From what I've seen so far, the sites do not emit periodic data bursts, at least not very often. However I frequently travel through areas well covered by couple of these repeaters, I'm not worried about that.Any way you can check if you are in range? We have a 900 here locally but analog only. East Tennessee is lots of hills and valleys with lots of thick vegetation around so my experience with a few friends running GTX mobiles has been not so hot. The audio from them sounds incredibly tiny and holy static even on simplex, but that is probably due to the radios not being properly adjusted.
At least in Colorado you probably won’t have the geographical problems I have. If it is possible to find someone with a 33cm radio I’d at least try to use the repeater from your location to verify it you can hit it from there or not.
The XTS and XTL series has to be much better on RX and TX than the GTX series radios. I’d almost put the quality of the GTX in toy category in my experience of about 4 radios.
I've never used a P25 conventional repeater, but I'm assuming the PTT tones would be there just like a trunked system or DMR site.