Batboard

Can I interface an XTL1500 or XTL5000 800mz Smartnet II analog to a CDM750 VHF for crossband repeat. If so, can someone provide the pinout.

My VFD is migrating to the County trunk but will still be utilizing VHF handhelds for a couple of years. Need everyone to hear each other. Doable or not going to happen?

Thanks

John B

As you are public safety I would recommend against it. There are all sorts of issues hooking a trunked to a conventional and whilst some may say it's easy, its not that straight forward in public safety.

The best and by far most satisfactory result is achieved using a permanent patch on the CEB.
We use it to give our marine officers VHF channels 16 and channel 10 on their XTS5000 radios as well as a backup to the marine radios on boats.
I also used permanent patches whilst changing our fire and police over to fully digital operation.

Speak to the county comms guys and tell them what you want to do and they should be able to set you up

Excuse my ignorance, what is "CEB"? Do you mean the dispatch console?

I was just curious? We don't have in-house comm guys for the county, all contract $$$. They are working on hiring one however.

Also, we have 3 dispatch centers. The County being the main and 2 local PD's covering their areas (which is where we fall)

Any info you can share is appreciated.

CEB is Central Electronics Bank
It is generally for Motorola Consoles and is the back office type stuff that runs the dispatch consoles.
When you use a permanent patch the dispatcher would have one channel for your fire service and she would not know if you are trunked unit or not becuase it doesn't matter(Ok she would know the patch id eventually but thats irrelevent)
Do you fall under one PD or both

It also depends on the system config.
Ideally there will one CEB which makes sense for a county wide system (a state wide could have multiple)
So in the CEB a conventional BIM (Base Interface Module) is installed along with a phantom COIM (Console Interface Module) I'm sure the system will have spares of these and the COIM can be used for 14 different agencies in the same senario.
You will obviously have a trunked talkgroup assigned to the VFD for any new radios. This group is patched on the COIM to go to the BIM using what is called a permanent patch which the dispatchers cannot disable or unpatch.

So we now have your traffic coming out on the trunking as RF and the BIM as 4 wire Audio with tone keying.

The next part is where in relation to the CEB is your area. You would need to identify the nearest system tower, install your CDM there with the appropriate antenna and a TRC decoder and then ask for a 4 wire cct back to the CEB.

It probably sounds a lot of work but in reality its not that hard or expensive for a public safety unit depending on the relationship with the county.
I mean to program the COIM, BIM, program the 4 wire cct on a channel Bank, less than 2 hours work.
A TRC board is less than $100 and whatever is needed at the tower site with respect to Antenna etc which you probably already have.

Thanks, that is the information I wanted to know. Makes sense.

I really appreciate the feedback. Like I said, the County does not have a staff radio tech, so educating yourself if key.

No problem, As I said Ive done it before and we still patch our marine channels to a trunking talk group.

A major problem in linking any two radios together
is the possibility of loosing the first word or sylable
of what is being said. Unless there is some sort of
buffer to store the voice audio in before it is sent
out to the transmitters. This may or may not be taken
into account by the different console companies.

Another way of making the interop connection is by
using a gateway system. Here the radios are
connected to the interop gateway device with an
interface cable. All the delays are then taken care
of by the gateway. They also have the ability to set
the audio levels. Most gateway devices have the
ability to interconnect a number of radios, telephones, etc.

There are a number of companies that have the
gateway devices. The ones that are in the middle
of the road cost wise are JPS with the ACU-1000,
Infinimux and Sytech with their RIOS. In looking at
the simplest to use, my vote would go with Sytech Corp.
They have a great GUI interface. It is simple and of
the vendors mentioned, they are the lowest in cost.
Their unit can even interconnect multiple gateways
together and let you share resources between them.
All you need is an IP connection.

The National Guard is deploying the RIOS gateway
systems to a number of states this year. They will
have about over 25 systems in service before the
year is over. These systems allow the Guard to
interface with the local Public Safety agencies where
they may be deployed. Their systems contain 6
mobile radios. There are 2 each on VHF, UHF and
800 MHz contained in their system.

Jim

jban wrote:Can I interface an XTL1500 or XTL5000 800mz Smartnet II analog to a CDM750 VHF for crossband repeat. If so, can someone provide the pinout.

My VFD is migrating to the County trunk but will still be utilizing VHF handhelds for a couple of years. Need everyone to hear each other. Doable or not going to happen?

Thanks

John B

Thank you for the information.