400 - 800

[ILMRadioMan]

So for sake, are the TGs patched together exactly?

I.E. if I was listening on a specific talkgroup normally used on 400, but was listening on the 800 system, would I hear the same audio?

From reading the stickies it seemed like that, but I just wanted to verify.

BTW if anyone doesnt assume it, I am talking about the DC system.

 

[ILMRadioMan]

Bump for the morning.

 

[ILMRadioMan]

????? bump again.

 

[ScanManQSL]

So for sake, are the TGs patched together exactly?

I.E. if I was listening on a specific talkgroup normally used on 400, but was listening on the 800 system, would I hear the same audio?

From reading the stickies it seemed like that, but I just wanted to verify.

BTW if anyone doesnt assume it, I am talking about the DC system.

I am sure someone can explain this a little better...

The 460Mhz UHF and the 850Mhz are separate trunking systems. Both trunking systems operate on a Motorola Type II Smartzone system with an analog / APCO25 Common Air Interface (how the voice gets coded digitally). DC Fire & EMS and other agencies are on the city’s 800 MHz system while the DC Metropolitan Police operates on the 460MHz system. Sometimes the DC Metropolitan Police talk groups may show up on the 850Mhz system and other agencies may show up on 460mhz system. Back to your question "are the TGs patched together exactly?". I don't know if the talkgroups can be patch between the two systems. In a way, they are linked together.

 

[ILMRadioMan]

They are same System ID, but two completely seperate systems?

Wouldnt be the first time I have seen that, but seems unusual.

But that being said, if there is no patch now, that means that I cant program the hex for the PD Dispatch on the 800 MHz system and hear PD dispatch talking.

 

[ScanManQSL]

They are same System ID, but two completely seperate systems?

They are separate but linked. I am not an expert on this topic but I have found some more information.

MPDC now simulcasting on the 800 system
http://www.radioreference.com/forums/washington-dc-radio-discussion-forum/125247-mpdc-now-simulcasting-800-system.html

But that being said, if there is no patch now, that means that I cant program the hex for the PD Dispatch on the 800 MHz system and hear PD dispatch talking.

In order for you to monitor all activity, you will need to program both the 460Mhz and the 800Mhz trunking systems as SEPARATE SYSTEMS in your scanner. You should program the DC Metropolitan Police talkgroups on the 460Mhz system and the DC Fire & EMS on the 800Mhz system.

 

[ka3jjz]

If you aren't using the PSR500/600 scanners (which can accept hex programming), you're better off sticking with the decimal representations of the talkgroups. Apart from the GRE digitals, the only other users of the hex programming are likely to be Moto radios AFAIK 73 Mike

 

[ILMRadioMan]

I am trying to program it into a radio, not a scanner. I apologize, as I should have made that clear from the go.

I have an 800 MHz radio that is capable of listening on this system, but if I cant hear PD on it, its useless to program those TGs into my radio.

 

[ILMRadioMan]

Ok after reading that link, it is what I thought.

Some of the more hairbrained Moto brothers out there are using multi-frequency systems.

So both systems have one controller.

Basically they all see the same stuff, and they all probably share the same ID database.

So therefore it seems someone from the 800 side could page/private call someone on the UHF side.

It makes sense, but I wanted to make sure.

That also being said, means that an 800 radio could listen in to the UHF side PD talkgroups if 1) It has an authorized ID, 2) someone with an authorized ID was already affiliated to the system.

 

[ScanManQSL]

I am trying to program it into a radio, not a scanner. I apologize, as I should have made that clear from the go.

I have an 800 MHz radio that is capable of listening on this system, but if I cant hear PD on it, its useless to program those TGs into my radio.

From my understanding you are trying to program the DC's trunking systems into your personal public safety radio??? What is the make/model of your radio? What are you going to use this radio for?

 

[ILMRadioMan]

Ah I see you changed your post

XTS2500

And to answer your original question, the same thing you and anyone else on this site is doing.

 

[gesucks]

Ah I see you changed your post

XTS2500

And to answer your original question, the same thing you and anyone else on this site is doing.

IF you want to program it in your radio it can be done, go see you department radio shop and if they give you authorization to have it in your radio they will but it in. If not BUY A SCANNER.

 

[ILMRadioMan]

I am the radio shop.

I plan on programming it in, and I only plan on listening just like anyone else here is.

 

[ScanManQSL]

I am the radio shop... ...I plan on programming it in

You will have to go to the departments radio shop to receive authorization. Your radio will not work unless you have the system security key. Only a small handful of people know the security key and that's the department's radio shop. If you do decide to program the radio yourself WITHOUT authorization. They will see the serial number of your radio and potentially get banned from the trunking system. Failure to do so could be considered an unauthorized radio operation by the FCC.

Other than that.... Give the radio shop a call and see what they have to say.

 

[gesucks]

I am the radio shop.

I plan on programming it in, and I only plan on listening just like anyone else here is.

Last time I checked, the DC Office of Unifed Commincations, MPDC and DCFEMS, did not give authority to any radio shop or agency in North Carolina to program their system in to ANY radios.

The difference between you and "anyone else" is that we either use scanners or have legit ID's on the system and not a unauthorized radio illegally accessing the system.

AND YOU SHOULD KNOW BETTER... if you dont just reread you old post...

"ILMRadioMan
Member Join Date: Feb 2009
Location: Wilmington, NC
Posts: 201



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Ditto, as a tech at a motorola shop, I cant begin to tell you the number of times that I have had someone come in and ask us to program their radio.

Many times they are legitimate VFD employees, but our speicific instructions from the owners/managers of the system we help with, is that nothing gets on that system without their specific knowledge and approval.

I am sure that the system owners there are no different.

I would say best case scenario, is to get some documentation signed by your chief or the system manager, the go to your local motorola shop and have them program it."

 

[ILMRadioMan]

deleted

 

[immelmen]

...to answer the technical portion of the OP, the DC system in a single Moto SZ system with both UHF and 800 freqs split into two simulcast sites. (there is a similar system in Central VA run by DOD that covers Ft. Lee/Norfolk area.)

IF there is a legit 800 radio affiliated to a MPDC talk group, and a cop PTT's then he will get TWO channel grants, one on an 800 freq and one on a UHF freq....both 800 users and 400 users on the talkgroup will hear it.

In this SZ system the sites simply cover different bands rather then geographic areas.