October 5, 2014 at 7:21 am #2704
If you’re talking about WBBM-TV, they broadcast analog on Ch2 and digitally on VHF Ch. 3 from March 2009 until the analog shut off in June 2009, then in the all digital environment moved to VHF 12. During that time period, the dial was jammed with stations operating on both of their assignments, one analog and one digital, often on adjacent channels. The presence of low band analog signals around the country made any reception “test” pretty much useless in many markets. Many situations like the aforementioned were pretty ugly.
http://transition.fcc.gov/dtv/markets/maps_current/Chicago_IL.pdf You can scroll through and see analog vs digital but the digital is the final DTV channel, not the interim ones.
This is the list of interim DTV assignments
http://transition.fcc.gov/Bureaus/Engineering_Technology/News_Releases/1998/et8002a.txt You can scroll through this and find quite a few situations similar to the Chicago one, where a station’s analog and interim digital assignments are adjacent low VHF channels.October 6, 2014 at 5:56 pm #2705Alfredo_TParticipant
One thing that is a real bummer for those wanting to broadcast DTV on the low VHF channels is that most of the newer antennas marketed as “DTV antennas” are not designed for low VHF. Some of the designs are even exclusively UHF! 🙁
On a side note, I was trying to put new F-connectors on an old segment of Radio Shack RG-6 cable, and I was in for a really bad surprise concerning its build quality. The shield is a metallized plastic film with two strands of aluminum wire running along the length of the cable. It is very difficult to make a stable ohmic connection to the shield. I don’t want to throw this stuff away, but I have my doubts about how stable this stuff is going to be if I use it outside.October 10, 2014 at 5:22 am #2706
Just noticed tonight that 103.3 has a HD-3 subchannel, carrying “Air 1” Programming… how long have they been doing this? My Sangean HDT-1 reports that it is in HD Mode MP3 rather than HD Mode MP1 for other Portland HD channels. MP3 mode picks up a little more space for digital carriers by encroaching more into the analog signal width.October 10, 2014 at 5:23 am #2707
Isn’t that to feed a translator?October 10, 2014 at 5:34 am #2708washnotoreParticipant
My Insignia HD Radio Armband. Can’t even hold the HD-3 signal on KKCW.October 10, 2014 at 5:47 am #2709
“My Insignia HD Radio Armband. Can’t even hold the HD-3 signal on KKCW”
noticed the same thing on Insignia NS-HD01 “armband” and NS-HDRAD portable… HD-3 in this mode seem “weaker” than HD-1 or HD-2 channels.
“Isn’t that to feed a translator?”
Seems to match up to 92.7, although 92.7 is ahead of the HD-3 channel by about 45 seconds, or so.October 10, 2014 at 6:04 am #2710
Unless they are stealing a little bandwidth from HD-2, HD-3 is only 12 kbs intended for mono voice, is it not?October 10, 2014 at 6:24 am #2711
IIRC, the added bandwidth can’t be combined with the lower mode bandwidth… been a long time since I looked at the Ibiquity “white papers”.
Anyway, it does not sound very good.October 10, 2014 at 6:35 am #2712semoochieParticipant
I was thinking that they might be 24 each. The Smooth Jazz station doesn’t sound as good as it used to.October 10, 2014 at 4:01 pm #2713field_strengthParticipant
EMF’s 96.3 translator has moved to 103.7 as K279BO. The translator is airing a country format called “Tailgate Country”, operated by iHeart but still owned by EMF. It uses 99 watts directional, sharing an antenna with 102.3.October 10, 2014 at 4:22 pm #2714washnotoreParticipant
Tailgate Country is also broadcasting on KFBW 105.9 HD-3 channel.October 10, 2014 at 4:31 pm #2715
My tuner sez KFBW 105.9 is *now* operating in HD service mode MP3. The added HD-3 channel seems to be *weaker* than the HD-1 and HD-2 channels from 105.9… I believe that the channel added in MP3 mode has less robust error correction.October 10, 2014 at 5:35 pm #2716chrisweissParticipant
MP3 mode just adds extra carriers closer to the analog carrier. The added bandwidth is in its own ‘container’ so you can’t rob bandwidth from the previous carriers to even out the numbers. In our case, the HD1 is 48 kbps, HD2 is 32 kpbs, and the HD3 is 24 kbps. Unfortunately, because the new carriers are closer to the analog signal, and we are feeding the analog and digital with separate transmission chains, the HD3 carriers are very susceptible to getting stepped on by the analog signal.October 10, 2014 at 6:44 pm #2717
Thanks, Chris!!October 10, 2014 at 6:59 pm #2718
Four FM allocations in Oregon were auctioned off in Auction 93 and have thusly been removed from the Table Of Allotments.
Grants Pass 257A
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