Dobbs Ferry PD

[radioman2001]

I know that the system uses 5 channels per cell, I used the wrong term. Regardless the main issue is can you decode a single frequency in Pasae II

Quote"
I was never able to get past "finding control channel",

One thing I found is that Harris uses a 12k baud rate control channel. Don't know if scanners can decode that.

 

[rdxny]

One thing I found is that Harris uses a 12k baud rate control channel. Don't know if scanners can decode that.

The sds100 does fine decoding the control channel for this system.

 

[GTR8000]

I know that the system uses 5 channels per cell, I used the wrong term. Regardless the main issue is can you decode a single frequency in Pasae II

Why on earth would you want to decode a single TDMA frequency of a trunked system when the transmissions will be carried across all of the traffic channels on a rotating basis? Anyway, the answer is overwhelmingly no, you can't normally decode a P25 TDMA frequency as a standalone channel, unless you're using something like SDRTrunk which has that fairly unique feature. No real subscriber (including the Unication series pagers) or commercially available scanner will decode a P25 TDMA voice frequency as a "conventional" channel (i.e. standalone).

One thing I found is that Harris uses a 12k baud rate control channel. Don't know if scanners can decode that.

That's not correct. The control channel is the industry standard 9600 bps. You're likely confusing that with the TDMA traffic channels, which are 12000 bps, also the industry standard for H-DQPSK modulation.

Oh and as @rdxny stated, the Harris systems are nothing special, any modern P25 Phase II capable scanner can decode them (excluding a small handful of the TDMA control channel varieties that have started to pop up for utility providers).

 

[radioman2001]

Quote"
That's not correct. The control channel is the industry standard 9600 bps"

Interesting that WIKI says:

"P25 Phase I uses a 4800 baud, 9600bps control channel."
" P25 Phase II uses a 6000 baud, 12000bps control channel with AMBE2 vocoder at half-rate. "

Which is what I remember when talking to the vendor that built out the MRSS during some testing we were doing on our VHF system.

As far as 9600 control channels for Phase II I can lock onto Marylands Phase II, but not MRSS. Go figure?

 

[GTR8000]

Quote"
That's not correct. The control channel is the industry standard 9600 bps"

Interesting that WIKI says:

"P25 Phase I uses a 4800 baud, 9600bps control channel."
" P25 Phase II uses a 6000 baud, 12000bps control channel with AMBE2 vocoder at half-rate. "

Which is what I remember when talking to the vendor that built out the MRSS during some testing we were doing on our VHF system.

As far as 9600 control channels for Phase II I can lock onto Marylands Phase II, but not MRSS. Go figure?

The wiki is wrong. Phase I and Phase II both use the same FDMA control channel*...9600 bps/4800 baud. This is to ensure backwards compatibility between FDMA (Phase I) and TDMA (Phase II). TDMA voice channels are 12000 bps/6000 baud, not the control channel.

If you're having trouble with the MRRS (not MRSS), then you're probably experiencing simulcast distortion or some other factor. I've had no issues receiving that system with various Uniden scanners (SDS200, 536HP, 996P2)

* I have to once again point out the caveat that there are 2-3 new systems out there that are using actual TDMA (2-slot) control channels, which is different from the hundreds of currently deployed P25 systems that use an FDMA control channel for both Phase I and Phase II voice.

Now, how about we get back to the actual topic of the thread?

 

[seagravebuff60]

Hearing Dobbs Ferry PD on 460.475 DPL411 Dobbs Ferry PD 3. The only thing is it sounds digital, Even tho it is showing up as an analog DPL. Maybe a patch of some sort?

 

[thinktactics]

DFPD has at least one officer currently using the MRRS system. Unsure if they are testing or already moved over. Unable to ascertain TGID but there was definitely traffic between their units and their dispatch at approximately 1253 hours today.

 

[jman54]

Does anyone know if the Whistler scanners have any trouble with P25 phase II Simulcast for the MTA and Westchester PD?

 

[62Truck]

Does anyone know if the Whistler scanners have any trouble with P25 phase II Simulcast for the MTA and Westchester PD?

yes they do.

