New Pike County Radio System

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New Pike County Radio System

• Griggsville Fire Dept.
• and
• B-K Electric, Inc.

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Simplex Radio
Everyone hears everyone else directly most of
the time.
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News Flash!Welcome to Pike County.
Houston, we have a problem
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Simple Repeater SystemSingle site with one
combined receiver transmitter
Better than simplex, but there are holes and dead
spots. And, to the repeater Dispatch is just
another mobile a big red brick one.
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Complex Repeater SystemMultiple Repeaters
Far too difficult. Mobiles have to manually
select the right repeater channel. Dispatch ends
up verbally relaying information.
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The new system makes it automatic.

• Important Concept
• Receive Transmit
• are now two separate operations and may use
  different sites!

Note The following slides show only one example
site in use. In reality the automatic system and
Dispatch will use all sites for both receive and
transmit.
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A mobile transmits
Audio from the mobile is received at several
locations, some better than others, but were
not ready to transmit quite yet
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Voter ReceivingSignal processing

• A mobile transmits. Many system receivers hear it
  and they all send the mobile audio to the central
  processor called the Voter.
• The Voter decides which receiver is getting the
  best quality audio from the mobile.
• The Voter then sends the clearest mobile audio to
  Dispatch AND the best transmitter for the area.
• Unless Dispatch forces a specific transmitter
  for all traffic. Maps follow.

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The voter decides

• Ive got nothing up north
• a scratchy in the middle
• ... a so-so down south
• and a real good over west.
• A decision is automatically made on which one
  sounds best.
• Delay? Less than 0.25 seconds!

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Voter Transmitting

• The Voter sends the best audio to the
  Dispatchers console,
• -AND-
• the Voter sends the same audio to a transmitter
  so other mobiles can hear.
• The voting process is undetectable!

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Best mobile audio is sent to both a transmitter
and Dispatch.

• Everyone hears the voted audio.

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Next Dispatch Calling a Mobile
1701, Pike County.
Dispatch chooses any one site to call from.
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The Mobile Answers

• Pike County, 1701. Go Ahead

The Voter selects a transmitter and everybody
hears the voted audio from 1701.
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Dispatch and Mobile TalkAll transmit is
automatically steered to the mobile.

• Blah, Blah Blah-Blah, Blah

Everybody hears the whole conversation.
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Optional Transmitter ForcingDispatch locks
transmission to ONE site

• All receivers are still active.
• The Voter decides which receiver has the best
  audio, but only the forced transmitter sends a
  signal.

Pike, 1701 Fully involved structure. Send us
another water tanker.1701, Pike County
Acknowledged.1701 from Griggsville Tanker
Were already at the firehouse!
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MAPSTransmitter and Receiver Locations
El Dara Water Tower Hull Water Tower Griggsville
Water Tower Pea Ridge Water Tower
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MAPSDefault Transmitter Selection

• El Dara
• Hull
• Griggsville
• Pea Ridge

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MAPSProjected Mobile Coverage
El Dara
Hull
GVille
Pea Ridge