Orange County CORNet P25 System

[KC2GSP]

I'm on the Putnam-Westchester line and listen to the Orange P25 system around the house with a Unication pager. When I throw it the amplified charger (with external antenna) it's full scale everywhere in the house

 

[k2hz]

It appears that most on this thread have trunking P-25 Phase 2 capable scanners.
I've had some success listening to the system's South signal with just a single RTL-SDR, a piece of wire hanging from the window, and SDR-Trunk software running on Windows.
Next step for me is either a second RTL-SDR (or other SDR) with DSD+, or a discriminator tap on an old scanner and DSD+.
The threads on this system have been most helpful. I'm keeping an eye out for the day when the LE talkgroups become encrypted.

In my experience, DSD+ on a discriminator tap is ineffective for simulcast systems since it has the same issues as typical scanners in attempting to demodulate a complex digital signal from an analog device discriminator output. I use DSD+ from a IC-R7000 discriminator tap for control channel signal analysis but audio demodulation is generally poor to useless in the presence of simulcast distortion. You need the IQ demodulation capabilities of a SDR or digital device to properly process simulcast signals.

 

[GTR8000]

DSD+ will not track P25 Phase II systems unless you are using FMPx with TCP linking.

Also, SDRTrunk has superior audio quality compared to DSD+. In addition, SDRTrunk can pull in all frequencies of the South cell using a single dongle and can decode every voice transmission simultaneously, something that DSD+ cannot do. To switch from SDRTrunk to DSD+ would be a downgrade in all regards.

 

[GTR8000]

I'm keeping an eye out for the day when the LE talkgroups become encrypted.

Regarding my post from Jun 3, 2020, that plan was killed in the womb and obviously never materialized. Allegedly there has been discussion of encrypting the LE Tac talkgroups at some point in the future, but that hasn't come to fruition yet either, so just enjoy listening and let's leave it at that.

 

[Com-Tech51H8]

Does anyone have the band plan for this that they are willing to share?

 

[IFRIED91]

Does anyone have the band plan for this that they are willing to share?

Use the standard 7/800mhz IDEN

 

[IFRIED91]

Works for me perfectly

 

[w2lpa]

My SDRTrunk + short antenna setup works fine. I entered the talkgroups semi-manually, which was a good exercise in learning the software's Playlist Editor.
I have a couple of questions on the system's antenna towers:
1) There are towers at both the 911 Emergency center in Goshen, and the Fire Training center in New Hampton.
Is the tower at New Hampton needed to get line of sight to Mt. Peter? Curious as to why there are 2 towers relatively close together like this.
2) I see the history of the Arden tower that is shown on the system's tower map,it didn't happen because Arden House changed ownership. Is there an alternative for Arden currently being worked on?

 

[APX8000]

1). The backup for the 911 Center is at the FTC in New Hampton, hence the tower. The tower there is not part of the North Simulcast.
2). Yes, but not in that area...I can't really elaborate other that the equipment will be deployed elsewhere in the near future vs sitting collecting dust. For that area though, no. Bull Hill is a great alternative (where West Point has a site for their TRS) but the site is not really a viable option and Woodbury hasn't really complained enough.

 

[GTR8000]

1. Goshen is an RF subsite of the north cell, in addition to being the location of the core and prime site for the north cell. There is no RF at the FTC, however the prime site for the south cell is located there. The tower is for microwave, with hops to Goshen and to Mt. Peter.

2. No replacement for Arden.

 

[w2lpa]

Which of the antenna towers at the OC Jail/911 Emergency Center on Wells Farm Road is for CORNET? Is it the tower at the emergency center, or the other tower past the jail?

 

[APX8000]

911 Center.

 

[w2lpa]

Is it a hardline connection from the 911 center to Fire Training Center? I only see one microwave antenna.

 

[GTR8000]

Is it a hardline connection from the 911 center to Fire Training Center? I only see one microwave antenna.

No, it's an 11 GHz microwave hop.