The transmitter replacement makes lots on sense. It takes some time from the order date to the shipping date and then you need to let the transmitter 'cook' for a bit. When you think of the various power levels and number of transmitters needed at any given time, mostly it's not a 'we have X number sitting on the shelf ready to roll' but rather, we'll get that built for you and ship it. Sure, some transmitters might be ready to roll out fast (ie: like an LPFM transmitter right now) because you don't go broke carrying some inventory but when you get to the big boys I'd think it is another matter. Plus once it gets ready to ship, they'll check everything before shipping, likely for a couple of days.