radioskeptic
Frequent Participant
@ landtuna (post # 20)
“But the 92.7 signal doesn't seem any more robust than the HD2,” you wrote.
But does it seem any less robust?
K224CJ, the analog translator on 92.7, has an ERP of 10 watts at an HAAT of 446 meters. (That’s the functional equivalent of a low-powered Class A primary station, one with 199 watts ERP at the Class A reference height of 100 meters HAAT, or about 3 dB above the minimum Class A power of 100 watts @ 100 meters).
KDKB (93.3), on the other hand, has an ERP of 100 kw at an HAAT of 508 meters. Assuming KDKB’s digital signal is at -20 dBc, it’s 1 kilowatt—still 20 dB higher than 10 watts! And KDKB’s greater antenna height gives it the equivalent of an additional 1.13 dB, for a total advantage of 21.13 dB.
Of course, if KDKB has boosted its digital signal to -14 dBc, the difference is 27.13 dB!
So if you’re saying that the coverage of the two is comparable despite the digital signal having a power advantage of at least 21.13 dB, that doesn’t say much for “HD” radio, does it?
“But the 92.7 signal doesn't seem any more robust than the HD2,” you wrote.
But does it seem any less robust?
K224CJ, the analog translator on 92.7, has an ERP of 10 watts at an HAAT of 446 meters. (That’s the functional equivalent of a low-powered Class A primary station, one with 199 watts ERP at the Class A reference height of 100 meters HAAT, or about 3 dB above the minimum Class A power of 100 watts @ 100 meters).
KDKB (93.3), on the other hand, has an ERP of 100 kw at an HAAT of 508 meters. Assuming KDKB’s digital signal is at -20 dBc, it’s 1 kilowatt—still 20 dB higher than 10 watts! And KDKB’s greater antenna height gives it the equivalent of an additional 1.13 dB, for a total advantage of 21.13 dB.
Of course, if KDKB has boosted its digital signal to -14 dBc, the difference is 27.13 dB!
So if you’re saying that the coverage of the two is comparable despite the digital signal having a power advantage of at least 21.13 dB, that doesn’t say much for “HD” radio, does it?
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