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Analog airchecks of iboc stations

L

LinoNYC

Guest
I see that the usual suspects are claiming how iboc "ruins" the analog carrier's fidelity.

So, in the interest of truth and for those who have just "tuned-in" to this discussion I give you an aircheck just recorded from a 1974 KLH wideband AM tuner.

http://www.sendspace.com/file/k9kic1 4mb mp3@320k

Stations in order: WCBS-am then WOR on to WFAN (remarkably good audio on this one) and finally, as a control it's over to WEPN which is not iboc equipped.

I tuned around each station to show that the iboc was on except for 'EPN ofcourse.

Lino
 
The destruction of fidelity when AM analog frequency response is reduced by HD radio from 10 kHz to 5 kHz and adding digital hiss at -13 db below carrier is obvious even on cheap AM radios. Just read the numerous complaints right here.
Even HD radio's most avid supporter Clear Channel admits this is true.

For the noise instance:

Self interference to the host analog station is 3 dB worse, since both
sidebands are present within the host envelope. The total RMS energy in
the two digital sidebands, combined, is 13.2 dB below unmodulated
carrier within the host channel envelope
Click to expand...

Source link:
http://www.am-dx.com/iboc_power.htm
 
SUPERCASTER said:
The destruction of fidelity when AM analog frequency response is reduced by HD radio from 10 kHz to 5 kHz and adding digital hiss at -13 db below carrier is obvious even on cheap AM radios. Just read the numerous complaints right here.
Even HD radio's most avid supporter Clear Channel admits this is true.

For the noise instance:

Self interference to the host analog station is 3 dB worse, since both
sidebands are present within the host envelope. The total RMS energy in
the two digital sidebands, combined, is 13.2 dB below unmodulated
carrier within the host channel envelope
Click to expand...

Source link:
http://www.am-dx.com/iboc_power.htm
Click to expand...

Gee, didn't you recently claim that it was "26db below"? whatever, don't let truth stop you.

Lino
 
LinoNYC said:
SUPERCASTER said:
The destruction of fidelity when AM analog frequency response is reduced by HD radio from 10 kHz to 5 kHz and adding digital hiss at -13 db below carrier is obvious even on cheap AM radios. Just read the numerous complaints right here.
Even HD radio's most avid supporter Clear Channel admits this is true.

For the noise instance:

Self interference to the host analog station is 3 dB worse, since both
sidebands are present within the host envelope. The total RMS energy in
the two digital sidebands, combined, is 13.2 dB below unmodulated
carrier within the host channel envelope
Click to expand...

Source link:
http://www.am-dx.com/iboc_power.htm
Click to expand...

Gee, didn't you recently claim that it was "26db below"? whatever, don't let truth stop you.

Lino
Click to expand...

No. I claimed the 2 tertiary AM HD radio sidebands were -26 dbc directly below the 0 to 5kHz modulation main analog carrier modulation. The combined effect of the added noise and fidelity destruction of the 2 tertiary sidebands along with adjacent sidebands on the analog audio is much greater.

Truth and support for HD radio are not compatible any more then HD radio is compatible with analog radio.

The continuing hype and deception campaign by HD radio proponents are transparent. The public is not buying this HD radio swill.
 
No. I claimed the 2 tertiary AM HD radio sidebands were -26 dbc directly below the 0 to 5kHz modulation main analog carrier modulation. The combined effect of the added noise and fidelity destruction of the 2 tertiary sidebands along with adjacent sidebands on the analog audio is much greater.

Truth and support for HD radio are not compatible any more then HD radio is compatible with analog radio.

The continuing hype and deception campaign by HD radio proponents are transparent. The public is not buying this HD radio swill.
Click to expand...

The airchecks that I have posted give lie to all of what you have written, the new devices are beginning to appear and a next generation of chips is on the horizon.

Lino
 
LinoNYC said:
No. I claimed the 2 tertiary AM HD radio sidebands were -26 dbc directly below the 0 to 5kHz modulation main analog carrier modulation. The combined effect of the added noise and fidelity destruction of the 2 tertiary sidebands along with adjacent sidebands on the analog audio is much greater.

Truth and support for HD radio are not compatible any more then HD radio is compatible with analog radio.

The continuing hype and deception campaign by HD radio proponents are transparent. The public is not buying this HD radio swill.
Click to expand...

The airchecks that I have posted give lie to all of what you have written, the new devices are beginning to appear and a next generation of chips is on the horizon.

Lino
Click to expand...

Your airchecks proove nothing.

First, review by others on this board of airchecks posted by HD supporters have shown that the very high quality claimed for the HD radio airchecks is a myth.

Second, airchecks can be faked, doctored, or not made under the conditions or location described. Some doctored or misrepresented "HD radio airchecks" have been posted here by HD supporters.

Third, even when the first or second cases don't apply, these HD radio "airchecks" only represent one persons experience, at their location, at one time, and with their selected equipment and conditions. To represent such an aircheck as a usual or typical HD radio reception for most listeners is deceptive.

The next generation of HD radio chips are intended to reduce power consumption and do not address, refute or circumvent the basic physical limitations, deficiencies, and defects of the HD radio system itself.
 
Yeah, my airchecks (and others) which most described as spectacular, has quality that's "a myth" to Supercaster. "Analog is better", "Long live LP", "Long live hissy tape", "Long live analog-only audio". Bye-bye audience, which is used to ZERO noise, perfect separation, and wide-open highs from every source that's gone digital.

I repeat...who says dinosaurs are extinct?
 
Congratulations, Lino for making another incredibly good recording from a very, very good sounding tuner.

I can hear as you are making critical adjustments in tuning, and exactly how high the response is on the tuner when you're not tuned in.

I draw exactly the opposite conclusions however, and find your recording supports the iBOC detractors' position.

Each of these iBOC stations comes pre-interfered with, and the non-iBOC control station, a "sports yap", sounds
great by comparison!

If you can hear well enough to tune critically to minimize the hiss, how can you not be tormented by the
considerable remaining hiss, and the limited audio passband ( though they're getting better on this).

RF Burns limited the high end on his his analog/iboc recordings but yours are high-quality documentation.
 
Tom Wells said:
Congratulations, Lino for making another incredibly good recording from a very, very good sounding tuner.

I can hear as you are making critical adjustments in tuning, and exactly how high the response is on the tuner when you're not tuned in.

I draw exactly the opposite conclusions however, and find your recording supports the iBOC detractors' position.

Each of these iBOC stations comes pre-interfered with, and the non-iBOC control station, a "sports yap", sounds
great by comparison!

If you can hear well enough to tune critically to minimize the hiss, how can you not be tormented by the
considerable remaining hiss, and the limited audio passband ( though they're getting better on this).

RF Burns limited the high end on his his analog/iboc recordings but yours are high-quality documentation.
Click to expand...

I have stayed out of this site and will continue to do so, but don't tell stories about what I did or did not do. I did no audio limiting on my samples. What you heard is just how these stations sound on my radio.
 
Mr Burns,
I did not mean to imply you intentionally limited it, though it does read that way. I apologize.
Your tuner or radio did indeed have a different response characteristic, and I think your
recordings might have been previous to whatever improvements were rolled out in August.

Good to see you are still well.
 
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