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Hi Leif,
Could we please have a 4.5 KHz Bandwidth Option to cater for AM use (ITU-R Recommendation. 328-5)
This will allow for Breakaway to be used for AM Broadcasting in 9 KHz channel separation areas such as Europe and Australia.
Cheers,
Matt
[quote author=”Leif”]Ugh, now that’ll sound real good 🙂. Fine, I’ll put it in.
///Leif[/quote]
It may not be necessary. I believe the ITU spec was based on a rather gradual analog low-pass filter, and therefore with a sharp digital "brickwall" filter, additional audio bandwidth can be employed without exceeding the ITU spec. The Optimod 9300 brochure mentions "The 9300’s output power spectrum is so tightly controlled that stations in Europe are able to operate with filtering as high as 6.0 to 6.5 kHz while still complying with ITU-R/EBU occupied-bandwidth regulation! This greatly improves the received sound as compared to conventional 4.5 kHz filtering." And I do know that most AM stations in the U.K. transmit 6 kHz audio (at least on Mediumwave; Longwave may be different).Indeed. That was actually my reasoning for leaving it out in the first place. However, it’s now in already, to give people freedom to follow specs to the letter and ruin their sound as they see fit 🙂.
I’m also aware of certain users setting the low pass filter for FM to 15 kHz even though Breakaway’s 16 kHz default option protects the pilot better than analog processors ever did. One can only do so much..
///Leif
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