 

[seagravebuff60]

Does anyone know if the Whistler scanners have any trouble with P25 phase II Simulcast for the MTA and Westchester PD?

yes they do.

My 1040 does great on WCPD F1 VHF

 

[Bob1955]

The Dobbs Ferry PD changed their radios and now I can't hear anything on their existing frequency. Does anyone have any information on how to find them now?
Sam frequency, different transmission... new frequency?

They probably changed over to the Metro-25 MTA MMRS like Ardsley did not too long ago. Port Chester Police just switched last week.

 

[seagravebuff60]

They probably changed over to the Metro-25 MTA MMRS like Ardsley did not too long ago. Port Chester Police just switched last week.

M…..R…..R……S.

You are just full of knowledge today arent you?

 

[jman54]

My 1040 does great on WCPD F1 VHF

Can you receive the Metro-25/MTA MRRS Simulcast on your 1040?
I had a refurbished one and I liked it but then on the Digital channels for the Greenburgh and Tarrytown PD I started getting the data sound and the voice at the same time. I sent it in for repair and they cut me a refund check saying they couldn't fix it. I didn't try to config a P25 before I sent it back.

 

[seagravebuff60]

Can you receive the Metro-25/MTA MRRS Simulcast on your 1040?
I had a refurbished one and I liked it but then on the Digital channels for the Greenburgh and Tarrytown PD I started getting the data sound and the voice at the same time. I sent it in for repair and they cut me a refund check saying they couldn't fix it. I didn't try to config a P25 before I sent it back.

You quoted your post as mine lol.

No, It won't receive P25 Phase 2, haven't tried it on MRRS but A66 I have tried and it doesn't receive the system at all. I think WCPD is only Phase 1 so it receives it well but from time to time it is slow but I haven't had any significant problems with it. I'm not too familiar with Tarrytown PD but I thought GPD was Phase 1 still unless they changed recently?

Anyway, WCPD isn't 100% Perfect on the 1040, It has some issues randomly but nothing significant. But overall it receives well. I got mine pretty cheap from a friend that didn't need it anymore, I still hate the computer software used to program it but overall I do not have any complaints. I keep the squelch tight on it as well.

 

[jman54]

I called the Whistler Group and they said their TRX-1 and TRX-2 could get the Phase II MRRS MTA Simulcast if it is non-encrypted. I take it that the MTA MRRS is not encrypted? It's also interesting they are out of stock on most of their models.

 

[k2hz]

I called the Whistler Group and they said their TRX-1 and TRX-2 could get the Phase II MRRS MTA Simulcast if it is non-encrypted. I take it that the MTA MRRS is not encrypted? It's also interesting they are out of stock on most of their models.

Whistler may tell you their scanner "can get" simulcast but they are not designed to properly handle it so YMMV unless you happen to be fortunate to be in a good location. Odds are your reception will be poor. Whistler gave up on their plan for a scanner designed for simulcast to compete with the Uniden SDS scanners. See this thread:

Is Whistler Still in the Scanner Business ?

I haven't heard anything lately (in Years) from Whistler about any new scanners. Please excuse my ignorance... but are they still in the scanner business? Their former top-of-the-line scanner show "Sold Out" on their web site. I hate to see the competition disappear from the hobby. Thanks !

forums.radioreference.com

 

[seagravebuff60]

I take it that the MTA MRRS is not encrypted?

Correct the entire system it self is not encrypted as a whole, but certan talkgroups are, but unless it shows up as encrypted, by "E" in the mode collum in the database then its not. (or with any decoding software or scanner) Uppercase E for full Enceyption and lowercase e for partial encryption.

But if we are still talking about Dobbs Ferry PD, and if they still only use LTE (stupid), then unless the radio affilates to RF then you wont hear them.

 

[jman54]

You guys were correct. The Dobbs Ferry PD was given some loaner radios to try out the MTA MMRS system. They now have a proposal to purchase.....

 

[jman54]

So I take it that the transmission scheme and the encryption means we cannot receive these transmissions?

 

[jman54]

Radio reference updated the MTA / 25 for the Dobbs Ferry PD


So, before I give up on this, has anyone been able to pick them up and if so on what model scanner?