BIG 105.9 HD signal
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Thread: BIG 105.9 HD signal

  1. #1

    BIG 105.9 HD signal

    What's up with it?!? More often then not, it cuts in and out on the HD radio in my car. Reverts between HD and regular mode. What is annoying about that, is that the non-HD signal comes in louder (dunno if that is a characteristic of my radio, or if it's like that for everyone), so I will experience constant flucuations in volume. Kinda annoying. It's just on BIG, all the other HD stations that I listen to (Variety, Magic, etc.) are pretty consistent. Has anyone else experienced this?

  2. #2

    Re: BIG 105.9 HD signal

    Quote Originally Posted by transitfan
    What's up with it?!? More often then not, it cuts in and out on the HD radio in my car. Reverts between HD and regular mode. What is annoying about that, is that the non-HD signal comes in louder (dunno if that is a characteristic of my radio, or if it's like that for everyone), so I will experience constant flucuations in volume. Kinda annoying. It's just on BIG, all the other HD stations that I listen to (Variety, Magic, etc.) are pretty consistent. Has anyone else experienced this?
    All FM HD sub-channels which include HD 2 and HD 3 operate at 4% of the main channel's authorized power. WBGG 105.9's main analog channel (105.9 HD1) operates with 100kw. Four percent of 100kw is 4kw or 4,000 watts which is what the WBGG HD 2 channels operate with. And, unlike analog transmission which fades as the signal becomes weaker, digital signals suddenly "cut off" once the signal range is too weak for the radio receiver to receive the signal. This may explain why your HD 2 signal appears weak and not there at all at times while the 100kw main channel is loud and clear. Depending on your distance from the transmitter site, you are comparing a 100kw main signal verses a 4kw signal side band channel.
    Jeffrey M. 'Mark' Tillery
    J. M. Tillery & Associates, P. A.
    Email Contact: jmtillery1@aol.com

  3. #3

    Re: BIG 105.9 HD signal

    Thanks for the explanation. It seemed to be out entirely this morning (I was listening between 6:25 AM and 7:25 AM), which is OK, as I don't need the HD-2 (I already have WIOD as one of my AM pre-sets), but at least the volume was more consistent (though the flucuation is less noticeable in the AM, when the Paul and Young Ron show is on, and there is little, if any music playing).

  4. #4

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    Re: BIG 105.9 HD signal

    Quote Originally Posted by jmtillery
    All FM HD sub-channels which include HD 2 and HD 3 operate at 4% of the main channel's authorized power.
    Where can I find the percentage of HD power for specific stations and whether the LSB and USB are the same?
    Ai4i has Always Been on the Trailing Edge of Technology!

  5. #5

    Re: BIG 105.9 HD signal

    Quote Originally Posted by ai4i
    Quote Originally Posted by jmtillery
    All FM HD sub-channels which include HD 2 and HD 3 operate at 4% of the main channel's authorized power.
    Where can I find the percentage of HD power for specific stations and whether the LSB and USB are the same?
    You can find the main HD 1 ERP power specified in the station license from the FCC website. Once you have the main ERP, simply do the math calculation (4% of the main channel's ERP) and you will have the HD 2 sub-channel ERP.
    Jeffrey M. 'Mark' Tillery
    J. M. Tillery & Associates, P. A.
    Email Contact: jmtillery1@aol.com

  6. #6

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    Re: BIG 105.9 HD signal

    I'd like to know what they are using these days for a transmitter. Back when RKO put the transmitter at the Candelabra tower they had the antenna on one of sticks at the very top with fewer bays and more TPO. The transmitter was an RCA 40KW unit (dual 20KW with a combiner). It normally put 33KW into the antenna. The idea was having an antenna with fewer bays cut down on multi path. That was the theory but I don't know if it works out in practice. I have no idea what they are using now.

    Do they still have the auxiliary transmitter site on top of the old Landmark Bank Building (not sure what the building is called today).
    Out of the money demo...all the way out!

