January 2018 Club Meeting - Digital Voice Modes - the next step in repeater technology

Friday, January 19, 2018

7:00pm MST

Ascension Lutheran Church 1220 West Magee Road, Tucson, AZ


Handyman Corner

By Tom, W8TK

Kit of the month: Simple regenerative receiver

Project: Cable Management


Digital Voice Modes - The next step in repeater technology

Presented by Bob, AF9W

Digital Voice Modes

With the advent of digital voice in commecial radio it didn’t take long for those technologies to move into ham radio. With all the major Japanese and Chinese radio manufacturers selling digital voice products, this segment of ham radio is booming. Digital voice is easily transferred over the internet allowing even Technician licensees to have conversations with hams in other states and countries through their local repeater or hotspot. Software development around digital voice has lead to significant homebrewing to overcome some of the early limitations of digital voice. The presentation will discuss the growth of digital voice in ham radio, some history, the similarities and differences among the modes, and the current state of the art.

Bob, AF9W, has been licensed since 1979 and an OVARC member since April 2011. As a snowbird, he became interested in internet based digital voice as a means of keeping in touch with fellow hams as the sunspot cycle dipped into it a cyclical minimum. As a retired software engineer, he is also interested in ham radio software and mixing computers and radio.


December 2017 Club Meeting - "Holiday Party"

Sign Up for the Oro Valley Amateur Radio Club


2017 Holiday Party Potluck



December 10, 2017

3:00PM - 5:30PM

Ascension Lutheran Church

1220 West Magee Road, Tucson, AZ


Open to OVARC members only.

Members may bring a guest. 

Room for 96 so sign up early. 

Everyone will need to RSVP.  

In addition to a dish to pass, each member and guest(s) should bring at least one non-perishable food item for the church food drive. 

Click here to RSVP


Map of Ascension Lutheran Church

November 2017 Club Meeting - Visualizing VHF/UHF Propagation with Radio Mobile

Friday, November 17, 2017

7:00pm MST

Ascension Lutheran Church 1220 West Magee Road, Tucson, AZ


Handyman Corner

By Tom, W8TK

Kit of the month: Frog Sounds

Project: Build a 2 meter Yard Yagi for $4


Visualizing VHF/UHF Propagation with Radio Mobile

Presented by Bill, AB7AA


This presentation will focus primarily on interpretation of the VHF/UHF propagation coverage maps produced by the Radio Mobile computer program and how they can be used to estimate antenna gain, height, and power requirements for reliable FM service between mobile and fixed units.  OVARC repeater coverage maps have been uploaded to the clubs web site for user reference and repeater selection for required coverage.  The presentation will review the propagation methods used as well as their capabilities and limitations, however, the discussion will be limited primarily to concepts introduced on the Technician Class license exam.  As a minimum, this presentation should offer a visualization of VHF/UHF Propagation and why it differs from strictly optical line-of-sight.  Setup and execution of the program will not be covered, but for those interested in running the program, Bill offers a list of both text and video tutorials.

Bill was first licensed in 1965 and has held his present call (AB7AA) since upgrading to Amateur Extra in 1993. He spent his college years as a broadcast and studio recording engineer in commercial AM/FM/TV stations while receiving an undergraduate degree in Mathematics with Physics minor, and then did graduate studies in Systems Engineering. After college he spent a career flying various fighter aircraft while developing, evaluating, and teaching electronic warfare systems and tactics. He achieved the position of squadron commander in the Air National Guard A-7D Fighter Weapons School and helped initiate the F-16A Fighter Weapons School. After retiring, he had a second career as a commercial airline pilot.