On 09/23/2017 09:27 AM, wrote:
Dan- You pretty much HAD to buy the TT22, as the 250 watt transmit is required for altitudes over 10,000 MSL. And out here in Moriarty, we are tempted to put the landing gear down if we get below that!


Trig says the TT21 is good to 15,000 msl, but yeah, the cost and average
current consumption of the TT22 are only slightly higher for the TT22.
I wouldn't consider a TT21 for a new installation, even forgetting about
the ADS-B issue.