let’s use our repeater estes valley amateur radio club 2014 composed by: doug n6ua arranged by:...
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Let’s Use Our Repeater
Estes Valley Amateur Radio Club2014
Composed by: Doug N6UA
Arranged by: Dave KBØWVH
Composed by: Doug N6UA
Arranged by: Dave KBØWVH
3-16-20143-16-2014
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•What’s in it for me?
•Do more with:
•Your license
•Club assets
•That expensive radio you bought
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•How?
•FM means a clear(er) signal
•Unlike HF with
•Pink Noise
•QRM - “M”an-Made Noise
•Static (QRN) - “N”ature-Made Noise
Enjoy our EVARC RepeaterEnjoy our EVARC Repeater
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•How?
•Extends range of your radio
•Line of Sight
•Low Power
•VoIP (Voice over IP) technology
•Really extends range for all licensees
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Estes is town “A”
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•Basics of Communication - Legal
•FCC Part 97.119 (ID)
•Simple - Who are you?
•This is W7ABC - done!
•Beginning/End of conversation
•Every 10 minutes once contact is established.
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•Basics of Communication - Technical
•FM - one channel - and a band plan
•You ‘can’ be heard
•SSB/CW - infinite frequencies - band plan
•You ‘might’ be heard
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•Basics of Communication - Technical
•FM and channels?
•Simplex - e.g. 146.55 (transmit/receive)
•Repeater – e.g, repeater N0FH
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•What is a Repeater?
•A separate receiver and a separate transmitter in the same box
Kenwood TKR-750 a VHF repeater
Receiver146.085 MHz
Transmitter146.685 MHz
NØFHNØFH
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A Box – Not Real Exciting
Kenwood TKR-750 Repeater
(Rack mounted)
(Rack mounted)
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•Zapping receiver with transmitted signal is not good – “Old Smokey” - a solution?
•Duplexor - resonant “cavity”, a filter!!
•Works by ‘nulling’ transmitted power on receive side of cavity
•Aha! Why we have 600 KHz between receive and transmit frequencies!
An Issue!An Issue!
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•Duplexer - resonant cavity (a filter!)
•Tuned for our very specific frequencies
•3 connections - Receiver, Transmitter and Antenna
To Receiver
From Transmitt
erCommo
nAntenn
a
Duplexer
The Solution!The Solution!
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•Namely, a repeater “Controller”
•Ours is an S-Com 7330
Another Box Makes Things Even Better
Another Box Makes Things Even Better
(Rack mounted)
(Rack mounted)
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•A Controller permits other functions:
•Multiple repeaters - VHF and UHF
•Other functions - VoIP technology?
More, Another Box Makes it Even Better
More, Another Box Makes it Even Better
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•Our Controller manages:
•VHF repeater
•UHF repeater
•Computer for IRLP (Internet Repeater Linking
Project) and Echolink (using VoIP technology)
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N0FH Block Diagram
For the I.T. folks!For the I.T. folks!
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•VoIP technology? Now you lost me ...
•Voice over IP (Internet phones) - MagicJack, Vonage, Ooma and more
•“The Computer” rescues us
•Sound card - digitizes “audio” which can be sent/received over Internet
•Controls a ‘session’
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•But you said IRLP and Echolink
•Similarities - They use the same VoIP technology, same computer to extend range of communications to World-Wide
•Differences?
•IRLP links repeaters (Internet Repeater Linking Project)
•Echolink links HAM ‘devices’
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•What are HAM ‘devices’ ?
•Your radio - HT, mobile, base
•Club repeaters
•computers - desktop/laptop/netbooks and tablets
•smartphones (yeah, they’re really a computer under the covers)
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•What about CTCSS/PL?
•Continuous Tone Coded Squelch System
•Sub-audible tone (Private Line) - same thing
•Works for transmit and receive (repeater users use it on transmit only so our repeater knows it is “us” and not a Woodland Park user)
One Last Item!One Last Item!
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EVARC
•Thanks again
•Let’s do some HT programming . . .
•AND, some repeater practice QSOs, and enjoy our repeater!
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One of my favorite wanabee Hams!
One of my favorite wanabee Hams!