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#1
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Yeah, but Riverside is in KTNQ's null - where their day pattern has the equivalent of about 6kW, NOT 50kW. The KTNQ day pattern runs 6kW or less over most of the ESE quadrant. They have far less toward Riverside at night. And Riverside is in the max of 1050's day pattern. Presumably the 1020 IBOC pattern is proportional to the main signal's pattern. I wouldn't presume that. Most ATUs and phasors are designed for the carrier frequency. The fact that a transmitter may also transmit audio sidebands is a secondary issue. IBOC splatter was certainly not taken into consideration in the design of nearly, if not all, of the phasors in use today. Bob Radil A ?subject=NewsgroupRes ponse" E-Mail /A |
#2
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"Bob Radil" wrote in message ... Yeah, but Riverside is in KTNQ's null - where their day pattern has the equivalent of about 6kW, NOT 50kW. The KTNQ day pattern runs 6kW or less over most of the ESE quadrant. They have far less toward Riverside at night. And Riverside is in the max of 1050's day pattern. Presumably the 1020 IBOC pattern is proportional to the main signal's pattern. I wouldn't presume that. Most ATUs and phasors are designed for the carrier frequency. The fact that a transmitter may also transmit audio sidebands is a secondary issue. IBOC splatter was certainly not taken into consideration in the design of nearly, if not all, of the phasors in use today. The KTNQ phaser and ATUs were carefully, and at great cost, redesigned for IBOC. Your observation is correct for most stations, however. |
#3
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In article , Bob Radil wrote:
I wouldn't presume that. Most ATUs and phasors are designed for the carrier frequency. The fact that a transmitter may also transmit audio sidebands is a secondary issue. This is unfortunately true, and it's also one of the more important sources of lousy sound for AM broadcasters. Low group delay across the antenna system really _is_ important for good clean analogue audio. IBOC splatter was certainly not taken into consideration in the design of nearly, if not all, of the phasors in use today. IBOC now requires low group delay across an even wider frequency range. My hope personally is that stations will be forced to upgrade their phasing networks and antenna systems in order to implement IBOC-AM, which will then fail, leaving them with wider band antenna systems that result in higher analogue audio quality. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#4
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Unfortunately those improved wider band antenna systems will only be passing
analog audio that has been hard band limited to frequencies below 5 kHz to be compatible with the IBOC data carriers. "Scott Dorsey" wrote in message ... In article , Bob Radil wrote: I wouldn't presume that. Most ATUs and phasors are designed for the carrier frequency. The fact that a transmitter may also transmit audio sidebands is a secondary issue. This is unfortunately true, and it's also one of the more important sources of lousy sound for AM broadcasters. Low group delay across the antenna system really _is_ important for good clean analogue audio. IBOC splatter was certainly not taken into consideration in the design of nearly, if not all, of the phasors in use today. IBOC now requires low group delay across an even wider frequency range. My hope personally is that stations will be forced to upgrade their phasing networks and antenna systems in order to implement IBOC-AM, which will then fail, leaving them with wider band antenna systems that result in higher analogue audio quality. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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