TY - Generic T1 - Design and 3D Printing of the Grape 2 Enclosure T2 - HamSCI Workshop 2024 Y1 - 2024 A1 - Majid Mokhtari A1 - John Gibbons A1 - Nathaniel A. Frissell AB -

This poster presents the design of the 3D printed enclosure for the Grape 2 Personal Space Weather Station HF Doppler Receiver.

JF - HamSCI Workshop 2024 PB - HamSCI CY - Cleveland, OH ER - TY - Generic T1 - Detection of SuperDARN-Observed Medium Scale Traveling Ionospheric Disturbances in the Southern Hemisphere T2 - HamSCI Workshop 2024 Y1 - 2024 A1 - James P. Fox A1 - Joseph Klobusicky A1 - Nathaniel A. Frissell AB -

Traveling Ionospheric Disturbances are quasi-periodic variations in the plasma that exist in the upper atmosphere and they impact the propagation of radio waves. Medium Scale Traveling Ionospheric Disturbances (MSTIDs) are defined as TIDs which travel at 100-250 m/s and have periods within the 1 hour range. Previously, most of the existing research has focused on MSTIDs in the Northern Hemisphere. This project seeks to determine whether there is enough data available to recognize seasonal trends in MSTID occurrence in the Southern Hemisphere. Currently, we have found some success in applying the PyDarnMusic algorithm to identify periods of high and low MSTID activity in the southern hemisphere in SuperDARN and have had success in replicating an existing study on the Falkland Islands radar. Going forward, we hope to refine the techniques which were originally used to identify MSTIDs in the Northern Hemisphere for use on the Southern Hemisphere in order to gain a better understanding of their climatology.

JF - HamSCI Workshop 2024 PB - HamSCI CY - Cleveland, OH ER - TY - Generic T1 - Development of Back-End Software for the Grape 2 T2 - HamSCI Workshop 2024 Y1 - 2024 A1 - Cuong Nguyen A1 - William Blackwell A1 - John Gibbons A1 - Nathaniel Frissell AB -

This poster showcases several software tools developed to support the development and operation of the main Grape 2 system. G2console is a terminal-based interface that communicates with the data collection system, providing users with valuable information such as software versions, amplitude, frequency, GPS, and magnetometer metrics for viewing and diagnostics. GrapeSpectrogram is a data processing script that generates Dopplergrams, aiding developers in validating the system's operation. Additionally, we will discuss future project developments, such as integration with the Linux GPS background service (gpsd) to provide accurate timing to the Raspberry Pi, and DigitalRF as a more efficient method of data storage.

JF - HamSCI Workshop 2024 PB - HamSCI CY - Cleveland, OH ER - TY - Generic T1 - Development of HamSCI PSWS Ground Magnetometer and Data Visualization on the PSWS Central Website T2 - HamSCI Workshop 2023 Y1 - 2023 A1 - Hyomin Kim A1 - Nathaniel A. Frissell A1 - David Witten A1 - Julius Madey A1 - William D. Engelke A1 - Tom Holmes A1 - Majid Mokhtari A1 - Scotty Cowling A1 - Anderson Liddle A1 - Nicholas Muscolino A1 - Zhaoshu Cao JF - HamSCI Workshop 2023 PB - HamSCI CY - Scranton, PA ER - TY - Generic T1 - Detecting Large Scale Traveling Ionospheric Disturbances using Feature Recognition and Amateur Radio Data T2 - HamSCI Workshop 2022 Y1 - 2022 A1 - William D. Engelke A1 - Nathaniel A. Frissell A1 - Travis Atkison A1 - Philip J. Erickson A1 - Francis Tholley AB -

A Large-Scale Transient Ionospheric Disturbance (LSTID) is a traveling perturbation in ionosphere electron density with a horizontal wavelength of approximately 1000 km and a period between 30 to 180 minutes. These can be detected by SuperDARN HF radar and GNSS Total Electron Content measurements. Recently it has been discovered that these can also be detected in amateur (ham) radio signal reports, which are now being generated in vast numbers by operators world-wide. A machine-learning technique was developed to find patterns in these data that indicate the presence of LSTIDs using an object detection technique.

