I guess the use case of someone knowing your network affiliation and home town but not your actual frequency is considered rare.
Go to klru.org and try to figure out what channel to tune to. Imagine, say, you have been scrounging around for an extension cord to plug in your little TV which you haven't turned on since you moved in six months ago. Say you have some affiliation with a program coming on in two minutes.
I guess this isn't a common use case, but it bit me.
Getting from "PBS Austin" to klru.org was easy. Getting from there to "channel 18" took some doing. I suspect that info is nowhere on the KLRU website.