Rowan university Public Safety

[Jelico]

I’m hearing the buzz saw and beeping on those old frequencies. Looked around YouTube and found the exact sound played on a VHF, -said it was the sound of DMR. I know that the EMS Pager will continue to be VHF. The Gloucester county and Camden county have the same thing, very busy on VHF. The Rowan EMS is not active-on duty when classes are not in session,but the security units are still on duty. Rowan PD has been encrypted for four years now.

So I’m not sure if I can just get an Motorola XPR to listen. Why would they sell me a transceiver? I was told that the Uniden SDS 100 and 200 support DMR but you have to buy the software. Thanks everyone for all of your input, this is very helpful.

 

[K2NEC]

So I’m not sure if I can just get an Motorola XPR to listen. Why would they sell me a transceiver? I was told that the Uniden SDS 100 and 200 support DMR but you have to buy the software. Thanks everyone for all of your input, this is very helpful.

Why an XPR? Just get a cheap chinese DMR radio. Same effect, 1/2 the cost.

 

[Jelico]

I can buy a DMR radio and program in the frequencies? That would certainly be a solution. I thought that some kind of key or permission would be needed. I mean, if you have a radio it’s a transceiver , you’d be able to transmit as well.

 

[K2NEC]

I can buy a DMR radio and program in the frequencies? That would certainly be a solution. I thought that some kind of key or permission would be needed. I mean, if you have a radio it’s a transceiver , you’d be able to transmit as well.

So don't transmit. There is a wonderful box called "Receive only" which does exactly what you think. Check that in the programming and you will never have a problem.

 

[Jelico]

I’m seeing a lot of cheeper DMR radios. Can some one tell me what RAS is? If it’s not RAS I can use a cheap DMR Radio. I spent over 30 years just having to know how to program radio shack scanners.

 

[NParkNJ]

I’m seeing a lot of cheeper DMR radios. Can some one tell me what RAS is? If it’s not RAS I can use a cheap DMR Radio. I spent over 30 years just having to know how to program radio shack scanners.

RAS.

Restricted Access to System.

There are 2 versions of RAS, and can be used to together, or by themselves.

The first, and I assume the most popular, is the “key” method. Basically every authorized radio and the repeater have the key programmed in. Without the key, no radio transmits, or hears. Period. Locked out.

The next, and I assume less popular for obvious reasons, is radio ID range.

So for example, if a Police Department was using ids 100-110 for example, a radio would only work with that range of ids.

However, being radio ids are easily read/programmed, the first method is what I have noticed to be used in practice.

RAS is not encryption. It CAN be used with encryption, but is not. An authorized radio, scanners(with DMR update/download), and DSD can all receive RAS enabled transmissions.

For example, up by me, Pequannock PD, and Bloomingdale PD are on DMR Conventional with RAS. My scanner does a good job of decoding them.

Besides programming it in a radio and listening, unless someone else is in the know with those DMR frequencies, its try it and see what happens.

Nick

 

[K2NEC]

RAS.

Restricted Access to System.

There are 2 versions of RAS, and can be used to together, or by themselves.

The first, and I assume the most popular, is the “key” method. Basically every authorized radio and the repeater have the key programmed in. Without the key, no radio transmits, or hears. Period. Locked out.

The next, and I assume less popular for obvious reasons, is radio ID range.

So for example, if a Police Department was using ids 100-110 for example, a radio would only work with that range of ids.

However, being radio ids are easily read/programmed, the first method is what I have noticed to be used in practice.

RAS is not encryption. It CAN be used with encryption, but is not. An authorized radio, scanners(with DMR update/download), and DSD can all receive RAS enabled transmissions.

For example, up by me, Pequannock PD, and Bloomingdale PD are on DMR Conventional with RAS. My scanner does a good job of decoding them.

Besides programming it in a radio and listening, unless someone else is in the know with those DMR frequencies, its try it and see what happens.

Nick

Let me clarify some things here.

This only applies to Motorola radios. There is no such thing as RAS for Hytera or TYT or even Kenwood. It's strictly Motorola proprietary. That being said, those mentioned radios will not be able to work on the system whether that is to transmit or to receive. I have heard of Anytone radios being able to bypass this but I cannot personally confirm that it works.