JF - HamSCI Workshop 2022 PB - HamSCI CY - Huntsville, AL ER - TY - Generic T1 - Data Collection from WWV, WWVH, and WWVB: A Histoanatomy of NIST's Radio Beacon Transmissions T2 - HamSCI Workshop 2021 Y1 - 2021 A1 - David Kazdan A1 - Kristina V. Collins AB -

Beacon radio stations WWV, WWVH, and WWVB are maintained by the National Institute of Standards and Technology for frequency and time of day distribution.  Their accuracy and power level are adequate to make the stations suitable for use as passive beacons in ionospheric sounding.  The signals' carriers are useful in measurements, and each of the modulation components has its own separate utility, as well. This poster describes several approaches to determining total path length rate of change from the stations to distant receivers through measurements of various signal parts. Tradeoffs for the several approaches in signal strength to noise ratio, ability to distinguish signals from multiple time standard stations, and other factors are discussed.

JF - HamSCI Workshop 2021 UR - https://hamsci2021-uscranton.ipostersessions.com/?s=65-9B-EB-D7-81-ED-65-2D-38-C6-5F-CB-F3-ED-B2-B0 ER - TY - Generic T1 - December 2020 Eclipse Festival Analysis T2 - HamSCI Workshop 2021 Y1 - 2021 A1 - Kristina Collins A1 - David Casente A1 - Joanna Elia A1 - Marius Mereckis A1 - David Meshnick AB -

A crowdsourced science experiment called the December 2020 Eclipse Festival of Frequency Measurement was carried out for the total solar eclipse across South America on December 14, 2020. Over 80 stations around the world recorded WAV files of 10 MHz time standard stations. We have undertaken to process and visualize this data, and identify geophysical features within it. This poster will summarize our work to date. 

JF - HamSCI Workshop 2021 PB - HamSCI CY - Scranton, PA (Virtual) UR - https://hamsci2021-uscranton.ipostersessions.com/?s=24-20-1F-16-09-FF-74-70-E0-78-1D-88-6D-21-D5-3F ER - TY - CONF T1 - Direction Finding: Analog and Digital Applications (ePoster) T2 - HamSCI Workshop 2020 Y1 - 2020 A1 - Nolan Pearce AB -

Amateur radio encompasses the building of hardware, the programming of different communications devices, and the integration of hardware and software. One popular amateur pastime, radio direction finding, requires a fair amount of technical knowledge to include antenna design and radio wave propagation in the VHF radio band. Participants use specialized directional antennas to find a bearing for an unknown signal. An intense understanding of antenna radiation patterns can be used to accurately identify the source of this signal. Simulation on computer programs through test equipment helps hobbyists fully understand the characteristics of their direction finding devices. However, direction finding can be approached from the electronic realm as well as the physical realm. Instead of just directional antennas, one can utilize Digital Signal Processing (DSP) with software‐defined radios to locate and identify unknown signals. Programs such as Matlab and GNURadio combined with hardware such as the KerberosSDR and HackRF fully utilize this avenue of signals intelligence. The dichotomy between “physical” direction finding and digital signal processing provides an interesting argument for use of one over another. While antenna‐focused direction finding relies on vast technical knowledge of propagation and gain, computer‐ based direction finding similarly requires computational knowledge with various signals and mathematical techniques. In addition, the two techniques serve almost divided purposes: while analog direction finding can locate a signal real‐time, DSP can be used to deconstruct and decode signals after their interception. One technique does not outweigh the other, as both have different use cases and applicability. This presentation will outline the basic approach to each avenue of direction finding and the advantages each technique holds. Hobbyists should learn from both techniques of direction finding to gain applicable skills in electromagnetic wave theory.

JF - HamSCI Workshop 2020 PB - HamSCI CY - Scranton, PA ER - TY - CONF T1 - Digital Mobile Radio Support of High Altitude Balloons for a 2017 Total Solar Eclipse Cloud Formation Experiment T2 - HamSCI Workshop 2019 Y1 - 2019 A1 - Michael Pappas AB -