  7. #7

    Re: BIG 105.9 HD signal

    Quote Originally Posted by jmtillery
    Quote Originally Posted by ai4i
    Quote Originally Posted by jmtillery
    All FM HD sub-channels which include HD 2 and HD 3 operate at 4% of the main channel's authorized power.
    Where can I find the percentage of HD power for specific stations and whether the LSB and USB are the same?
    You can find the main HD 1 ERP power specified in the station license from the FCC website. Once you have the main ERP, simply do the math calculation (4% of the main channel's ERP) and you will have the HD 2 sub-channel ERP.
    All due respect, Dr. Tillery, but this is not accurate.

    The power level at which an FM station runs its digital carriers has nothing to do with whether it's carrying multiple streams of audio on those carriers.

    The official standard for digital power was and is -20 dBC (decibels below carrier), which translates to 1% of analog power (not of "HD-1 power," as you stated; while an HD-1 is, by definition, a simulcast of the analog signal, it's effectively a completely separate transmission path; depending on the design of a transmission system, it's entirely possible for the HD carriers to be on without any analog signal.)

    For WBGG-FM, which runs 100 kW of analog power, that means 1 kW of average digital power. Those digital carriers provide 96 kbps of data throughput, and whether that's used entirely for a 96 kbps HD-1 stream or for 64 kbps HD-1/32 kbps HD-2, or a 48/48 split, it doesn't have any direct relationship to the power level at which it's transmitted. (Nor does the addition of an extra group of digital carriers for "extended mode" operation, which allows for the use of HD-3/HD-4.)

    As stations discovered that -20 dBC (1%) wasn't enough to provide solid coverage, they petitioned the FCC to be allowed to increase digital power. Most stations can now request (and automatically be granted) Special Temporary Authority to go up to -14 dBC, or 4% of analog power, and with a demonstration that they won't cause impermissible interference, stations can go all the way to -10 dBc, or 10% of analog power, also under STA. Again, this has nothing to do with how many audio streams are being carried over those digital carriers.

    Increasing digital power can be an expensive proposition, though, often requiring new transmitters, combiners and/or antennas to replace digital systems that were only a few years old and far from being amortized. Relatively few stations have found the investment to be cost-effective.

    I do not see any STA applications in WBGG-FM's file that would suggest that the station is operating at more than -20 dBc, or 1 kW digital ERP. (To answer ai4i's question, you have to look at the station's "Application List," accessible through the FCC's own FM Query or FCCinfo.com, to find any STAs that may have been applied for/granted to cover increased digital power and/or asymmetric sideband power; and to answer Mike Sheridan's question, Clear Channel surrendered the license for the old bank building aux site a couple of years ago.)
    All kinds of good stuff over at http://www.fybush.com

  8. #8

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    Re: BIG 105.9 HD signal

    Wow, [that was] a perfectly worded answer to address all three of us...Thanks.
    Ai4i has Always Been on the Trailing Edge of Technology!

  9. #9

    Re: BIG 105.9 HD signal

    Quote Originally Posted by Scott Fybush

    All due respect, Dr. Tillery, but this is not accurate.

    As stations discovered that -20 dBC (1%) wasn't enough to provide solid coverage, they petitioned the FCC to be allowed to increase digital power. Most stations can now request (and automatically be granted) Special Temporary Authority to go up to -14 dBC, or 4% of analog power,
    I stand corrected. The bold type above which you had stated is what I was referring with regards to 4% of analog power which was explained to me by a technical consultant. As for me, I am not an engineer so I go by what my technical consultants explain to me. Perhaps, I misunderstood the exact details. Thank you for the clarification.
    Jeffrey M. 'Mark' Tillery
    J. M. Tillery & Associates, P. A.
    Email Contact: jmtillery1@aol.com

  10. #10
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    Did you know there was a new PD at Big 105.9? And Maria Milito and Ken Dashow, based at WAXQ, who voice tracked mid-days and evenings are out, and that Aly Young from WRDA/Atlanta is VT'ing mid-days? You can get to know the new P.D here at the link, http://www.allaccess.com/rock/10-que...#disqus_thread.

    I haven't listened to Big in quite a while. Reason to listen now to hear the changes.

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