitude reference in the Synthetic Vision feature of the app? Thanks. |
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Yes it will. The pitch/roll offset calibration for the GTX 345 attitude sensors is a very simple operation after you have it installed in your panel. Thanks, Steve |
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Andy |
Steve...
I currently have a GTX 327 installed in my Flight Design CTSW. If I ungrade to a GTX 345: 1) The GPS antenna is included (GA-35 IIRC), correct? 2) Could I use my existing Mode C antenna for the transponder component? 3) Do I need a specific ADS-B antenna? If so, can you point me to a Garmin model? 4) Will I need a new tray? Included? 5) Is the altitude encoder included, will the one I'm using with the GTX 327 work, or do I need to buy one? Model? 6) I am planning to display traffic/weather on my iPad, but I also have a 496 installed...can traffic/weather display on a 496? Thanks! |
Is this thing on?? :D
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They can also sell just the unit without antenna if you already have the antenna. Quote:
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The optional 011-03080-00 built in altitude encoder is also available for a list price of $279. If you have ever had to calibrate several altitude points for an encoder against an altitude test set, you will like the one integrated with the GTX 345. The front panel display and controls make this really simple. Just select a pressure altitude, set the test set to this altitude, and adjust the encoder reading to match. A minimum of 3 calibration points is required. Quote:
If you install a GTX 345, you cannot connect a 396/496 since the GTX 345 only supports ADS-B traffic and weather, and the 396/496 do not support this interface. The aera 660/795/796 support full ADS-B traffic and weather when used with a GTX 345 or a GDL 39/39R. Thanks, Steve |
Thanks Steve, exactly the info I need!
I'm considering replacing my 496 with a 660 at the same time, but I need to wait until the Airgizmos dock is out for it. Airgizmos states that dock will be a direct replacement for my 496 dock, with the dimensions and mounting being identical. |
Questions for the g3xpert:
I will be installing the GAE pressure sensor module to the back of the GTX 345. Section 3.10 of the Installation Manual talks about the input source priority for different input devices when attached. However, no mention is made if the GAE is attached. The GAE will be the only pressure sense device that will be used in my aircraft. See also the list of altitude input devices in Section 5.5...no mention of the GAE. Section 6.8 talks about sensors, and Altitude Source 1 and 2. Again, the GAE module is not listed. In this section is Figure 6-25. Internal ALT Encoder Installed (yes / no). Will answering yes at this point eliminate any need to be concerned with the above questions? Again, in Section 5.5, the possibilities for altitude resolution is either 25 feet or 100 feet. Which is selected (automagically?) when using the GTX option? Thanks again... |
I don't have a G3X display. Until I upgrade or add a G3X GDU could the GTN 650 alone work with the GTX 23 for the ADS-B 2020 mandate? With the installed GTX 327 the GTN 650 can remotly control the Transponder, is it the same with a GTX 23? The dealer gave me the impression that the G3X system/display is required.
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The GTX23ES can only be controlled by a G3X system, the GTX33ES can be controlled by the 650/750 but its about 2K more than the 23 :eek:
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1. Set ALTITUDE SOURCE 1 to ALT ENC 2. Set ALTITUDE SOURCE 2 to NONE On the Internal Alt Encoder Installed page: 3. Set INSTALLED to YES 4. Set CEILING to maximum altitude you wish to use the GAE up to 30,000 ft. 5. Set the number of TEST POINTS to a minimum of 3. You will connect a test set to calibrate the GAE to match your calibrated altimeter at each of these pressure altitudes. Quote:
Thanks, Steve |
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