[App_rpt-users] Using MDC1200 as Telemetry?

[Tony KT9AC]

Hi Pyrodox,

MDC Access mode (squelch) is possible, as well as Macro switching and 
MDC Status usage, to made detection over the air harder. This will keep 
the RX quiet until a listed code is received *every time*, including 
commands! So you can't sneak DTMF stuff in under the covers.


In /etc/asterisk/rpt.conf:
dtmfkey = yes

[mdcmacro]
; Access List when in MDC mode
I0001 = K5678  ; MDC ID 0001 will equate to 5678 DTMF code, works with 
dtmfkey above
;
; MDC ID's used for Macro switching (example macro commands)
;
IA001 = *851  ; Macro 1 - Normal Mode, Link Off, Long Tail, PL Access
IA002 = *852  ; Macro 2 - System Disable
IA003 = *853  ; Macro 3 - Remote Base up monitor only, PL Access, Short Tail
IA004 = *854  ; Macro 4 - Remote Base up transceive, MDC Access, Short Tail
IA005 = *855  ; Macro 5 - Remote Base up transceive, PL Access, Short 
Tail - Net only
;
; MDC Status
;
S0001-1 = *851;
S0001-2 = *852;
S0001-3 = *853;
S0001-4 = *854;
S0001-5 = *855;

[dtmfkeys]      ; listing of MDC1200 ID's in /tmp/mdc.log file
5678=KT9AC

Hope this helps!
Tony



On 9/13/2012 8:51 AM, Pyrodox Lion wrote:
> Hello,
>
> I've got a repeater up and running with a URIx/Asterisk/App_Rpt/ACID 
> combination...  I'm getting into features that I wanted to run the 
> setup for now, but I'm new to all the code in Asterisk.
>
> I'm wondering if I can do this:
>
> Upon receipt of an MDC1200 packet, namely the Unit ID, copy the Unit 
> ID to a variable...  Next, as the receiver should be receiving a valid 
> signal and providing the COR signal to the URIx to accept the packet 
> in the first place, and a transmission should be occurring, wait for 
> the transmission to end, and when the COR drops from the receiving 
> radio, encode an MDC1200 packet with the variable of the Unit ID 
> originally set when the system received an MDC1200 packet.
>
> I'd like to use this as a type of telemetry, where the repeater will 
> send out the MDC1200 Unit ID of the radio which keyed it on the last 
> transmission upon unkey.
>
> I was also wondering if you would be able to keep the system in a 
> non-repeating state, until it received a valid MDC1200 packet. I've 
> gotten the [mdcmacro] clause to issue a COP 2 and take it out of the 
> COP 3 system disabled state...  However the system remains enabled and 
> I don't know how to disable it again upon unkey.  I've also noticed 
> the MDC Macro will only run the first time a packet is received... 
> Afterwards it simply ignores the MDC Macro whenever it receives a 
> matching packet.
>
> Thanks for any help anyone can provide.
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