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#1
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One-second delay of KCBS 740 after KFRC-FM 106.9
KCBS 740 San Francisco "simulcasts" on KFRC-FM 106.9. I put simulcast in
quotes because I notice the broadcast coming from KCBS is about one second behind KFRC-FM. This is a consistent behavior over many months, not something randomly happening on a particular day. Is there a legal or technical reason why this might be the case? -- Charles Belov Please reply to newsgroup |
#2
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One-second delay of KCBS 740 after KFRC-FM 106.9
In article , Charles Belov wrote: KCBS 740 San Francisco "simulcasts" on KFRC-FM 106.9. I put simulcast in quotes because I notice the broadcast coming from KCBS is about one second behind KFRC-FM. This is a consistent behavior over many months, not something randomly happening on a particular day. Is there a legal or technical reason why this might be the case? It would be technical. First question: are you listening to an analog or digital radio? BTW, you might increase your chances of someone who knows the situation responding if you post your question to the Bay Area broadcasting groups, ba.broadcast and ba.broadcast.moderated. Patty |
#3
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One-second delay of KCBS 740 after KFRC-FM 106.9
On 11/5/15 10:45 AM, Patty Winter wrote:
In article , Charles Belov wrote: KCBS 740 San Francisco "simulcasts" on KFRC-FM 106.9. I put simulcast in quotes because I notice the broadcast coming from KCBS is about one second behind KFRC-FM. This is a consistent behavior over many months, not something randomly happening on a particular day. Is there a legal or technical reason why this might be the case? It would be technical. First question: are you listening to an analog or digital radio? BTW, you might increase your chances of someone who knows the situation responding if you post your question to the Bay Area broadcasting groups, ba.broadcast and ba.broadcast.moderated. Patty Thank you for the recommendation; cross-posted to the two Bay Area groups. The radio is analog. I can switch between a stored AM station (740) and a stored FM station (106.9) instantly by pressing the AM or FM button. -- Charles Belov Please reply to newsgroup |
#4
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One-second delay of KCBS 740 after KFRC-FM 106.9
On 11/05/15 9:36 PM, Charles Belov wrote:
On 11/5/15 10:45 AM, Patty Winter wrote: In article , Charles Belov wrote: KCBS 740 San Francisco "simulcasts" on KFRC-FM 106.9. I put simulcast in quotes because I notice the broadcast coming from KCBS is about one second behind KFRC-FM. This is a consistent behavior over many months, not something randomly happening on a particular day. Is there a legal or technical reason why this might be the case? It would be technical. First question: are you listening to an analog or digital radio? BTW, you might increase your chances of someone who knows the situation responding if you post your question to the Bay Area broadcasting groups, ba.broadcast and ba.broadcast.moderated. Patty Thank you for the recommendation; cross-posted to the two Bay Area groups. The radio is analog. I can switch between a stored AM station (740) and a stored FM station (106.9) instantly by pressing the AM or FM button. Charles, KCBS-AM and KFRC-FM not only simulcast, but they each have an "HD" (aka IBOC) digital simulcast. (Their top-of-the-hour legal ID says "KCBS-AM and HD, KFRC-FM and HD1, San Francisco" etc.) Because there is a need to buffer the digital stream, a delay is introduced of around 8 seconds. Then in order not to jump forward or backward 8 seconds in time as the receiving radio switches between analog and digital, stations delay their analog audio by the equivalent 8 seconds later in their audio chain, so the transitions are relatively seamless. It may be that the delay between the AM version of IBOC has a slightly different delay than the FM version, which would account for the one second difference. Few stations simulcast on AM and FM, but even fewer are running HD on AM anymore. KCBS is the exception in the Bay Area, and because of that the difference in delay is noticeable. (I've also noticed that one second delay difference when switching between 740 and 106.9 in my analog car radio, and I hear the switch-to-digital and fall-back-to-analog phenomenon in cars with HD radios.) Maybe one of our colleagues in this group would be willing to get deeper into the weeds about this. |
#5
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One-second delay of KCBS 740 after KFRC-FM 106.9
"Neil" wrote
Maybe one of our colleagues in this group would be willing to get deeper into the weeds about this. Or not. Who cares? It likely doesn't even matter enough to KCBS engineers to bother with fixing it. After all, a person is going to listen to the AM or the FM. They're not going to be switching back and forth, or if they do need to pick up one instead of the other due to signal levels, they're only going to do it once or twice. I think KCBS decided to simulacast on the FM just to pick up audiences that normally don't listen to AM at all because the AM blankets the entire coverage area of the FM with a far stronger signal than the FM. (I'm comparing AM's 50kw real power to FM's 80kw ERP, much of which sails right over the local area.) --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#6
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One-second delay of KCBS 740 after KFRC-FM 106.9
On 11/6/2015 5:38 PM, David Kaye wrote:
I think KCBS decided to simulacast on the FM just to pick up audiences that normally don't listen to AM at all True, and the strategy has worked as intended. Mark Howell |
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