[BC] Digital Radio Express

[Tom Bosscher]

khcs at juno.com wrote:

> OK, our TPO is 470 watts and we have a 500-watt transmitter.  
So far, so good.  It could easily do the 517 watts or so to make up for
the combiner loss.  But, to get 47 watts of digital carrier,
it looks like we would need a 500-watt digital transmitter, combiner and a
500-watt RF line termination.  That's probably close enough to start 
working up a rough cost estimate.

	It is better than that. You need to deliver 4.7 watts, that's just 
under 5, to the antenna. The combiner will loose you 10 db, so you now 
need a 47 watt HD transmitter.

	A 500 watt termination would be a good idea, like Mike McCarthy pointed 
out. That would protect your transmitters from any kind of antenna 
problem. You would want a power sensor on that reject load, as that is 
the only way you will know if there is a problem.

	tom bosscher