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  #71  
Old 03-24-2016, 08:49 PM
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airguy airguy is offline
 
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Quote:
Originally Posted by N941WR View Post
[ed. Removed vendor bashing stuff... dr].
You just answered your own question, and it continues to work as long as people continue to tolerate it.
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Last edited by DeltaRomeo : 03-27-2016 at 04:29 PM.
  #72  
Old 03-24-2016, 08:51 PM
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g3xpert g3xpert is offline
 
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Post ADS-B Receiver for GPSMAP 696

Quote:
Originally Posted by rolivi View Post
G3X will ring in soon, I'm sure!

I love that Garmin has watchers here to help us de-clutter the infonet!
Thank you Rob.

Others are correct that the only compatible interface to that unit for a 696 appears to be a TIS-A traffic emulation (no weather).

It also appears to be a single frequency traffic receiver (978 Mhz only), which is a poor choice for an ADS-B traffic receiver.

Not sure why you would choose to rely on that type of ADS-B receiver for your important traffic data when dual frequency (978/1090 Mhz) traffic and weather receivers like the GDL 39 are so affordable. Here is one example.

Good or bad, the U.S. is a dual frequency country with some ADS-B Out aircraft transmitting on 978 Mhz and some on 1090 Mhz. The latest FAA equipage report shows that more than 70% of the aircraft which have equipped for ADS-B Out have equipped with a 1090 Mhz transmitter and there is strong evidence this trend will hold.

Why would anyone choose a 978 Mhz only ADS-B traffic receiver that is "deaf" to 70% of the ADS-B Out aircraft unless it is getting ADS-R assistance from a ground station that may or may not be available or in view?

Using a TIS-B datalink from a ground station as a crutch to enable us to see Mode C traffic as an interim solution until "everyone" is ADS-B Out is fine, but you sure don't want to invest in an ADS-B receiver that isn't dual frequency for both types of ADS-B Out transmitters and have to rely on ground stations to complete your traffic picture (with ADS-R) forever.

If you have a single frequency 978 Mhz receiver, you could be flying straight at a 1090ES aircraft at your altitude a short distance away and not be able to see it without getting help from a ground station.

Even if you are located close to an ADS-B ground station, by the time you get down to traffic pattern altitude approaching an airport, you will often lose line-of-sight to the ground station and will be on your own to see both 978 Mhz and 1090 Mhz transmitting aircraft in the pattern and approaching the airport.

Of course this isn't a problem for the dual frequency GDL39 receiver since it works well to directly see both types of ADS-B Out traffic no matter where you are flying.

Thanks,
Steve
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  #73  
Old 03-24-2016, 10:11 PM
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Default Question for Steve

Would it work to leave my GDL 39 running and just use the 978 UAT to meet the transmit out function?
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  #74  
Old 03-24-2016, 10:43 PM
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RV7A Flyer RV7A Flyer is offline
 
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Default

Quote:
Originally Posted by g3xpert View Post
Why would anyone choose a 978 Mhz only ADS-B traffic receiver that is "deaf" to 70% of the ADS-B Out aircraft unless it is getting ADS-R assistance from a ground station that may or may not be available or in view?

Using a TIS-B datalink from a ground station as a crutch to enable us to see Mode C traffic as an interim solution until "everyone" is ADS-B Out is fine, but you sure don't want to invest in an ADS-B receiver that isn't dual frequency for both types of ADS-B Out transmitters and have to rely on ground stations to complete your traffic picture (with ADS-R) forever.
One reason: FIS-B weather. Second reason: coverage by ground stations is already very extensive throughout the country, and should only become more so. Third reason: Mark 1 eyeballs still work.

