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Radio Communications PowerPoint PPT Presentation

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BLM. COLORADO. Radio Communications. Basic Course. Course Objectives. Radio Theory Terrain Effects Antenna Design Narrowband. Course Objectives. Infrastructure Common Phrases Procedures for Repair Emergencies Familiarization. BE SAFE!. Prepare For Your Trip.

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Radio Communications

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Radio Communications

Basic Course

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Course Objectives

  • Radio Theory

  • Terrain Effects

  • Antenna Design

  • Narrowband

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Course Objectives

  • Infrastructure

  • Common Phrases

  • Procedures for Repair

  • Emergencies

  • Familiarization

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Prepare For Your Trip

  • Follow Office Specific Check In/Out Procedures.

  • Visually inspect and check your equipment for proper operation before leaving for the field.

  • Do a radio check.

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Know Your Options

  • Know what sites cover your intended work/travel.

  • What is their operational status?

  • Alternative forms of communications.

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Radio Theory

  • Radio waves are generated by a rapidly oscillating electric current.

  • Frequency is the amount of cycles a radio wave makes referenced to one second of time.

  • Wave length is the distance the wave travels to complete one cycle.

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Example: One Wave Traveling at One Cycle Per Second

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Radio and Light Waves

  • Radio Waves are Electromagnetic Energy.

  • Light Waves are Electromagnetic Energy.

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Similar Properties

  • Radio waves travel in much the same way as light.

  • Imagine a light bulb on top of your handheld or vehicle.

  • The energy is similarly

    sent in all directions.

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More Similarities

  • Reflected

  • Absorbed

  • Diffracted

  • Dispersed

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Handhelds and Mobiles Perform Differently

  • Handhelds Transmit with less power utilizing a small battery source.

  • Mobiles utilize a gain antenna which effectively doubles the transmit power and receive sensitivity.

  • Handheld antennas tend to be more obstructed.

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Batteries are Critical

  • Proper care of batteries is essential.

  • Batteries are a users responsibility.

  • Typically last for 8 hours before charging.

  • Radio will not transmit effectively.

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Antenna Comparison

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Things to Remember

  • Height is more advantageous than power.

  • Know the location of the site you are trying to transmit to and what objects or terrain are in the path.

  • A small shift in position can make a big difference in signal quality.

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Height Matters

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How Far Can You Communicate

  • Typically BLM handhelds can communicate within a few miles of each other.

  • Typically a BLM vehicle radio to a BLM mountaintop radio can communicate about 40 miles apart.

  • Typically BLM mountaintop radios can communicate about 100 miles apart.

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  • Narrowband radios are mandated for BLM use.

  • Radios programmed incorrectly will sound distorted.

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Base Station

  • A means for dispatch to communicate to users over a large area in the field.

  • Radio is installed for optimum performance.

  • Users may not hear both sides of conversation.

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Base Station

  • Radio is connected to dispatch center and remotely controlled.

  • Radio can be used to access repeaters.

  • Radio does not have a squelch tail.

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Base Station

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  • They extend the coverage area.

  • Received signals are repeated.

  • Radio is installed for optimum performance.

  • Users hear both sides of conversation.

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  • Operates on two frequencies.

  • Squelch tail is present.

  • Radio has no physical connection to dispatch.

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  • Open a ticket in Remedy

  • Document your radio problem symptoms and what you have done to determine problem.

  • System outage contact Dispatch Office

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User Responsibility

  • Never change your antenna

  • Insure you have an antenna

  • Battery

  • Keeping radio clean

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Is Anyone Out There

  • Your radio must be transmitting on the same frequency the radio you are trying to reach is receiving.

  • Your radio must be transmitting the same sub audible tone the radio you are trying to reach is listening for.

  • We don’t typically use receive sub audible tones on our portables and mobiles.

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  • R-elax

  • A-djust Volume, Channel

  • D-etermine - What your going to say. Is it your time to talk?

  • I-nitiate Contact

  • O-ver

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Proper Use

  • Hold the radio about an inch away

  • Push the PTT button and wait one second before talking.

  • Talk directly into the microphone

  • Identify who your calling and then yourself

  • Wait for their response then proceed.

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Use Concise Common Terms

  • Affirmative

  • Negative

  • Disregard

  • Clear or Out

  • Standby

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  • Try to contact any Interagency Dispatch Center.

  • Try to contact any person listening to radio.

  • Use National Law Enforcement Emergency Channel, (NLEEC) to contact a law enforcement dispatcher.

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Banks, Zones, Channels

  • Banks contain zones or groups

  • Zones and Groups contain individual channels

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We will now go over the radios by specific manufacturer for the types your group is using (BK, EF Johnson, Thales, etc).

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This concludes the Radio Communications Basic Course



For Questions, Comments, Ideas or Errors please contact your local Telecommunications Specialist.

Spring 2008

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