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APX Emergency Alert Timeout

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djm448

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I am researching the programming codeplug for our APX7000 portable radios for a concern we have.

I have come across in the "Emergency Configuration" section, looking at "Trunking Emergency Profile"... there is an option called "Retry Counter". Does anyone know what this means? I have looked in the Help section, online research, etc... and come up with nothing.

In my head, this is a setting on how many times you want the radio to attempt to send the Emergency Alert before it displays "Not Acknowledged".... which is where our concern is. The radio is timing out after about 15 seconds... which is what I am trying to change.


Any help is appreciated.
 

slicerwizard

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That sounds about right. 15 seconds is a long time to not get an acknowledgement. The radio is effectively out of range and extending the retry time isn't going to do much for you.
 

djm448

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That sounds about right. 15 seconds is a long time to not get an acknowledgement. The radio is effectively out of range and extending the retry time isn't going to do much for you.

Thanks for the quick reply.

Agree with the statement about being out of range. We have discovered this while conducting training in a training tower with spotty coverage. The hope is that the radio will continue to attempt the emergency alert if the firefighter is still moving and becomes within coverage.
 

KE4ZNR

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From a 2 second search in the CPS help file:

UuiI2oq.jpg
 

RKG

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Assuming use of a trunked talk group on the fireground (a no-no under NFPA 1221), there is a cost associated with stretching the Retry Counter: while the initiating subscriber is retrying the emergency transmissions, it is tying up the ISW channel, which other users need access to in order to transmit voice.
 

djm448

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Assuming use of a trunked talk group on the fireground (a no-no under NFPA 1221), there is a cost associated with stretching the Retry Counter: while the initiating subscriber is retrying the emergency transmissions, it is tying up the ISW channel, which other users need access to in order to transmit voice.

NFPA 1221 has since been changed to allow the use of trunked channels. I know there has been heavy debate regarding this topic too. Good discussions.

Will the radio continuously tie up the ISW channel until an acknowledgement is received? I have zero doubt once a console gets the emergency alert, it will quickly be acknowledged. But if the radio is out of range, then it has no effect on the ISW channel, correct?
 

djm448

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From a 2 second search in the CPS help file:

Thank you for taking the 2 seconds to assist me and those who this research will impact in the future. Perhaps I had a typo while performing the search, it's been a rough transition to night shifts this month.
 

KE4ZNR

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Thank you for taking the 2 seconds to assist me and those who this research will impact in the future. Perhaps I had a typo while performing the search, it's been a rough transition to night shifts this month.

No problem. I have been there. As much as there is to dislike about APX CPS
I do have to say I like the help files & search feature. Ain't much you can't find there. :)
Marshall KE4ZNR
 

slicerwizard

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Assuming use of a trunked talk group on the fireground (a no-no under NFPA 1221), there is a cost associated with stretching the Retry Counter: while the initiating subscriber is retrying the emergency transmissions, it is tying up the ISW channel, which other users need access to in order to transmit voice.
A radio that is retrying any inbound message (affiliation, deaff, emerg) does not saturate the inbound control channel. There are plenty of ISW slots still available for channel grant requests and so on. There are dozens of slots every second and a retrying radio might use one or two.
 
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