PDA

View Full Version : AM IBOC in the US, its shortcomings and how they came about


dk8cb
09-08-2006, 10:36
Hi all,

Radio World Online has an interesting commentary about the US IBOC system and its shortcomings and how they came about. Read the article here (http://www.rwonline.com/reference-room/commentary/2006.07.19-03_rw_hd_guest_barry_2.shtml). Thanks to radiointel.com for the link.
In the commentary, DRM is mentioned as a possible alternative to IBOC for the US but I doubt that the commercial AM broadcasters in the US will jump on as it would mean that they could no longer be received on current AM receivers.

Roland

tpreitzel
13-05-2013, 20:27
Although this thread is old and refers to AM IBOC, it's still appropriate to show the consequences on the AM & FM bands of the FCC's acceptance of a bride * to force this IBOC garbage on the American people. Take a good look and wince ... <sigh>

<a target='_blank' title='ImageShack - Image And Video Hosting' href='http://imageshack.us/photo/my-images/69/ibocexamplesidebands.png/'><img src='http://img69.imageshack.us/img69/9616/ibocexamplesidebands.png' border='0'/></a>

http://imageshack.us/photo/my-images/69/ibocexamplesidebands.png/

* An error which should have been the word, bribe, instead of bride. However, I like the analogy of a bride in this particular case. ;)

tpreitzel
10-09-2013, 10:46
With all due respect, the FCC needs an engineer as commissioner. Maybe, the USA wouldn't be saddled with IBOC if the latter requirement was enforced.

I have two suggestions for improving MW's acceptance in the USA:

1. Remove iBiquity's monopoly on digital broadcasting on the MW and FM bands in the USA by allowing Digital Radio Mondiale and other digital standards to compete with IBOC on these two bands. Why not encourage digital formats as used in VOA's radiogram as well?

2. Mandate the FCC Commissioner be an engineer, not an attorney.

If Pai pushes IBOC, then the MW band will wither even faster. Every weekday, my hybrid LPAM broadcast consists of MFSK-32 mixed with analog audio. It would certainly be nice and convenient for listeners and viewers if manufacturers incorporated decoding of MFSK-32 and MFSK-64 into their receivers along with displays capable of decoding images broadcast in those formats. In one of the comments to the article below, a reader mentioned that they'd prefer to READ news rather than hear it which a digital mode would enable.

http://www.nytimes.com/2013/09/09/us/a-quest-to-save-am-radio-before-its-lost-in-the-static.html?hp&_r=2&

F1BJB
10-09-2013, 19:38
Interesting link thanks.
Readers comments are nice too.
I believe the use of medium wave AM is very different in the US and in Europe
Here it is very little used at home but much more when travelling in a country with a different
language.
Consequently car radios are the only decent AM receivers still available
And a 50KW station is a low power one.
Far away reception is only possible at night and spending it in the car isn't ideal .
In case of flood bringing the car radio on the roof can be a problem too :)
I think in case of emergency good AM and FM battery operated radios is important.
And for a country whose future once depended on the voice of general De Gaule on the BBC
we are rather short minded.