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03-13-2016, 07:37 AM
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Join Date: Jan 2013
Location: FL
Posts: 100
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Quote:
Originally Posted by rotorbailey
Would you please look into whether there is a way to override the auto-disable of the intercom function?
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Did anyone ever answer this question?
I have the same problem (albeit with a GTR200 & GTR20) and I'm trying to design a system very similar to what rotorbailey has, without an audio panel. My PTT will be a rocker type stick mounted switch that transmits on comm1 (GTR20) when pushed forward and comm2 (GTR200) when pulled back, via a relay that switches the mic input and keys the appropriate comm. I'd want to use one of the built in intercoms (both G3X and GTR200 have one) and have the frequencies get pulled into the GTR200 from the G3X. Still waiting for a solution before I dump $20k into Garmin products.
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04-03-2016, 01:27 PM
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Join Date: Jan 2013
Location: FL
Posts: 100
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Anyone see this? Still wondering about it.
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04-03-2016, 01:35 PM
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Join Date: Feb 2011
Location: USA
Posts: 3,179
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Quote:
Originally Posted by g3xpert
Page 29-121 of the Rev. T G3X Installation Manual describes how to enable/disable the stereo intercom built into the GTR 20 radio, but the system also recognizes that if you have dual COM, you must have an audio panel with intercom and COM mic selection for multiple radios, so it auto-disables the intercom function built into the GTR 20 since it doesn't support multiple radios.
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Just like Christian, I carefully designed a COMM switch. I worked with Stein's engineers to make it all work. While I realize, an audio panel was the ideal solution, it was overkill and out of budget.
Everything worked well until the latest G3X Touch software update.
While I would love to have an audio panel, the COMM switch was a viable - and working - solution.
I would really like to see Garmin restore the "dual COMM tuning plus intercom" functionality.
Last edited by humptybump : 04-03-2016 at 03:09 PM.
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04-07-2016, 02:39 PM
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Join Date: Feb 2010
Location: Boston
Posts: 37
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Sadly this never got solved. And the G3X Team did release their fancy new experimental remote audio panel. Which looks awesome, but is not worth rewiring my whole system for. The manual COM switching works well enough except that I have to manually turn down/up the volume of the G3X-controlled remote COM 1 when I switch to/from the standalone COM 2.
Now if there was just an option for one of the discretes to mute the G3X-controlled remote COM...
__________________
Christian Bailey
Berkut 540
Robinson R44
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04-14-2016, 08:05 AM
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Join Date: Jan 2013
Location: FL
Posts: 100
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So what was the workaround? Did the latest software hard disable the intercom when you identify a second comm to the CAN bus/G3X?
I'm with you guys, the audio panel is overkill for my application, as I've only got a GTN 625, GTR 20 & GTR 200, so no Nav or beacon audio to monitor. And to top it off I wouldn't even use the tx toggle capability either as my comm 1/2 tx will be on a (on)/off/(on) rocker switch tied to a relay.
Right now we're thinking the only workaround is to use the GTR 20 tied to the G3X, and run the GTR 200 in isolation, not on the CAN bus so the (insert derogatory adjective here) G3X will still let me use the on board intercom.
Definitely frustrated. Especially since I just found this out after my panel was cut.
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04-14-2016, 10:23 AM
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Join Date: Feb 2011
Location: USA
Posts: 3,179
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Quote:
Originally Posted by FitzRX7
So what was the workaround? Did the latest software hard disable the intercom when you identify a second comm to the CAN bus/G3X?
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You can have both the GTR20 and GTR200 on the CAN bus but you cannot configure the G3X Touch to recognize both.
If you set the G3X Touch to recognize more than one COMM it will automatically disable the intercom feature of the radio.
This new "feature" is what burned me. I think this was introduced with the 4.10 softeare. Prior to that, you could have the G3X Touch use the intercom and provide tough tuning to both COMMs.
In your case you'd avoid configuring the G3X Touch for your GTR200 and treat it as a stand-alone COMM. you would still want to wire the TX interlock between the radios. (GTR200 Install Manual Rev-E pg 4-6).
Last edited by humptybump : 04-14-2016 at 10:29 AM.
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04-14-2016, 02:17 PM
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Join Date: Jan 2013
Location: FL
Posts: 100
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Interesting, ok. Now I wonder if the GTR 200 behaves the same way, if it's onboard intercom is auto disabled with the selection of 2 comms? Or maybe the GTR 200 software hasn't been "updated" (downgraded) yet and I can still use the intercom on it? My preference is to use the GTR 200 (panel mount) as my radio #1 and intercom, and GTR 20 (remote) as the #2. Do you have both or just 2 GTR 20s?
If they would just make a cheaper, <$400, audio panel "lite" box that didn't have all the miscellaneous stuff I don't need, just had 2 comm implementation and blbluetooth maybe I would buy that. But I ain't spending $1k for all that extra stuff. Maybe they could just charge $200 for a software unlock? Either way, stinks to have to do all this work to something that *is* natively capable in the system.
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04-14-2016, 02:33 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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Quote:
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If they would just make a cheaper, <$400, audio panel "lite" box that didn't have all the miscellaneous stuff I don't need, just had 2 comm implementation and blbluetooth maybe I would buy that. But I ain't spending $1k for all that extra stuff. Maybe they could just charge $200 for a software unlock? Either way, stinks to have to do all this work to something that *is* natively capable in the system.
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You're likely to see a few GMA240's pop up after the GMA 245 becomes readily available, look for an ad for mine soon 
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
Last edited by Walt : 04-14-2016 at 05:30 PM.
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04-14-2016, 04:14 PM
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Join Date: Jan 2013
Location: FL
Posts: 100
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In small tandem aircraft with GPS only IFR nav the issue with the audio panel is, in order:
1. Panel space
2. Weight
3. Cost
4. Capability that I don't need (Nav audio, Marker beacon)
If someone gave me an audio panel I wouldn't install it. Just my $.02
I'll make sure I post up what the final work around is, so like-minded minimalists can do the same.
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04-14-2016, 04:42 PM
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Join Date: Mar 2008
Location: houston, texas
Posts: 900
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What we found
We looked at this for a long time before putting a panel together. I have to cut Steve's guys and Garmin some slack on this one. We when about going for the need to be able to add whatever comes along down the road. In our case that would be a GTN-650, if we have need for it later on. We found that you can put an auto pilot controller, an audio panel, a nav-com and a GTN-650 all in a nice stack and still leave room for a buss below that on the left side of an RV-8 stock panel. Then put a 10.6 inch tough GUD-460 to the right of that and still have room for back up instruments just to the right of that. We picked GA-340 as it has a TSO'ed marker beacon receiver built into it. All you need is the antenna to plug into the back. It can be done in a small space and still allow for add-ons and up-grades as they come along and it will not brake the bank with the addition of a 900 dollar audio panel and a 60 dollar antenna & some cable. Just what we did. Hope this helps.
Yours, R.E.A. III #80888
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