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Digital patched analog question

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jacobsmith

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Joined
Jun 5, 2011
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65
Location
Chicago, Illinois, USA
So, I live in a county where the County Based EMS has digital radios, they are on the P25 digital state trunking system well, the original plan was for the analog repeaters/radios to be recycled and taken out of service. Well, the private ambulance companies couldn't "afford" to get new digital radios so the county donated all their old analog radios to the private ambulance companies.

So the UHF analog repeaters are still active and patched in to the new digital system well my question is... how do they patch the old analog raidos and new digital raidos together. The dispatcher TXs is in digital too ONLY the private EMS is analog.

Anyways...They act as one system... when the digital radio transmits the user of the analog radios can hear their transmission and vice-versa. From what I hear once they private ambulance companies have the money they will move to the digital radio system and then the analog radios will be taken out of service and recycled.

Sorry for the long question... I'm new here. :) Thanks!!
 

n5ims

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Jul 25, 2004
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3,863
Thinking of it this way should make this pretty easy for you. Once the radio is finished with its part, the audio is analog so you can easily patch analog to analog, digital to analog, digital to digital or pretty much any other combination you can think of (e.g. digital P-25 to digital MotoTRBO or even encrypted digital OpenSky to telephone audio feeding a conference call if that's what is required). What can be patched together is dependent on the capabilities of the radios used for the patching, not the radios used by the users (although obviously the patching radios will need to handle what the user's radios are capable of).

While some setups may allow a more direct patching method, they all can be pictured with this most simplistic design.

User's Radio <--> System Radio <--> Patching Device <--> System Radio <--> User's Radio
 
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fdcaptjd

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Joined
Aug 5, 2009
Messages
20
Location
NE OK
Hello.

As mentioned above, the "patch" uses the recovered voice. Meaning, what you would hear from the speaker were you sitting in from of the radio.

A simple way to patch a digital repeater to an analog would be to connect a digital mobile to an analog mobile. When the digital system goes active, the digital radio would hear it, hand its received audio to the analog radio, which would go into transmit and send the audio to the analog system. The process works the other direction, too.

A simple black box that is easily connected to radios and performs this function is something like the Trident I-OP interoperability box.

Not a sales pitch, as I am not connected with Trident in any way. Just a product that I am aware of.

Regards,

JD
 

RKG

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Joined
May 23, 2005
Messages
1,094
Location
Boston, MA
Or you can do it through a console with a press of a button (or click of a mouse). But the process is essentially the same. Console's detection of receiver qualification on Radio A causes it to key Radio B and pass the analog audio on Radio A's Rx line to Radio B's Tx line. If Radio A is digital, the digital audio has passed through the DIU and been converted to analog before the console channel card sees it, and if Radio B is digital, the console passes analog audio to the DIU where it is converted to digital and sent to Radio B.
 
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