Montgomery County PSSM Program update

[Bjc123]

I just got a transmission on TG 6420 that was clearly encrypted.

EDIT: So I have no clue what they were saying

 

[Bjc123]

So based off of mocomdcitizen 's post I listened to the files and TG 6015 had 9-Zebra-15 ( Accidently talking on it ) and he said his callsign multiple times and then he said 9-Zebra-15 on 4D....... Soooo... I think it's safe to think that TG 6015 is *Possibly* 4D Dispatch?

EDIT: I forgot to add TG 6595 also had a unit L20 calling Rockville which is what MSP calls their dispatch so possibly a MSP Channel?

 

[maus92]

You are suggesting a scenario that I hadn't thought about - maybe the MC unit switching to a zone / channel position that *used * to be where Frederick County tgs lived...

I was suggesting that Frederick County ECC may be "patching" their tgs to the new MC tg, maybe in error, maybe practicing. Or MC ECC doing the reverse.

The channel plan and system specifics have been developed way in advance, so it's really a matter of the counties coordinating with their system vendor to make the necessary changes. Not sure if Frederick County has the ability to do OTAP for the subscribers; newer systems do have the option available, as well as WiFi reprogramming. The SmartZone system in Montgomery does not do OTAP, thus the need to physically touch the subscribers. Once the system moves over to P25, I would assume they would use OTAP / OTAR or even WiFi - if they purchased the option and made the infrastructure investments. The advantage of WiFi is that it is very fast, and doesn't use channel resources. The disadvantage it requires another layer of management.

 

[Bjc123]

Maus92 - it's strange because the units who accidentally transmit on the P25 system keep trying to call right? So Its strange that the Engine 9** never tried calling multiple times it's almost like he got a response somehow? so maybe they monitoring the new system possibly?

Does that make sense?

 

[maus92]

Maus92 - it's strange because the units who accidentally transmit on the P25 system keep trying to call right? So Its strange that the Engine 9** never tried calling multiple times it's almost like he got a response somehow? so maybe they monitoring the new system possibly?

Does that make sense?

Disclaimer - I haven't listened to the recordings.

If the Frederick County unit was operating on a FC tg, then everything would seem normal to them when / if the MC ECC patched tgs together. It would be interesting to hear what was being said on the SmartZone system at the time of the call. Does Montgomery tell mutual aid units to switch to Frederick County tgs?

 

[maus92]

So based off of mocomdcitizen 's post I listened to the files and TG 6015 had 9-Zebra-15 ( Accidently talking on it ) and he said his callsign multiple times and then he said 9-Zebra-15 on 4D....... Soooo... I think it's safe to think that TG 6015 is *Possibly* 4D Dispatch?

EDIT: I forgot to add TG 6595 also had a unit L20 calling Rockville which is what MSP calls their dispatch so possibly a MSP Channel?

Maybe. Keep it in your notes.

 

[Bjc123]

So he was responding to an accident in MoCo and he said "Engine 923 is responding on 7B" So I think its likely that he just thought he was on the "correct" 7B but was actually on the "new" 7B

So he was trying to reach Montgomery Dispatch.

Then he switched to the correct 7B

 

[mocomdcitizen]

Here's the entire dump of unencrypted transmissions (trunk-recorder can only record unencrypted) since December 12th until today.

Just a note: the way trunk-recorder handles local recordings is to record to WAV first then convert to M4A and generate a JSON - that's why there's duplicate audio files - so that it's ready to be accepted on OpenMHz.com.

https://drive.google.com/file/d/19ElZhW3gkEK1YdeEvBaqXOEkcMhqTeJA/view?usp=sharing

---

Edit: updated Google Drive link URL

 

[Bjc123]

So just for everyone here is what I *Think* is safe to say so far...

TG 6015 = Sometype of 4D channel
TG 6595 = Something MSP ( Maryland State Police ) Related
TG 4000 = 7A1 Ops1 ( 7B )
TG 4005 = 7A2 Dispatch

Again I am not 100% sure I am just basing this off of the radio recordings that MocoMdCitizen supplied.

I will listen to more of the stuff you just sent and see if I can determine anything else

Thanks again for the recordings they help a ton!

Let me know if you guys think differently

 

[maus92]

So he was responding to an accident in MoCo and he said "Engine 923 is responding on 7B" So I think its likely that he just thought he was on the "correct" 7B but was actually on the "new" 7B

So he was trying to reach Montgomery Dispatch.

Then he switched to the correct 7B

Sounds like the new programming is already in FC radios.

Here in AACo, we refer to tg by phonetic knob positions indications: the channel position is lettered rather than numbered. The north battalions (1/2) ops tg is knob position B, so the dispatcher will tell units assigned to "respond on talkgroup Bravo." Does Montgomery use lettered knob positions on their subscribers? Sounds like they are changing to numbered channel positions: 7A1 = "Alpha 1;" 7A2 = "Alpha 2?"