Without the key (or the proper key for that matter) a Motorola radio will not receive any transmissions and you won't see any ID's. The radio throws away the transmission because the key is not confirmed. If you try to transmit, the repeater doesn't match the key and again, transmission is thrown away.

If you buy a $80 chinese DMR radio and have all the proper information in and still aren't hearing any transmissions, it's likely RAS.

 

[Jelico]

Well it’s worth a try with cheap radio. Otherwise I’ll get a Unidin and pay for the DMR key. I doubt they encrypted the security frequencies., though, if they did, that would be a big disappointment. Anyway, with the Uniden I might be able to hear fire and ems. I have read that in some cities, however, they encrypted every thing on p25 phase 2. I don’t know if that’s the case in Gloucester County NJ. Would love to hear the fire department again. Glassboro fire used to display their radio frequency right on their home web page. Thanks!

 

[FireHam32]

Only law enforcement is encrypted on the GCPS system. Fire/EMS and county services (highway dept., animal control, etc.) are in the clear and can be monitored with a P25 Ph2 capable scanner. Gloucester County does run a simulcast system though, so your mileage may vary with reception depending on what scanner you use, what your antenna situation is, and where exactly you are while trying to listen. My personal experience is with a BCD436HP, which I can confirm has problems with simulcast distortion on the GCPS system when you start getting in between towers.

 

[Jelico]

I used to listen to use four scanners at once so that I could hear everything. The VHF radio shacks were only 100 bucks a piece. Thanks for the info!

 

[Jelico]

Yes, they are using DMR on the same old VHF frequencies. 155.835 is the repeater output and 158.925 is the repeater input for their main channel, so you only need to listen on 155.835. They are mostly using XPRs with a few CP/CM series radios in the mix as well.

 

[Jelico]

I‘m sure I’ll be getting an sds200 for a solution to picking up the Rowan security, since I’ll be able to get other use out of it. I have plenty of time to figure this out. If I have the frequencies, which I do, will a need a color code or any other information? l’m seeing a lot of questions and answers regarding dmr and it still doesn’t sound simple.

 

[CM1]

This might help you figure out what's around you too, and scanner options etc...

Digital Frequency Search

Find the newest frequencies for your digital radio scanner.

digitalfrequencysearch.com

 

[Jelico]

Thanks! Great info and interesting

 

[Jelico]

Hi,

I got my sds200. Working well. I have county 25 and state police. I’m hearing the county fire ems units, which are on p25. I have my Rowan frequency, 155.8350 set for DMr but I’m not getting anything when I hear the buss saw sound on my old fmn scanner . Do I need the specific slot and color code entered here? The database is not updated yet so I don’t have that information. I’m seeing, on the screen, slot code 1, color code 7. Any help would be appreciated.

 

[tvengr]

Database shows that Rowan College campus operations is on talkgroup 3118 of the new Burlington County Public Safety P25 system.

 

[Jelico]

Database shows that Rowan College campus operations is on talkgroup 3118 of the new Burlington County Public Safety P25 system.

I’ll check that out. Rowan U is in Gloucester county but they do have some Rowan satellite campuses. I’m not giving up on this.

 

[FireHam32]

Check out the new update to the database for Rowan on the Gloucester County page from earlier today. The talkgroup for the security main channel is 9001. The call boxes (TG 9002) and EMS Ops (TG 9003) channels also went digital on their respective frequencies. Still need to verify the slots and color codes on those channels.

 

[tvengr]

Don't see a talkgroup on this:

Frequency	License	Type	Tone	Alpha Tag	Description	Mode	Tag
155.83500	KNNU362	RM	CC 3 TG * SL 1	RU PubSafety	Public-Safety Operations	DMR	Law Dispatc

 

[Jelico]

Check out the new update to the database for Rowan on the Gloucester County page from earlier today. The talkgroup for the security main channel is 9001. The call boxes (TG 9002) and EMS Ops (TG 9003) channels also went digital on their respective frequencies. Still need to verify the slots and color codes on those channels.

Thanks I’ll take a look at it now.