In article ,
"David Eduardo" wrote:

"PocketRadio" wrote in message
...
On Mar 13, 2:15 pm, "David Eduardo" wrote:
False - 90% of IBOC power is dumped.

The insertion loss depends on the combiner system. In cases of FM, using
separate antennae, there is no insertion loss. It's still a small amount,
any way you look at it. Tower obstruction lighting or AC consumption is
much
more.- Hide quoted text -

- Show quoted text -

"Linearized transmitters capable of passing the HD-R signal are of
necessity inefficient, often in the 30-40% range.
As such they take more electricity to operate. More power is wasted in
heat and more cooling is required. It can thus
cost three times as much to operate a linearized transmitter than a
nonlinearized transmitter with the same
TPO... Additional up-front costs are incurred for the injector and
reject load as well as the transmission
line parts to connect everything together.. year times 15 years.
Include the cost of additional cooling using the same
formula... Linearized transmitters capable of passing the HD-R signal
are of necessity inefficient, often in the 30-40% range. As such they
take more electricity to operate. More power is wasted in heat and
more cooling is required. It can thus cost three times as much to
operate a linearized transmitter than a nonlinearized..."

Sure, it takes more power. But the overall cost to a station is a tiny
fraction of a percent of its operating budget. Same goes for equipment. If
the cost is significant, 1) the station can not and won't be able to compete
with better financed stations and, 2) the station should not consider HD. HD
is for significant players in significant markets.

The power savings of digital modulation over analog are over stated at
best. Digital modulation also requires more transmitter capacity
(overhead) so a larger transmitter must be purchased.

The antenna and matching systems must be more broadband than they need
to be for analog transmission. Losses will be inherently larger.

--
Telamon
Ventura, California