Interconnect VHF and UHF radios sourced from different manufacturers or with different electrical interfaces.

Each device in the 619 Range has ports that support four-wire audio with E & M signalling. The audio ports are balanced with 600-Ohm transformer coupling. Besides providing isolation between devices and virtually eliminating ground noise, the audio ports allow connection to both balanced and unbalanced equipment. The E & M pins can be configured to work with any COS and PTT combination of the radio equipment. They provide isolation and can be configured for relay control or opto (voltage) input/output. Links also allow both inputs and outputs to be configured to source or sink power.

Note. In some cases, the interface pins of the radio may need to be re-configured to provide a COS output function.

 

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Implement cross-band repeaters to interconnect HF, VHF and UHF radios

Cross-band repeating is a common and cost-effective method of providing interoperability. It is the primary role of any 619 Audio Bridge.

To further enhance this interoperability function, the 619SRI supports a VOX facility that allows the device to interface with equipment, such as HF radios that do not provide a COS/COR output.

 

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Build a link-repeater site with multiple radios

Link-Repeater sites can be constructed using either the 619EI or 619SRI. Virtually any type of radio can be used, regardless of manufacturer or band. Link paths can be setup and modified on site.

 

The 619SRI offer additional benefits in terms of its signalling capability. For example, the device has the ability to detect CTCSS tones directly and re-generate its own tones.

 

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Dynamically re-configure radio networks on demand

The 619SRI allows network operators to switch between preset configurations by sending a DTMF or SELCAL sequence. A common requirement is the need to switch between just two alternate configurations. The 619SRI provides a natural support for this function through the ‘System Split’ feature, using the ‘Primary’ and ‘Secondary’ configurations only.

In this example, Ports 1 and 5 are connected to the link and are configured to receive and transmit audio through Port-3 (the repeater port) using the ‘Primary’ configuration. However, the ‘Secondary’ configuration can be setup to ‘unlink’ Port-3 from the other two ports. This is commonly used by emergency groups during peak activity periods.

When required, the ‘Secondary’ configuration can be installed by sending either a DTMF tone sequence or a SELCAL code. Once installed, the ‘Secondary’ configuration ensures that link traffic passes through the 619SRI without interference from the traffic on the repeater port.

To reconnect the repeater, two methods are available. Firstly, a DTMF or SELCAL sequence can be sent to re-install the ‘Primary’ configuration. Or alternatively, a timer can be setup to cause the system to automatically revert back to the ‘Primary’ configuration after a number of minutes.

Is also possible to switch any of the optional configurations, using DTMF or SELCAL.

 

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Connect in-band keyed links to CTCSS-based radios

The 619SRI can provide an interface between private or leased lines and multiple groups of mobile users. Typically, each mobile group must be serviced by different repeaters and with different CTCSS frequencies and the lines use in-band keying.

The 619SRI can be programmed to accept audio that is qualified with a specific in-band keying tone, such as 2600Hz, or a CTCSS frequency. The audio can be routed to desired ports and, on transmission, a specified CTCSS tone can be mixed in with the out-going audio.

In this example, a large courier company has three groups of mobile users communicating through three repeater networks. Each network uses a different CTCSS frequency to prevent unwanted interruptions. A dispatch operator at the base can talk and monitor each group of users. This is done through a private 2-wire line that uses a 2600Hz keying tone.

The 619SRI will automatically perform tone to CTCSS conversion to enable the dispatcher to talk to the mobile fleet. Conversely, the device also performs CTCSS to tone conversion, so that when mobiles talk, the dispatcher can listen to their conversations. When more than one network is active, the 619SRI will mix the received signals for the operator, regardless of the incoming CTCSS tones.

Since the keying tone and CTCSS frequencies are all programmable within the 619SRI, this results in an efficient radio system with minimal cost expenditure.

 

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Convert 4-wire + in-band tone to 4-wire E&M

The 900DEN module is a device that has been designed to convert 4-wire + E&M (ie. 619 Audio Bridge port) to a 4-wire (full-duplex) line. In addition, the 900DEN implements in-band signalling for both mute and PTT.

Functionally, the unit operates as shown below:

 

 

 

 

 

 

 

 

 

The example below shows how a 900DEN can interface a full-duplex audio bearer to a 619EI Audio Bridge. The bearer uses 2600Hz keying tone in both directions.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Connect a 2-wire device to a 4-wire device

The 936MPI is an extremely useful interface that can be used in a variety of applications. However, one of its most common applications is to easily convert between unbalanced 2-wire audio and balanced 4-wire audio. An example occurs when you need to connect two radios back to back.

 

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Remote Radio Access using the IPR100 Voice over IP Adaptor

An operator can control and monitor a remote transceiver across a Local Area Network or a Wide Area Network. The transmit and receive audio, along with the PTT and Busy/COS signals, are transported over the link transparently, using VoIP Multicasting techniques. SELCAL and DTMF are also transported reliably, regardless of the level of compression that is employed.

Multiple Omnitronics handsets and consoles can be multi-dropped to allow shared access to the transceiver by a number of operators.

 

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UHF/VHF Link Replacement using the IPR100 Voice over IP Adaptor

Two radios can be connected back-to-back over an IP link. This can typically be used to interconnect two repeater sites over a Wide Area Network. PTT and COS signals are transported over the link as data messages. The IPR100 will provide a configurable PTT output to the radio. It will also accept a configurable COS input from the radio. An active COS signal from the radio will enable the transmission of voice packets over the IP network and generate a PTT output at the opposite end. Full duplex operation is supported.

 

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Leased Line Replacement using the IPR100 Voice over IP Adaptor

Two audio devices, such as 4-wire audio bearers, can be connected back-to-back over an IP link. Since the communications equipment will not provide a COS output, a VOX function is implemented in the IPR100 using the VAD (Voice Activity Detector) feature. When a voice signal is detected at the radio port of the IPR100, an internal COS signal is generated and transmitted to the destination IPR100. This will also enable the transmission of voice packets over the IP network. A hang period is automatically applied to the VOX algorithm. Full duplex operation is supported.

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