[Arm-allstar-irlp] MDC-1200 request

[Pres W]

I understand. It's not a great solution because of the limited
availability, but it's quite a bit more secure than DPL has become the last
few years, and once you accept the "bummer" that making the system
limited-access, it opens up some interesing aspects:

Making it a qualifier means the repeater would not broadcast the user's
code (since the path wasn't opened until the MDC itself)
Allstar users wouldn't hear it for the same reason
Also, the jammer would have to be able to hear a valid user on the input to
decode/copy the valid code, which could be changed if it becomes compromised

I know that decoding the MDC can trigger a macro or COP command. Is there a
COP command that would toggle a connection from "monitor only" to
"transceive" quickly? That would suffice.

However, cop 2 and cop 3 (System enable and disable) would not work because
both ends of the link would be cut off and thus nobody local could hear
stations to contact. Cop 36 and 37 (Foreign Link Local Output Path
Enable/Disable) seem intriguing but did not do anything when I ran "rpt cmd
40980 cop 37" at the CLI.

-Pres




On Sat, May 25, 2019, 3:29 PM David McGough <kb4fxc at inttek.net> wrote:

>
> Hi Pres,
>
> I've been pondering ways to utilize MDC-1200 coding for a while. A big
> concern is that most ham gear doesn't support it, so you're limited to
> commercial radios. Now that the MDC-1200 patents have expired, perhaps ham
> vendors will show more interest.
>
> Another thought is to try DPL coding rather than CTCSS, which might
> present a little more of a road block to the bootleggers.
>
>
> 73, David KB4FXC
>
>
>
> On Sat, 25 May 2019, "Pres W via ARM-allstar-irlp" wrote:
>
> > Hello. Since Allstar (and HAMVOIP) suppport MDC-1200 decoding, would
> > it be possible to incorporate a valid MDC-1200 burst as a third RX
> > qualifier? Meaning, without MDC-1200 the system does not pass the
> > transmission through to the Allstar network? Ideally DTMF would still
> > work without MDC, so as to be able to turn the feature on and off.
> >
> > Sadly, my system is attracting a lot of bootleggers and I'm
> > considering taking my system off East Coast Reflector. Or even worse,
> > going all digital.
> >
> > Thank you
> >
> > -Pres W2PW
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> >
>
>