Edge of Space Sciences (EOSS, eoss.org) is a Denver, Colorado based non-profit organization that promotes science and education by exploring frontiers in amateur radio and high altitude balloons. Two years prior to the total eclipse of the sun (21AUG17) we were approached by Colorado University Boulder Space Grant Consortium & NASA about flying a pair of balloons with high resolution cameras for the eclipse. They wanted a specific altitude (85,000 foot) at the total eclipse for their cameras which was going to occur in Southeastern Wyoming. They were looking for cloud formation during the eclipse and this was coordinated with three mobile Doppler radar trucks. We did a survey of the predicted landing zone (Southeastern Wyoming/Western Nebraska) and found that there was little to no cellular service and zero amateur repeater coverage. Terrain considerations negated the use of 2M or UHF simplex and HF didn’t have the right propagation. We designed a 4 site Motorola Digital Mobile Radio (DMR) system using IPSite connect with a combination of microwave and VSAT backhaul. We coordinated 4 sets of Emergency Special Event UHF DMR repeater frequencies from the Wyoming Frequency coordinator (W7QQA, Leonard Pearce). We located 4 sites and negotiated with the owners (including the use of the City of Torrington, Wyoming water tower) and ran Longley Rice coverage studies from each location. We rented and programmed 10 Motorola 4550 mobiles and installed them in the tracking and recovery crew vehicles and trained then on how to use them. We programmed up the mobiles with roaming lists and the system “pinged” every 15 seconds (1/4 mile at 60 MPH). All the tracking and recovery teams had to do was push the PTT and wait for the “go tone”. We used the second time slot to communicate with the Goshen County Sheriff Department who’s main 911 dispatcher during the eclipse was a Ham for use in the event there was a public safety issue in a location without cell coverage. We built and tested all of the repeaters and duplexers and double conversion UPS and kitted them up together with the feed lines and antennas. One site used Telewave ANT450D6 antenna set to cardioid pattern to put the RF energy where we needed it. Our Comms team of 6 installed the system over one weekend a week before the event. We did a “drive test” and determined that our Longley-Rice pattern studies were very conservative and the system coverage significantly exceeded the predicted coverage. The system covered more than 7,600 square miles of Southeastern Wyoming.

JF - HamSCI Workshop 2019 PB - HamSCI CY - Cleveland, OH ER - TY - CONF T1 - Doppler Shift from Earth-Orbiting Satellites T2 - HamSCI Workshop 2019 Y1 - 2019 A1 - Michael S. Miller A1 - Ethan S. Miller AB -

Doppler shift, which is easily observable as a change in frequency, is due to a change in the phase path between an emitter and observer over time.  The changing phase path contains information about the position of the emitter as well as the propagation medium.  This presentation describes an effort to estimate the Doppler shift of the now-defunct VO-52 (“HAMSAT”) satellite at 145 MHz and theoretical concepts of orbit determination by trilateration.  It is similar to work performed in the West during the early weeks of the Space Race that determined the orbit of Sputnik-I and led to the development of the satellite Doppler navigation (TRANSIT) technique.

JF - HamSCI Workshop 2019 PB - HamSC CY - Cleveland, OH ER - TY - CONF T1 - Developing a Solar Eclipse Simulation for Greater Good T2 - ARRL and TAPR Digital Communications Conference Y1 - 2017 A1 - J. S. Vega A1 - N. A. Frissell A1 - J. D. Katz A1 - J. D. Huba AB -

This paper presents our methodology for simulating the upcoming total solar eclipse that will be taking place on August 21, 2017. By taking advantage of a high-performance distributed computing cluster as well as a number of third-party scientific computing libraries we were able to efficiently simulate a large number of HF amateur radio contacts before, during, and after the upcoming eclipse. The data generated from the simulations allows us to peek into how the amateur radio community and radio propagation as a whole will be affected in preparation for the actual eclipse.

JF - ARRL and TAPR Digital Communications Conference CY - St. Louis, MO UR - https://www.tapr.org/pub_dcc.html ER - TY - CONF T1 - Dayside Ionospheric Response to X-Class Solar Flare Events Observed with Reverse Beacon Network High Frequency Communication Links T2 - Virginia Tech REU Symposium - Poster Presentation Y1 - 2015 A1 - Carson O. Squibb A1 - Nathaniel A. Frissell A1 - J. Michael Ruohoniemi A1 - Joseph B. H. Baker A1 - Robyn Fiori A1 - Magdalina L. Moses JF - Virginia Tech REU Symposium - Poster Presentation PB - Virginia Tech REU Program CY - Blacksburg, VA UR - http://hamsci.org/sites/default/files/article/file/Csquibb_REU2015_Poster.pdf ER -