digitaljim6
Member
They are certainly eligible for VHF business freqs. If they are on a business/industrial freq, their only eligibility is that they are engaged in a commercial activity 90.35(a)(1). They wouldn't get special consideration for being a public-safety related organization in that radio service. To get that, they are expected to apply in the public-safety radio services. That's why they're there. If they can get consent from the other co-channel and adjacent channel licensees, they can probably find something. Practically speaking, though, if you were another ambulance company, would you agree to accept interference from one of your competitors if you had the power to say NO? Likewise, if a for-profit ambulance company asked a city or county to accept interference from them would you expect the city or county to agree?
Anyone who has imminent safety-of-life traffic always gets priority 90.403(d). "Could I get the times on my last call?" does not qualify as "imminent safety-of-life" so only part of an ambulance company's traffic would be given priority over other users. This means that the ambulance company would have to wait for existing traffic to finish before they could initiate the majority of their transmissions. Not a great scenario. This would be like putting them on a single community repeater with ten other customers.
There are other operational restrictions, like: business/industrial transmissions cannot be retransmitted (console-patched, e.g.) on a public-safety channel unless it is an imminent safety-of-life situation. Certain business/industrial bands/frequencies may have restrictions or prohibitions on airborne use.
They still have to abide by the co-channel and adjacent channel distance separation requirements (beginning at 90.171). There are power, antenna height and operational area limits, too. For example, without additional justification, they could only get a 40km (25 mi) radius area for mobile operations in VHF. That means they couldn't legally talk to their units in Woodland from a base station on Highway 50 on the top of the hill near El Dorado Hills.
They might have better luck getting a channel by going narrowband (unless your company got the last channels that would work in the area). Then, they have to think about pagers, too, as it may be difficult to find a narrowband VHF pager manufacturer. Any don't forget that one-way signalling (paging) operation is secondary to two-way voice operation 90.233.
When you're in a metro area, the days of "there's always a public-safety channel available" have been gone for a while. That's one reason why parts of 700 MHz were reallocated to public-safety.
Anyone who has imminent safety-of-life traffic always gets priority 90.403(d). "Could I get the times on my last call?" does not qualify as "imminent safety-of-life" so only part of an ambulance company's traffic would be given priority over other users. This means that the ambulance company would have to wait for existing traffic to finish before they could initiate the majority of their transmissions. Not a great scenario. This would be like putting them on a single community repeater with ten other customers.
There are other operational restrictions, like: business/industrial transmissions cannot be retransmitted (console-patched, e.g.) on a public-safety channel unless it is an imminent safety-of-life situation. Certain business/industrial bands/frequencies may have restrictions or prohibitions on airborne use.
They still have to abide by the co-channel and adjacent channel distance separation requirements (beginning at 90.171). There are power, antenna height and operational area limits, too. For example, without additional justification, they could only get a 40km (25 mi) radius area for mobile operations in VHF. That means they couldn't legally talk to their units in Woodland from a base station on Highway 50 on the top of the hill near El Dorado Hills.
They might have better luck getting a channel by going narrowband (unless your company got the last channels that would work in the area). Then, they have to think about pagers, too, as it may be difficult to find a narrowband VHF pager manufacturer. Any don't forget that one-way signalling (paging) operation is secondary to two-way voice operation 90.233.
When you're in a metro area, the days of "there's always a public-safety channel available" have been gone for a while. That's one reason why parts of 700 MHz were reallocated to public-safety.
BirkenVogt said:It may be a stupid question then, I am not that familiar with Part 90 but does it prevent a private ambulance company from using an I/B channel instead of a PW channel? It seems awfully counterproductive to not allow AMR in Sac County any channel, as opposed to giving them one they might be interfered on in the outlying areas, but at least they will have it. Some creative wording in the application might help this as well. "Applicant provides medical transport services"
Birken