The lafd website has been wrong since 2011. All radio channels became tactical channels in an effort to get away from specific names. All dispatches are now verbalized on the radio. This change was due to the fact that resources returning from a call/hospital were not able to hear if they were going to drive by another emergency incident.
I've been thinking about this as I'm positive Station 5 responded to incidents without anything being transmitted on Channel 7. If a light force or and engine respond with a RA on a medical incident would the entire dispatch be on Channel 4? I suppose that inside the station it does not matter what channel the dispatch goes out on.
Another question, if a wildland fire or swift water rescue dispatch is put out, is the entire dispatch transmission and followup (on scene, sizeup, etc.) on Channel 5 and for structure fires on Channel 9? Or, is the dispatch first transmitted on Channel 7 (south of Mulholland) and the followup on Channel 9? I suspect the initial dispatch is transmitted on Channel 7 or Channel 8 (for the Valley) and the followup is on the appropriate channel such as Channels 5 or 9 as apparatus away from quarters would either be on Channels 7 or 8.
That brings up another question. If an engine or a light force is in service and they are dispatched to an EMS call, is is transmitted on Channel 7 or 8 and at the same time on Channel 4? Do the medic units (south of Mulholland) keep their radios on Channel 4 at all times while away from quarters?
I would try to answer these questions by listening to the feeds, but the channel names don't show up on them so it is not possible to track channel use.