I think the expectation is that *most* GA planes will be 1090ES out/978 UAT in, using the ground stations as ADS-R, and with the expansion of the ground stations, by 2020, they should see the same traffic as they would with a dual-frequency ADS-B In system.
  #75  
Old 03-24-2016, 11:25 PM
ccrawford ccrawford is offline
 
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Default

From the ADS600-EXP store page:

Quote:
1090ES Receiver - Now included as a standard feature. A future software update (free) will enable the feature at a later date.
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  #76  
Old 03-25-2016, 06:49 AM
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g3xpert g3xpert is offline
 
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Post

Quote:
Originally Posted by flightlogic View Post
Would it work to leave my GDL 39 running and just use the 978 UAT to meet the transmit out function?
Hello Nick,

Yes, you may use the GDL 39 as your ADS-B traffic and weather receiver while a 978 UAT is being using to satisfy the need for ADS-B Out.

Thanks,
Steve
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  #77  
Old 03-25-2016, 07:48 AM
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GalinHdz GalinHdz is offline
 
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Quote:
Originally Posted by RV7A Flyer View Post
One reason: FIS-B weather. Second reason: coverage by ground stations is already very extensive throughout the country, and should only become more so. Third reason: Mark 1 eyeballs still work.
FWIW the 978WX is more important to me than the traffic display. Don't get me wrong the traffic display is awesome but my Mk1 eyeballs are primary for traffic detection when VFR. But, I can't get WX information at my destination with my Mk1 eyeballs until it might be too late. That is the reason I paid for XM weather (no traffic there) before ADS-B even existed.

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Last edited by GalinHdz : 03-25-2016 at 07:52 AM.
  #78  
Old 03-25-2016, 08:07 AM
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Walt Walt is offline
 
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Quote:
Originally Posted by N941WR View Post
Different issue.

[ed. Removed vendor bashing stuff... dr].
I think that's an unfair characterization of Garmin's product development, and the same could be said for every other avionics manufacturer as well if that were the case.

I believe the reality is packaging changes for various reasons with product development, trying to fit all the new stuff in the "old box" just doesn't work very well when it comes to design and manufacturing.
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Last edited by DeltaRomeo : 03-27-2016 at 04:29 PM.
  #79  
Old 03-25-2016, 08:19 AM
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g3xpert g3xpert is offline
 
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Post

Quote:
Originally Posted by RV7A Flyer View Post
One reason: FIS-B weather. Second reason: coverage by ground stations is already very extensive throughout the country, and should only become more so. Third reason: Mark 1 eyeballs still work.

I think the expectation is that *most* GA planes will be 1090ES out/978 UAT in, using the ground stations as ADS-R, and with the expansion of the ground stations, by 2020, they should see the same traffic as they would with a dual-frequency ADS-B In system.
Hello,

Quote:
One reason: FIS-B weather
There seems to be some confusion. This discussion is centered on traffic, not FIS-B weather. There is no question that receiving free FIS-B weather is one of the reasons why all of us want an ADS-B receiver, but it has nothing to do with the dual frequency nature of the ADS-B Out traffic that is being discussed.

Quote:
Second reason: coverage by ground stations is already very extensive throughout the country, and should only become more so
The FAA has stated that "The FAA has installed 634 ADS-B ground stations throughout the US, completing baseline deployment of the network." The FAA has announced that in 2016 they are installing 3 stations in Mexico, but we are not aware of an significant changes planned for the U.S. network.

This ADS-B coverage map shows the coverage at 500' AGL in yellow and 1500' AGL in blue.



The coverage in the East is obviously much better than in the west and Alaska. Everyone choosing to buy a single frequency 978 Mhz ADS-B receiver should be aware that they are wholly dependent on ground station support to see 1090ES traffic (70% of ADS-B Out aircraft), and this just isn't possible in many areas, especially at low altitude when taking off and landing.

We primarily want to educate people to know that better equipment without this limitation is available. The dual frequency GDL 39 was introduced in 2012 and all of Garmin's ADS-B receivers are dual frequency including the GDL 84/88, GDL 39R, GDL 39 3D, and the new GTX 345.

While even a single frequency traffic receiver is much better than nothing, we value the low altitude air-to-air support provided by dual frequency receivers, wouldn't want a single frequency traffic receiver in any of our aircraft, and don't think any of you do either.

Thanks,
Steve
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  #80  
Old 03-25-2016, 08:34 AM
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Steve Melton Steve Melton is offline
 
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Default sitting

what am I doing? just sitting waiting for the dust to settle.
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