HD Radio is on the way!
Jo Jo Gunn
Dave Barnett
> Why a Full 10 dB Increase Is Necessary
>
> http://www.radioworld.com/article/89100
>
>
come up. Sweeping it under the rug, I guess. So I did a quick search.
The station that would be complaining, WWHK, was off the air during
most of the test period. When they came back on for a few days to
preserve their license I note that some of the info I see in the google
search says their signal was weak. Hmmm...
So I guess we're seeing an example of what John predicted. The big guy
squeezing out the little guy.
Oh - and you have to laugh at the way they say the spurious emissions
meet FCC part 73.317. 1 KHz bandwidth on a spectrum analyzer. FM
receivers are what - 175 KHz wide these days? I remember when KKUP had
a capacitor fail in their exciter. The resultant spurs were well within
73.317 if you measure it that way, yet you could hear KKUP on 91.1 and
91.9 - both KCSM and K-love were quite upset for the short time it went
on. But when it's digital noise, nobody can tell and the interference
goes on ad-infinitum.
Dave B.
HD Radio Farce
> Why a Full 10 dB Increase Is Necessary
>
> http://www.radioworld.com/article/89100
"Why an NPR Labs Digital High-Power Study?"
"Based on initial results of the tests, listeners noticed interference
in the audio, with nearly half indicating they would likely turn off
the radio when power was turned up to –14 dB and –10 dB on closely-
spaced stations with lightly processed formats such as news and
classical music in some portions of a coverage area, according to Dr.
Ellyn Sheffield of NPR Labs and Towson University."
http://www.rwonline.com/article/89178
"CPB/NPR to Fit Square HD Peg Into Round Hole"
"First, National Public Radio (through the CPB) has already
extensively studied this issue, more than anyone else in the industry,
and the results are pretty unequivocal that increasing the power of a
station's FM digital signal will adversely affect not only its own
analog host-signal, but also those of neighboring stations. So much
so, in fact, that the (first) study's coordinating engineer has
admitted in other fora that an increase in HD sideband power levels is
much more likely to do harm than good."
http://www.diymedia.net/archive/0409.htm#042909
"Warp Factor 6, Mr. Scott"
"To wit, how many existing installations will have sufficient headroom
to implement the increase without significant retooling of
transmission hardware?.. Some simply won't make it with their existing
transmitters, and plant cooling capacity will also have to be bumped
up along with electrical power mains service, and back-up generating
plant output... Those using high level combining schemes will face
similar issues, as reject loads, digital transmitters, etc., will all
have to be upsized... One thing's for certain: approval of a 6dB HD
digital boost will mean lots of extra hours, as managers and owners
task their engineers with delivering a wee bit more digital drive
without melting down already overheated corporate budgets. For many,
actually making it happen is likely to be an agonizing process."
Will never happen.
A. Nona Muss
"HD Radio Farce" <hdradi...@gmail.com> wrote in message
news:b2228d98-44d9-4329...@p36g2000vbn.googlegroups.com...
Nick Name
> On Oct 21, 2:09 pm, "Jo Jo Gunn" <vhr74a...@sneakemail.com> wrote:
>
> > Why a Full 10 dB Increase Is Necessary
>
> >http://www.radioworld.com/article/89100
>
>
> Will never happen.
Oh really?
In a development that could vastly improve HD Radio signal reception
and propel the digital radio service forward, an agreement has been
reached for an HD power increase. It would give all HD FMs a
four-fold power hike, but most stations could get an even BIGGER bump.