I run an IFD100 on my Ipad Mini 4.   There are ADS-B towers near my location.  Still there are

aircraft that don't show up.   What traffic is still missed by ADS-B?

What version of software is your IFD540 running?

My IFD540 is direct wired to my NGT9000. I saw traffic when running 10.2.4.1, but have not seen any on the IFD since upgrading to 10.2.6.1.

An occasional aircraft that doesn't show up on the NGT9000, but 

more often,  traffic on the NGT9000 that doesn't seem to be displayed

the IFDs.  I'm still trying to analyze this, I believe some of it is 

because I don't have the range set to the optimal size on the IFDs.

That being said, I can't say enough good about the NGT9000.

It is so user friendly and easy to read, I prefer to watch the 

traffic on its display vs on the larger IFD screens.

Bob

My thoughts:

Since you have an NGT-9000 you are obviously ADS-B out equipped

You will not see other aircraft that are not transponder equipped or do not have a functioning transponder.   Your transponder will alert the ADS-B ground stations that you can accept both 1090 and 978 in and that you do not need ADS-R (rebroadcast from 1090 to 978 or vice versa) as you can/will hear the ADS-B broadcasts directly.  You will however need TIS-B broadcast from aircraft that are not ADS-B out compliant.

Keep in mind that although the current regs say that if the aircraft is transponder equipped the transponder (and ADS-B out if install) must be on at all times, including on the ground.  It amazes me how often I see aircraft just outside an area where a transponder is required that is not transmitting.  Granted the transponder can be broken but I'm guessing pilots simply turn them off so "they can't be tracked"

It also surprises me how many ADS-B out devices are misprogrammed, about 2 weeks ago I was being overtaken by an aircraft with a ground speed of 300kts, I looked at the aircraft type and it showed me that it was a helicopter.   It wasn't a helicopter it was an hawker.

Back to the NGT-9000, I found that I prefer not to have traffic displayed on the IFD and rather have it displayed solely on the NGT-9000's screen, partially because I only have the 440 and secondly the NGT's screen is uncluttered with only traffic being displayed on the screen, I find it much easier to see.  Also since I don't display traffic on the IFD I'm not sure of the vertical range, the NGT on "normal" mode will only show traffic that is within 2900 ft above or below you unless you select unrestricted mode, or either above or below at which point I think it is 9000ft.

but also those out of range of radar or adsb towers.  

I agree, I much prefer to watch the traffic on the dedicated NGT9000 display than on 

the IFD540  or the IFD100.  It is helpful to be able to change the range of viewing

for traffic while leaving the desired range alone on the IFDs.

Bob

AlanWilliams wrote: I can get the traffic from my NGT-9000 on both of my Aspens and the IFD-540.  However, weather will not show up on the IFD-540 but it does display on both Aspens.  Any idea what switch or setting I am missing?

In your IFD540 MainRS232 Config page, (3/15?), the channel to which the NGT-9000 is connected should be configured to "Capstone HS Trfc+Wx". Based on the fact that you're getting weather on the Aspens, that would be my first check.

Traffic comes over the ARINC 429 lines

Weather comes over the RS232/422 connection.

my guess is the weather is not wired to the IFD. 

The reason for my previous question.

one correction, ARINC 429 only supports traffic, but RS232/422 supports Traffic and weather