OVARC Monthly Club Meetings

The Oro Valley Amateur Radio Club monthly meetings are open to anyone interested in amateur radio.  You do not have to be a licensed ham or a member of OVARC to attend OVARC meetings.  

Meetings are held on the third Friday of every month unless changed by the OVARC board.   The June meeting is normally Field Day and the December meeting varies as it is our annual Christmas Party and may vary due to venue.  Meetings normally start at 7:00pm but you are welcome to arrive earlier to help set up and/or chat with other members.  Check the latest meeting notice for details on our next meeting.  

Meetings are currently held at 

Ascension Lutheran Church 
and School
1220 W Magee Rd
Tucson, AZ 85704

February 2018 Club Meeting - HAMSCI and the 2017 Solar Eclipse

Friday, February 16, 2018

7:00pm MST

Ascension Lutheran Church 1220 West Magee Road, Tucson, AZ

 

Handyman Corner

By Tom, W8TK

Kit of the month: Kit building class details to be announced at the March Meeting

Project: Repeater and D-Star update by Howard, KC7AC and Jim W5ZIT

 

HAMSCI and the 2017 Solar Eclipse

Presented by Nathaniel Frissell, W2NAF

seqp t02 

On August 21, 2017 a total solar eclipse caused the moon's shadow to traverse the United States from Oregon to South Carolina in just over 90 minutes. This caused large-scale changes in ionospheric densities, which were detected as changes in high frequency (HF) radio propagation during the Solar Eclipse QSO Party (SEQP), a ham radio contest-like citizen science experiment organized by the Ham Radio Science Citizen Investigation (hamsci.org). During the SEQP, amateur radio operators generated over 2.5 million observations by sampling random HF communication paths. Observations were recorded both by participant logs and fully-automated systems such as the Reverse Beacon Network (RBN), PSKReporter, and WSPRNet. In this presentation, I will show early science results based on analysis of RBN data. This includes evidence that the eclipse shadow enables an increased number of successful HF links 7 MHz and below, a lengthening of 7 MHz communication paths, and a reduction in 14 MHz signal strengths. This suggests a reduction of D-region absorption and a weakening of the E and F layers of the ionosphere.

Our Featured Presenter:

Nathaniel Frissell, W2NAF, is a research professor with the New Jersey Institute of Technology Center for Solar-Terrestrial Research. Nathaniel’s interest in ionospheric science began in middle school when he was introduced to amateur radio through scouting. He earned his B.S. in Physics and Music Education from Montclair State University and his M.S. and Ph.D. in Electrical Engineering from the Virginia Tech SuperDARN Laboratory. His Ph.D. dissertation is entitled "Ionospheric Disturbances: Midlatitude Pi2 Magnetospheric ULF Pulsations and Medium Scale Traveling Ionospheric Disturbances.” Nathaniel is an Eagle Scout and remains and active scouter. He holds an Extra class amateur radio license and founded the Ham Radio Science Citizen Investigation (HamSCI) project. Nathaniel is a co-advisor to the NJIT Amateur Radio Club, K2MFF.

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.