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:	post by humanbonedeathmachine at 2005-02-17 20:49:01

ill believe it when i see it. conventional radio theory dictactes that if you widen and spread the signal, that you need to up the wattage to get the same signal punch. digital doesnt mean shit if its still relying on age old technology to carry it. digital cell phones which rely on radio transmission to work dont work any better in my town than the analog sets and there are still many large areas of dead nothing zone.

let me lay something out for you. for AM radio band, 1/4 wavelength at those low freq.s is somewhere between 830+ and 125' depending at what spot on the dial you operate. the reason why i find this digital AM radio thing as counterproductive is that with the lack of space, like i said most AM recievers are around 1-5% efficient from the severely shortened antennas. some car AM radios top out about 8-9%. one thing that happens when you shorten the antenna is that its resonant bandwidth becomes narrow. especially on AM band where most recivers have no more than 10' in electrical length. one of the reasons you get good sound from FM is that at higher frequencies having a resonant 1/4 wave antenna is more practical. believe it or not a lack of antenna resonance does have a bad effect on audio when the signal strength isnt real strong. this is true for recieving and broadcasting antennas. if a radio station was to broadcast through a piece of 10' wire, wider portion of the signal wouldnt go far and the audio would be effected. most every car's FM antenna is just a 1/4wave whip. i also dont believe the thing about this digital signal on .530-1.710 mhz being interference-free when i lose reception of everything radio when i drive under a traffic light and have recieved signals from thousands of miles away on AM band.

so far the only people i see supporting IBOC digital AM radio are the people who dont really know how radio signals are made in the first place on a technical level, or people who stand to make money off of it.
i wouldnt consider an NAB tech workshop to hold much truth since they are the same people who made a fake recording of a simulated test of an LPFM station and how they would interfere so badly with large 20,000 watt blowtorches that community based 100 watt stations should not be allowed to get a license. the nab is partly behind the deregulation of the industry making open access to the airwaves a near impossible thing. to say theyre not bad is way off. them and clearchannel are like the halliburton of radio.

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