TampaTyron
Beep Boop, Beep Boop
-117 from site to subscriber is a PASS and does not need a BDA.
TT
TT
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BDA AHJ saying Public Safety RSSI is ok down to -117dBm, what am I missing?
- Thread starter TampaTyron
- Start date
TampaTyron
Beep Boop, Beep Boop
Yes, if -117 to subscriber, then no BDA needed.
Hundreds of buildings.
TT
Hundreds of buildings.
TT
prcguy
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I can't imagine doing meaningful testing at that level inside buildings. Move a foot and its gone, move another foot and its back, sort of. And you would have to use an actual subscriber radio with stock antenna. Do the subscribers hold the radios up in their hands or are the radios on the belt? Way too many variables measuring at threshold levels.
speedway_navigator
Member
I got these digital RX sensitivity ratings from a Motorola manual.
Band dBm
VHF -123
UHF -121
7-800 -119
that is in a photo for a catalog or magazine cover.
Band dBm
VHF -123
UHF -121
7-800 -119
Our county's 95% coverage guarantee with Motorola is the radio in the had at face level with the 1/2 wave antenna. About the only time I see
that is in a photo for a catalog or magazine cover.
TampaTyron
Beep Boop, Beep Boop
Well, the other issue is that the county is following the -95 and 3.0 DAQ per the IFC code (2021), but the "inspector" is applying his own code to -117.
We test a building per IFC and it fails, Inspector "Passes" the building when he comes out to "take a look as it should be ok", public safety moves into the building and radios don't work, public safety rep goes to building rep, building rep comes to us to us with a "WTF?", we show the public safety and building rep our testing and the "PASS".
Now, we are in a standoff with the AHJ, Public Safety Agencies (multiple), Inspector, and Building Owner.
We have over 1550 systems in service and sometimes they are hard to implement, but this seems ludicrous.
I guess I am just venting at this point. I really apprecaite your inputs here, thank you all.
TT
We test a building per IFC and it fails, Inspector "Passes" the building when he comes out to "take a look as it should be ok", public safety moves into the building and radios don't work, public safety rep goes to building rep, building rep comes to us to us with a "WTF?", we show the public safety and building rep our testing and the "PASS".
Now, we are in a standoff with the AHJ, Public Safety Agencies (multiple), Inspector, and Building Owner.
We have over 1550 systems in service and sometimes they are hard to implement, but this seems ludicrous.
I guess I am just venting at this point. I really apprecaite your inputs here, thank you all.
TT
That is a problem I don't think you can solve unless you do some prompting. It sucks because you do the right thing, then you get punished for it. The county needs to work with this guy or the state fire marshal needs to step in. All in the name of safety. He's not helping anyone.
speedway_navigator
Member
I see where Phoenix set specs for donor antennas, anyone else in the valley doing that?
kayn1n32008
ØÆSØ Say it, say 'ENCRYPTION'
Is that on the street or in building? It's a big difference, depending on the building materials used.
speedway_navigator
Member
The engineer did not specify but I'm assuming it was outdoors. I have seen AARs that mentioned the coverage testing was with the radio on the hip for firefighters, don't recall if that was under turnout gear.