I'm a high school teacher (I'm certainly not an engineer) in charge of an LPFM I set up for our students. We've been on the air for a little over 2 years.
The students have done a great job! Now they want to do some upgrading to experiment with HD Radio technology. GREAT... I love a challenge but HD LPFM?!?!
I'm hoping an engineer with a kind heart will take pity on me and tell me if I'm close to the mark here.
We currently have a single bay Jampro JLCP and with our feed line all told, we have a TPO of 274 watts out of a Nautel VS300.
My goal is -14dB injection and the VS300 doesn't have enough headroom to handle the increased demand (including the expanded mp3 mode) unless i make a change to the antenna. My thought is to go to a two bay JLCP half-spaced (we can handle that space) -- bringing the TPO requirement to 202 watts. The vs300 can handle 217 watts under these conditions.
There doesn't seem to be any documentation for LPFM HD -- maybe because there aren't any as yet, but I would have to assume perhaps there may be some translators somewhere doing the low power HD thing.
Any thought's would be greatly appreciated, but remember, I'm a music teacher