EDIT: I changed Bravo to Alpha in the last sentence.

 

[Bjc123]

So I am kinda confused about what your asking but they would say

Respond on 7B
Respond on 7C
Respond on 7G

7C and 7G are incident channels and 7B is like the ops channel. So They say like 7B

 

[maus92]

So I am kinda confused about what your asking but they would say

Respond on 7B
Respond on 7C
Respond on 7G

7C and 7G are incident channels and 7B is like the ops channel. So They say like 7B

Right, but that will change based on the limited info mentioned earlier in the thread.

7= MWCOG jurisdiction
A = subscriber zone
1 = knob position / channel number

New 7A1 Ops 1 = old 7B Ops
New 7A2 Disp = old 7A Disp
New 7A3 Ops 3 = no equiv
New 7A4 Inc 1= old 7C Inc 1

and so on... Basically the tg knob positions are now referred to numerically rather than by letter.

So "E733 respond on 7Alpha1" instead of "E733 respond on 7Bravo."

 

[Bjc123]

Okay I understand now sorry.... I am not part of MCFRS so I have no clue how they are going to dispatch the channels. I feel like it probably will be "Respond on 7A1" based on how they currently say PG "Respond on Prince Georges 8A2"

But like I said I am not part of MCFRS so I could be wrong someone else can provide a better answer

 

[maus92]

So just for everyone here is what I *Think* is safe to say so far...

TG 6015 = Sometype of 4D channel
TG 6595 = Something MSP ( Maryland State Police ) Related
TG 4000 = 7A1 Ops1 ( 7B )
TG 4005 = 7A2 Dispatch

Again I am not 100% sure I am just basing this off of the radio recordings that MocoMdCitizen supplied.

I will listen to more of the stuff you just sent and see if I can determine anything else

Thanks again for the recordings they help a ton!

Let me know if you guys think differently

It looks like tgs will be incremented by 5. Pretty much holding as I browse through the logs.

Enc TGs I've logged:

6420
6305
6290
6300
4060
6070
7610
6055
5260
7640
7635
6125
4055
3675
6300
7630
3595

Also attaching a log file in excel format.

 

[mocomdcitizen]

TG 6410 - "I think we can still use the old channels until December 31st"

Not a definite indication of the switchover, but based on previous piecemeal info we have in this thread, we're definitely a few weeks away. Whether it's a gradual transition for all services (seems likely the case) or full switch.

EDIT: this came in at around 11:55am today. Earlier transmissions just before it sound like police dispatch, not sure the district, calling out to 2 John unit for a return/checking welfare. Attached that recording in a ZIP file marked with "a" at the end.

 

[Bjc123]

okay I think I found a common pattern

I feel like 4D is 6015

I then heard a
Charlie unit ( 1D ) on 6000
Delta Unit ( 2D ) on 6005
and it keeps going... 6010 6015

So I think that what they did is

1D: 6000
2D: 6005
3D: 6010
4D: 6015
5D: 6020
6D: 6025

other channels that I heard are

M-NCPPC Park Police: 6475
MSP Rockville: 6595
Animal Services: 6220


Fire Channels:

7A1 OPS1: 4000
7A2 DISP: 4005



Again I have no "inside" Infomation I am just getting this information from the recordings so I could be wrong but I feel confident that these are close to correct.

 

[Bjc123]

TG 6410 - "I think we can still use the old channels until December 31st"

Not a definite indication of the switchover, but based on previous piecemeal info we have in this thread, we're definitely a few weeks away. Whether it's a gradual transition for all services (seems likely the case) or full switch.

EDIT: this came in at around 11:55am today. Earlier transmissions just before it sound like police dispatch, not sure the district, calling out to 2 John unit for a return/checking welfare. Attached that recording in a ZIP file marked with "a" at the end.

So I heard a John unit getting a tag check on this freq as well but then I heard a unit saying something along the lines of "hey rob... rob..." Like a guys name right before he said something to get his attention so I am wondering if this is a PD Training channel?

 

[maus92]

So I heard a John unit getting a tag check on this freq as well but then I heard a unit saying something along the lines of "hey rob... rob..." Like a guys name right before he said something to get his attention so I am wondering if this is a PD Training channel?

Or like Hey Rob - Rob! Wrong channel!

 

[Bjc123]

I dont know how to download this file from my Uniden Sentinel software but here is the transcription of what it said

"Rob.. Rob.. 7-George-22 Traffic? Go Ahead... Hold me out at 8750 Snouffer School Road at the racetrack. Maryland Registration ******.

If you look up the address it is the MoCo Public Training Facility and It has a racetrack so I am pretty sure that this is a PD Training Channel

We are making a lot of progress today!

 

[Bjc123]

Okay I figured it out here is the recording

6410_D - Google Drive

drive.google.com