Has anybody else experienced this? Maybe I touched something on the IFD100 to change the frequency, but I didn't think you could change the Active Frequency from the IFD100.

On my return trip it happened as well but this time I was expecting and programmed the frequencies to the #2 Comm before starting the IFD100.

Definitely would classify this as a 'critical' defect in my mind unless there is some way to turn this automatic sync off - if nothing else it should default from the 540 to the 100 not the other way around.

Happened to me too!  Not good.  I was taking off from Watsonville and turned on the IFD100 during runup.  As I entered the runway I wondered why the guy landing on the cross runway stopped talking, especially as I announced.  I could see him so I took off, but I probably really pissed him off by taking off on a cross runway without any radio calls. But when the guy took off behind me, all in silence, I looked down and some strange freq (some SFO ground freq) was in the 540.

I put it down to not knowing the IFD100 yet but I read later you are not supposed to be able to change the active frequency with it.  There is CTAF there so I didn't not change the active frequency myself as I took the runway.

So if you remember some A*hole taking off on a busy day from Watsonville without a radio, sorry.

Somehow I also had it in my head that you couldn't swap freqs from an IFD100.  I found this post from last year shortly after the IFD100 was announced that indicates Avidyne was still thinking about how to handle that, and it appears that they decided to change that behavior.

From  http://www.avidynelive.com/forum_posts.asp?TID=1025&KW=ifd100&PID=11786&title=ifd-software-release-10200#11786" rel="nofollow - http://www.avidynelive.com/forum_posts.asp?TID=1025&KW=ifd100&PID=11786&title=ifd-software-release-10200#11786 :

AviJake wrote: brou0040 wrote: AviJake wrote: Com freqs are a little different.  We don't have a Swap function on the IFD100.  We are debating adding one (there are real pros and cons to each position).   So in that case, you can use Freq List on the IFD100 to find a freq and push it into standby but you can't get it into Primary and then over to the panel mount IFD.  Note that with dual panel mount boxes, you don't share com freqs between the two IFDs either.</span> I vote for the freq swap function.  I understand not swapping from the 100 to the 540 primary (although that option would be nice).   Yeah, we'll probably change to do both. Maybe initial release of IFD100, maybe a follow-on release.

In the cases reported, have you put the IFD100 into the background (either by navigating to another app or placing the iPad into the sleep mode)? If that is the case, you should NOT put the app into the background as it sounds like it is trying to sync the last known frequencies.

If you plan to navigate away from the app or are opening after it hasn't been running in the foreground in the case of the OP, ensure that you are fully closing the app ( http://support.apple.com/en-us/HT201330" rel="nofollow - https://support.apple.com/en-us/HT201330 ) before reconnecting it to the IFD network.

* Orest

Congratulations Oskry! You went out and bought an iPad so you can enjoy the IFD100! 

That's a negative, just commenting on what was noted in the post above.

* Orest

Under "Display and Brightness", AutoLock, you can select Never ... but yes it would be nice if it was built into the program like ForeFlight or Garmin Pilot.

The IFD100 should be robust enough, in my opinion, that you can switch apps without fully shutting it down.  That is kinda what is expected of modern apps...  

I accept that there might be an issue in the short term and this is a workaround, but this is not a minor issue.  I don't remember what I did with the iPad in Watsonville.  I also use WingX and may have brought that up.  But what happened to me, departing "without a radio" at a busy airport with two cross runways in use, could have been a serious situation. 

Maybe it was and I just couldn't hear the yelling on the radio.