[TheList] Christchurch Ambulance now digital

Wed Aug 3 14:48:28 AEST 2011

Is P25 narrow bandwidth? Trunking allows more groups to use less spectrum
allocation, ambo could use the allocated channels for police and no one
would be
the wiser. Control Channel is not picky who it allocates talk
channels too. 

On Wed, 3 Aug 2011 16:34:19 +1200, Scanhead  wrote:  

Has
coverage improved purely because its a digital signal? Or because the bands
have changed or more equipment is installed (larger network etc)? Is it
like comparing AMPS to GSM coverage wise?
 On Wed, Aug 3, 2011 at 3:27 PM,
Mike Bailey  wrote:
   "So what are the advantages of P25 over analog if
secure communication is not an issue? "

 Coverage is improved. Also, on
the fringe areas, you either have full coverage, or none at all - not the
sometimes scrambled guff we can hear now and then. Also, the radio itself
can tell you if you're in coverage or not. 

 On 3/08/2011 2:54 p.m.,
Scanhead wrote:    Perhaps the confusion is because the police are using
ESB band with P25 trunking as the replacement for ESA... Which is normally
(and probably still) where ambo operates. 
 Can anyone confirm that current
digital scanners are still not able to follow tait P25 trunked? From memory
it was to do with the data rate of the control channel (could be wrong). I
could get unencrypted voice with my uniden digital but was never able to
follow the conversation. Thats why I started looking at software radio etc.

 It is ironic that the P25 system came into being because of a need for
radio systems and services to inter-communicate, and now it is what
separates them. Some will argue that P25 radios can communicate with the
old analog systems (mixed mode), but I've been told this is not possible
with a trunked system. (again, could be wrong) 
 So what are the advantages
of P25 over analog if secure communication is not an issue?  
 Scanhead.

On Wed, Aug 3, 2011 at 12:17 PM, Neill Ellis  wrote:
 Hi Grunter,

 I think
you might be on to something. I'm pretty sure the media would have let us
know if Ambo's were trialling or had gone secure digital.

 Regards,

Neill.  

 On 3/08/2011 11:50 a.m., Grant Carroll wrote:
    Hello,
 I am
still listening to ambos on the same frequencies in the ESB band they have
been on for ages. This is on an analogue scanner and my digital scanner
with no "P25" coming up to suggest the transmissions are digital and
obviously if I can hear them on an analogue scanner they aren't. Am I
missing something here? Are they being simulcast on analogue and new
digital frequencies for now or is their going digital just a vicious
rumour?
 Cheers guys.
 Grunter1.

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