TN152 Linked Repeater Networks
MT-3/4 Radio Systems
TECHNICAL NOTES
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A linked repeater network is a series of repeaters that are linked together through RF links to create a wide area
conventional repeater network that allows for a widely confi gurable system with an expandable area of coverage
for mobile and portable radios (subscribers).
A linked repeater network can be installed as a fi xed network infrastructure, and can also be fully transportable. A
transportable linked repeater network is self-healing (linked repeaters can be added or removed at any time) and
is easily deployable and fi eld agile.
A linked repeater network is available as an analog only or analog and P25 digital (mixed mode) repeater network
giving the users full forwards and backwards compatibility with existing legacy equipment. In P25 Digital mode,
all encrypted voice and data will pass transparently through the repeater network. The repeaters do not require or
contain any encryption in order to pass the encryption through the repeater and links.
Repeaters and links can be any frequency band (VHF, UHF, 700/800/900 MHz). One common example is to have
VHF repeaters with UHF links.
Figure 1: Linked Repeater Network Diagram
A linked repeater network can be confi gured as two or more separate repeaters connected together. Figure 1
shows a system of three linked repeaters in use. Each repeater provides radio coverage for a local geographic
region utilizing a diff erent transmit / receive frequency pair. The repeater sites are RF linked together such that
transmitted information from Subscriber 1 is received at Site1, then linked to and rebroadcast from each repeater
in the system, allowing Subscriber 2 to receive the information from Site 3. This allows each subscriber to transmit
information to any other subscriber anywhere on the network.
The term Drop-Link is sometimes used to describe the repeater (drop) and the link in a linked repeater network.
HiveNet is also a term sometimes used to describe a linked repeater network.
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