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Old 12-06-2012, 6:27 PM
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Default Air Ambulance Communication Update

As of January 1, 2013, the Very High Frequency (VHF) for communications between air ambulances and ground crews will move to 155.3475. This change was made due to the high volume of traffic on the previous frequency. Additionally, the Alabama Forestry Commission has designated an Ultra High Frequency (UHF) 453.750 for those agencies with UHF radios to conduct Air Ambulance communications and landing zone coordination.
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Old 12-07-2012, 7:14 PM
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Thanks for posting this and updating the database.

I did not know about the UHF frequency being allocated as well. That makes perfect sense as 453.750 seems to be the standard talkaround or fireground frequency for the many fire departments on the Forestry RCFP system. If the RCFP fireground channel uses a common tone across counties, or is CSQ, then radios on the system will not have to be reprogrammed just to add the new UHF Air Ambulance Net.

The VHF Air Ambulance Net should be very useful also. In addition to decreasing the amount of traffic on the HEAR system, it is being pushed as the standard statewide channel for ground units to interop with EMS helicopters. I suppose the HEAR channel (155.340) was originally supposed to be used for this purpose, but in my experience only a few EMS agencies used it as such. On scene flights, most communications centers in my area direct EMS helicopters to use the local departments primary channel, often with mixed results. Having one statewide channel should dramatically streamline things, and flight crews will no longer have to worry about what the "Old analog West fire repeater", or the "New Podunk fireground channel" is.

Unfortunately, the new frequency(s) was not really publicized. Marion County did not know anything about it until October, when an Air-Evac spokesman came to a fire association meeting and discussed it. Thankfully, this was just a few weeks before we narrowbanded all of the fire department radios in the county; so we simply added the channel then. Walker County, on the other hand, had already converted to narrowband before they found out about it; and did not want to pay to have their 300+ fire radios reprogrammed again just to add the new channel. I don't know how many other counties did or did not add the channel to their radios.

In reference to the RR database, the new frequencies (and indeed all of the channels on the "Common/Shared" page) are narrowband FM (FMN), instead of wideband (FM). I don't know for sure about the UHF channel, but the VHF Air Ambulance Net is carrier squelch.
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Old 12-07-2012, 8:21 PM
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Thanks for sharing. I've made the changes.
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Old 12-28-2013, 11:21 PM
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I know this is an old post. I went back through today and added the remaining HEAR frequencies. I didn't realize I missed so many the first time around. Should be good to go now.

Also you will notice a few frequencies were moved from the county pages to the state page or up to the national listing per the RR policy. The database was getting saturated with duplications. There are a few more adjustment coming. If you have any questions, shot me a PM.

http://falconinfo.blogspot.com/2012/...quency-in.html
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Last edited by wise871; 12-29-2013 at 12:13 AM..
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Old 01-02-2014, 9:21 PM
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The problem with this plan is that if 155.340 is too busy then 155.3475 is probably going to be unusable due to it being an adjacent channel.

In Morgan Co, we use 155.145 simplex (no PL) and the dispatchers patch it to the appropriate talkgroup or conventional channel as needed.
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Old 01-03-2014, 2:45 AM
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I still hear Lifeflight and Airheart use the State Net 155.010 more than 155.340.
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Old 01-04-2014, 8:50 AM
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Morgan:

you took the words right out of my mouth. why in the world would they choose this freq.
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Old 01-04-2014, 7:28 PM
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All I can say is that the decision was likely made by a non-technical person.

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Morgan:

you took the words right out of my mouth. why in the world would they choose this freq.
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Old 01-04-2014, 8:20 PM
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Chosen likely because in the over-all Interop Scheme you only have two Choices in VHF for Medical Interops http://publicsafetytools.info/nifog_...l_printing.pdf

VMED28 aka 155.3400 and VMED29 aka 155.3475

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All I can say is that the decision was likely made by a non-technical person.
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