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post #10501 of 10505 Old 02-05-2016, 11:22 AM
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WBBM 12 is 2-1 and 2-2, while WBBM 26 is 2-11 and 2-12. No conflict.

- Trip

N4MJC

Comments are my own and not that of the FCC (my employer) or anyone else.

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post #10502 of 10505 Old 02-05-2016, 01:22 PM
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Originally Posted by Trip in VA View Post
WBBM 12 is 2-1 and 2-2, while WBBM 26 is 2-11 and 2-12. No conflict.

- Trip
Ah, right, I should've clicked WBBM to see the detail. Suspicions confirmed: different subchannels. Thanks.
(Side note: interesting what they've done there: main CBS feed in HD and one SD aux feed on VHF, then the same CBS and aux feeds on UHF.)
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post #10503 of 10505 Old 02-06-2016, 01:45 AM
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Originally Posted by KG7OR View Post
Ah, right, I should've clicked WBBM to see the detail. Suspicions confirmed: different subchannels. Thanks.
(Side note: interesting what they've done there: main CBS feed in HD and one SD aux feed on VHF, then the same CBS and aux feeds on UHF.)
Here in the SF Bay Area there are a couple of different combinations:

14-1 (RF 51) KDTV Univision
14-2 (RF 51) KFSF Unimas

66-1 (RF 34) KFSF Unimas
66-2 (RF 34) KDTV Univision

These stations have other programming on their -3 and -4 sub-channels.

11-1 (RF 12) KNTV NBC
11-2 (RF 12) Cozi TV
48-3 (RF 12) KSTS Telemundo

48-1 (RF 49 KSTS Telemundo
48-2 (RF 49 Exitos
11-3 (RF 49) KNTV NBC

With both of these combinations, you can watch both stations even if you only receive one over the air.

KTFK 64 (RF 26) Sacramento and KUVS (RF 18) Modesto have an arrangement like KNTV/KSTS for their -2 sub-channels.
There are probably several other combinations of stations like this. And wait until after the re-pack when several stations might be sharing channels.

Larry

My complete SF Bay Area DTV Station Lists: http://www.choisser.com/sfonair.html
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Live reception scans from my HD Home Run receivers: http://www.larrykenney.com/hdhr/
Photos and info on my antennas: http://www.larrykenney.com/tvantennas.html
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post #10504 of 10505 Old Today, 08:41 AM
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Originally Posted by KG7OR View Post
One virtual channel, two actual channels:

I ran into this issue on another forum, and I bet someone here has the answer. Rabbitears shows WBBM, ch. "2" in Chicago as transmitting on both 12 and 26. If that means they are simulcasting, then......

1. How does the ATSC tuner know which channel to lock onto.?
2. If the tuner is seeing both channels simultaneously, would the two identical signals on two differing frequencies give each other phase distortion?
3. Any other insight as to how a station does this? (Same content on two or more actual channels and one virtual channel.)

Many thanks,
--Ron

It depends on how the software is written. My Sony TV will keep the last real channel it found. For example in the Bay Area if you could receive KGO on RF 7 and RF 35 it would use VC 7 and RC 35 since it found 35 last.

The tuner cannot see two stations at the same time so there's no issue with one interfering with the other. Maybe what you're thinking of is DTS that has multiple transmitters on the same channel. There can be interference issues but they try to engineer it so that few locations can receive multiple transmitters. KEMO is running such a system on channel 32 with a transmitter on Mt. St. Helena and one on Sutro Tower.

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post #10505 of 10505 Old Today, 08:03 PM
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Quote:
Originally Posted by KG7OR View Post
One virtual channel, two actual channels:

I ran into this issue on another forum, and I bet someone here has the answer. Rabbitears shows WBBM, ch. "2" in Chicago as transmitting on both 12 and 26. If that means they are simulcasting, then......

1. How does the ATSC tuner know which channel to lock onto.?
2. If the tuner is seeing both channels simultaneously, would the two identical signals on two differing frequencies give each other phase distortion?
3. Any other insight as to how a station does this? (Same content on two or more actual channels and one virtual channel.)

Many thanks,
--Ron
1. Both, unless the tuner chokes. It depends on the tuner.
2. No chance of that.
3. They do it the same way that they've done translators for decades with analog, then for digital over the last decade or so.
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