[Scan-DC] DC FEMS UNENCRYPTS 7 a.m. Sunday!

[Luke Berndt]

I think I just saw one of the new unencrypted talkgroups! There was a broadcast on TG 717: http://openmhz.com/call/54f30c9f936e53643216a677 <http://openmhz.com/call/54f30c9f936e53643216a677>

It sounds like they are using it for EMS 2 though. 

It looks like 709 is still encrypted though...

The Daul Dynamic Mode makes sense. I am decoding the P25 Control Channel with my SDR. So far I have only seen Phase I broadcasts on the 800MHz channels, but who knows if it will stay that way. 

> On Mar 1, 2015, at 1:02 AM, Alan Henney <alan at henney.com> wrote:
> 
> 
> We’ll probably just have to wait a few hours and see what happens.  I assume the fire apparatus will be directed to 0-3 and 0-7 for the primary firegrounds.  But what happens with EMS and rescue assignments, good question.  I believe it’s possible for the network controller to “poke” some holes on the encrypted talkgroups to make them unencrypted.  So maybe we’ll see some individual talkgroups converted back?
> 
> As far as affiliating, that would be a two-way radio.  I assume some agencies still have XTS5000s which are Phase 1 but not Phase 2 capable.  If one of those affiliates on a dynamic talkgroup, it will force it to FDMA which means slightly older scanners (BCD396T) can receive it (although maybe not perfectly).  But once it switches back to TDMA, you’ll need a newer radio like the BCD436HP.
> 
> I’m under the impression that MAIN and DISP are always set to FDMA.  Any thoughts?
> 
> Only six hours to go!
> 
> Alan
> 
> From: Brian Rokus 
> Sent: Saturday, February 28, 2015 9:36 PM
> To: Eric C. Carlson ; Alan Henney 
> Cc: David Schoenberger ; ScanDC 
> Subject: RE: [Scan-DC] DC FEMS UNENCRYPTS 7 a.m. Sunday!
> 
> So I guess the follow-up question is does anybody know what the odds are of having older radios affiliated to force the FDMA fallback? 
> 
> And after Alan's very-helpful info, it seems at least to me that they aren't really fully unencrypting. For example, B-3 (where a lot of the rescue incidents seem to go) will not be open, correct? I suppose it's always possible that they will change the procedure for assigning incidents to channels.
> 
> 
>> Date: Sat, 28 Feb 2015 19:54:18 -0600
>> From: ecarlson at gmail.com
>> To: alan at henney.com
>> CC: davidschoenberger at gmail.com; scan-dc at mailman.qth.net
>> Subject: Re: [Scan-DC] DC FEMS UNENCRYPTS 7 a.m. Sunday!
>> 
>> "Dual Dynamic Mode," if enabled for specific talkgroups, will allow them to
>> revert to FDMA if FDMA radios are affiliated to the talkgroup.
>> 
>> -Eric
>> 
>> On Feb 28, 2015 6:41 PM, "Alan Henney" <alan at henney.com> wrote:
>> 
>>> Unlike MPD, I think the FEMS talkgroups are dynamic (TDMA with fallback
>> to FDMA for older radios like the XTS5000). Can anybody confirm? So you’d
>> need a new scanner and might be able to receive the FDMA (typically on MAIN
>> and DISP and on the others when they are affiliating with a Phase 1 radio).
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