I have several questions about the Charleston SC Motorola TRs after reading the Phase II Report on the fire at the Sofa Store.
The report is available here - 3rd item down in the middle of the page -
http://www.charlestoncity.info/dept/content.aspx?nid=1375
<http://www.charlestoncity.info/dept/content.aspx?nid=1375>
1. At 2227 of the transcript, apparently a portable radio transmitted over a mobile radio. How is that possible?
2. At 2326 and at 2451 there were messages from unknown users. How can there be unknown users?
3. How could there be messages heard at the scene that were not heard on the tape? (this was mentioned in a footnote)
There is extensive radio information in this report.
I also have a generic question about TRS that use a control channel. When a mobile or portable trunked radio is transmitting, that radio is not able to receive traffic from the control channel at that time - correct? If an Incident Commander was transmitting a 30 second message, and someone activated their emergency button, it might take up to 30 seconds for the IC to become aware that an emergency button had been activated. Correct? (Unless he/she had a 2nd radio nearby). Everyone at the scene except the IC might know that a button had been pushed. (I am assuming that once the IC released the PTT, an alert would sound and indicate that a emergency button had been pushed.)
I used the search function here at radioreference.com but I did not find any other discussions of this Charleston report.
Peter Sz
The report is available here - 3rd item down in the middle of the page -
http://www.charlestoncity.info/dept/content.aspx?nid=1375
<http://www.charlestoncity.info/dept/content.aspx?nid=1375>
1. At 2227 of the transcript, apparently a portable radio transmitted over a mobile radio. How is that possible?
2. At 2326 and at 2451 there were messages from unknown users. How can there be unknown users?
3. How could there be messages heard at the scene that were not heard on the tape? (this was mentioned in a footnote)
There is extensive radio information in this report.
I also have a generic question about TRS that use a control channel. When a mobile or portable trunked radio is transmitting, that radio is not able to receive traffic from the control channel at that time - correct? If an Incident Commander was transmitting a 30 second message, and someone activated their emergency button, it might take up to 30 seconds for the IC to become aware that an emergency button had been activated. Correct? (Unless he/she had a 2nd radio nearby). Everyone at the scene except the IC might know that a button had been pushed. (I am assuming that once the IC released the PTT, an alert would sound and indicate that a emergency button had been pushed.)
I used the search function here at radioreference.com but I did not find any other discussions of this Charleston report.
Peter Sz