Garmin GTX345: Questions

Sinistar

Sinistar

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Brad
So this thing is new to me. I figured out how to get into the setup menu....watch out!!! Anyway, a couple of questions:

1.) Is there anyway to set a altitude alert less than 200ft?

2.) If I enable having more than one ID (ie. tailnumber) can I use a unused tail number for anonymity? Or is there a way to enter all "-----" or something. I like that I can see my flight but it would be nice to not always show it.

3.) I see there is an entry for Stall Speed. If I were to enable this what does it do? Is it just for other equipment or would it enable another aural alert?

4.) Is it true that once I have flown in the system I can no longer get the rebate. In other words if I found a unused rebate some upcoming Wed can I still fly it and get it.

5.) I didn't even know about the temperature probe option for OAT and Density Altitude. Roughtly what does it cost to add it? Whether its needed or not is another question. Just curious what people spent to get this option connected.
 
2. No.
3. It's how the transponder knows if you're airborne. If set too low, you'll get an air-on-ground failure.
 
Had aGTX345 installed, not cheap, got rebate though. Problem is I am told the GTX 345 can't talk to my King KMA 20 audio panel, so now I need a new audio panel...ugh
 
GeorgeC said:
2. No.
3. It's how the transponder knows if you're airborne. If set too low, you'll get an air-on-ground failure.
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Are you 100% sure about the stall speed entry? On mine it is not enabled and still computes the airborne time perfectly. I noticed there were specific settings for that but just like the stall speed settings, I did not change anything. Maybe the stall speed setting is to assist with whatever other method is used?
 
Luigi said:
Had aGTX345 installed, not cheap, got rebate though. Problem is I am told the GTX 345 can't talk to my King KMA 20 audio panel, so now I need a new audio panel...ugh
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We have the old King KMA24H Audio panel (helicopters?) and the GTX345 aural callouts work. Not sure if that helps but thought I would mention it.
 
2. You can use a different tail number if your installer enables that option. That way my Angel/Hero flight matches the call sign I file under. However there is still the hex code assigned that we don’t see that would tie it to you.
 
I have the KMA 20 audio panel and with the GTX 345 connected I had little volume on both my coms.
Sure wish the avionics shop had warned me.
 
Did you go into the GTX345 setup menus and adjust up the volume...yours might be set too low?

Hold in the ENTR button when powering it up. Search around the menus and you'll find the output volume level. Ours needs 60 but during the ground test I put it at 40 because 60 sounded too loud....but i could barely hear during a flight test it so bsck to 60.
 
4) Rebate
You must register for the rebate before first flight

5) OAT probe

Very cool and inexpensive feature. The GTX-345 displays density altitude instead of pressure alt. Pressure alt is still available one button press away. The probe costs ~$110. And labor for installation is less than an hour. My plane was 40 mins extra.

-David
 
Landing Fees said:
2. You can use a different tail number if your installer enables that option. That way my Angel/Hero flight matches the call sign I file under. However there is still the hex code assigned that we don’t see that would tie it to you.
Click to expand...

I think you meant you can use a call sign different from your tail number, not a different tail number. The call sign needs to match any flight plan or what you use when you contact ATC. Only approved call signs may be used.
 
Is it equipped to display OAT (with probe installed)?

My Guardian OAT failed, so this would be useful to me.
 
Let'sgoflying! said:
What callouts should the 345 be making?
(mine is silent)
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Leaving Altitude (if armed), Countdown timer (when reaching zero), nearby traffic (has to be pretty close).

If its wired to you audiopanel the GTX345 output volume might be too low. You can check it all on the ground in setup mode.
 
Yes it supports a OAT probe and will then also compute Density Altitude. I didn't know so mine wasn't installed. Sounds like an extra $250 or so for the part and some labor.
 
John Collins said:
I think you meant you can use a call sign different from your tail number, not a different tail number. The call sign needs to match any flight plan or what you use when you contact ATC. Only approved call signs may be used.
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So it doesn't sound like you can just set a unused tailnumber...it has to exactly match your tailnumber or a signed callsign. Got it. Would you happen to know which FAR calls that out?
 
91.227.
Someone set our club plane incorrectly and we promptly received a phonecall about it.
 
Sinistar said:
So it doesn't sound like you can just set a unused tailnumber...it has to exactly match your tailnumber or a signed callsign. Got it. Would you happen to know which FAR calls that out?
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There are 2 transmissions of your identity. The Mode-S hex code which is derived from your tail number and is always transmitted and can generally only be changed by an installer or a bunch of configuration menus. And if enabled a flight ID or call-sign which can be changed from the front panel(assuming that feature is enabled) which should match your tail number or callsign(if operating on an Angel Flight or similar)

Here's the details from 91.227

> An indication of the aircraft assigned ICAO 24-bit address, except when the pilot has not filed a flight plan, has not requested ATC services, and is using a TSO-C154c self-assigned temporary 24-bit address; (This is the internal ID/hex code or anonymous mode that some UAT transmitters have)

> An indication of the aircraft's call sign that is submitted on the flight plan, or the aircraft's registration number, except when the pilot has not filed a flight plan, has not requested ATC services, and is using a TSO-C154c self-assigned temporary 24-bit address; (This is the front panel selectable ID)
 
Sinistar said:
2.) If I enable having more than one ID (ie. tailnumber) can I use a unused tail number for anonymity? Or is there a way to enter all "-----" or something. I like that I can see my flight but it would be nice to not always show it.
Click to expand...

Sorry... You're stuck. The extra ID is for if you have a flight number in addition to a tail number. The tail number is *always* broadcast on 1090.

The extra ID function is there if, for example, you fly under a callsign other than your tail number. So if your tail number is N12345, and you fly for Angel Flight as Angel Flight 345, you would file under NGF345 and put that in as your callsign... But it'll still be broadcasting N12345 as well.

chartbundle said:
Here's the details from 91.227

> An indication of the aircraft assigned ICAO 24-bit address, except when the pilot has not filed a flight plan, has not requested ATC services, and is using a TSO-C154c self-assigned temporary 24-bit address; (This is the internal ID/hex code or anonymous mode that some UAT transmitters have)
Click to expand...

And TSO-C154c is for UAT equipment on 978 MHz. 1090 has no such allowance for an anonymous mode, so any 1090 MHz or dual-band equipment is going to be broadcasting your tail number all the time.

(Yes, I know it's not actually the tail number that's broadcast, but there's a 1-to-1 relationship between the hex codes and the tail numbers, with a simple formula to convert.)
 
flyingcheesehead said:
And TSO-C154c is for UAT equipment on 978 MHz. 1090 has no such allowance for an anonymous mode, so any 1090 MHz or dual-band equipment is going to be broadcasting your tail number all the time.
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True, but so that pilot's are not confused, there are no dual-band ADS-B Out systems on the market. Pilots can install both types of ADS-B Out systems in the same aircraft, but in most cases dual band refers to ADS-B In and not to ADS-B Out. Of course, ADS-B In does not broadcast anything.
 
John Collins said:
True, but so that pilot's are not confused, there are no dual-band ADS-B Out systems on the market. Pilots can install both types of ADS-B Out systems in the same aircraft, but in most cases dual band refers to ADS-B In and not to ADS-B Out. Of course, ADS-B In does not broadcast anything.
Click to expand...

True, but I'm unaware of any dual-band systems that have their Out on 978.
 
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