Ham Radio Activities at Marshall Space Flight Center during the 2017 Total Solar Eclipse: Transmitting Node
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1 Ham Radio Activities at Marshall Space Flight Center during the 2017 Total Solar Eclipse: Transmitting Node HamSCI Workshop February 23-24, 2018 NJIT, Newark, NJ Jesse McTernan, USRA/MSFC (KN4EZR) Linda Krause, MSFC (K0DRK) Ghee Fry, MSFC (WL7C)
2 Ham Radio Activities at Marshall Space Flight Center Part 2: Transmitting Node
3 Solar activity on Monday, 21 August 2017 was relatively quiet Parameter Symbol Value Unit Radio Flux F 87.1 sfu Sun spots R 43 X-ray background flux A,B,C,M,X B2.6 (W/m^2) K-index Kp 1 Approximate time of totality C3.0 Class (start-17:39 max-17:57 end-18:01) Space weather data from NOAA SWPC archives X-ray activity plot from spaceweatherlive.com
4 Physical location and setup Location lat lon Maidenhead EM67ia Local eclipse contact times (CDT = UTC 5) C1 C2 C3 C4 (Begin Partial) (begin total) (end totality) (End Partial) 11:56:48 13:24:57 13:27:24 14:51:43 CDT 16:56:48 18:24:57 18:27:24 19:51:43 UTC Image from Google Maps
5 Physical location and setup Christian Way Farm Near Hopkinsville, KY corn field grass
6 Physical location and setup: Antenna and Radio Alpha Antenna 80 Watts 6-80M complete multiband 500W portable antenna Two mistakes: didn t elevate antenna (5 feet) Installed matching network backwards Icom 7300 (image from
7 The antenna was designed to operate on multiple ham bands SWR values from manufacturer Alpha Antenna SWR Note: the SWR for the 40-m band is around 1.5 We measured SWR values less than 3.0 (MFJ-226), even with the matching network installed incorrectly Frequency [MHz] and Band [m]
8 Relevant antenna characteristics Electrical Characteristics Frequency range Polarization RF power capacity (watts) Input impedance Radiation Pattern: Azimuth Elevation MHz (54 MHz when mounted upon an optional tripod) Horizontal and Vertical polarization 500 PEP SSB, 250 CW, or 100 digital 50 ohms Omnidirectional/Semi-Directional NVIS & DX Physical Characteristics: Wind and ice Maximum Height erected MilStick survives 70 MPH wind with no ice 13 feet when mounted on the Jaw Mount and 19 feet when mounted upon an optional tripod Minimum foot-print required 3 foot by 3 foot + 25 foot NVIS-2.1 Minimum Weight 2.00 pounds (MTCH-2.1 & MLSTK-2.1.XX)
9 Data analysis (all contacts) Dotted line Asterisks Magenta lines Time independent
10 Data analysis (all contacts)
11 Data analysis (contacts on 20-m only)
12 Data analysis (contacts on 30-m only)
13 Data analysis (contacts on 40-m only) 2 unique DE stations
14 Discussion Stats: 30 total contacts day of eclipse 12 contacts (40 meter) 10 contacts (30 meter) 8 contacts (20 meter) 10 unique DE stations 11 (most contacts with same DE) Wanted to use 80m (see lesson learned) Observations Very limited internet! Made dynamic experimentation nearly impossible Apparent directionality of contacts (as expected with NVIS) Low number of data points Lack of confirmed DE/DX locations Did not contact MSFC s receiving node (WL7C) Lat: 36.50N, Lon: 87.34W, Distance: km Work remains to extract science from this dataset Band (meters) Frequency Range (MHz) Range (khz) Select ham-radio band plan, for reference Future plans
15 Future Plans include a long-term receiving node at NSSTC Active Receive Antenna Concrete roof (don t think there is a metal layer) design review
16 The receiving node (RBN, WSPRnet, PSKReporter, etc.) is almost running in phase 1 Equipment List: Active Receive Antenna (DXE-ARAV3) Surge Protector (DXE-RLP75FF) SDR Hardware (SDRplay RSP2pro) SDR Software (SDRuno) Virtual Audio Cables (VB-CABLE) CW Decoder (CW Skimmer) We are at this step
17 Future plans: ray tracing with AF-Geospace and PIM Preliminary Analysis Frequency = 7 MHz (40m) Elevation span = degrees Relevant ionospheric parameters Notice how NVIS signals penetrate the F layer. (70 and 90 degrees) AF-Geospace simulation using Parameterized Ionospheric Model (PIM) Caveat: no collisions Preliminary, not for reproduction
18 Future plans: ray tracing with IONOspheric Ray Tracing (IONORT) Simulated 7-MHz ray pointed toward WL7C 60.6 km (37.7 miles) away at various elevations (electron density profiles created using IRI-2016) 90 deg 70 deg 50 deg 30 deg 10 deg Preliminary, not for reproduction
19 Future plans: ray tracing with IONOspheric Ray Tracing (IONORT) Simulated ray pointed toward WL7C 60.6 km (37.7 miles) away at 80-degree elevation (electron density profiles created using IRI-2016) zoom Frequency sweep 10 MHz 7 MHz 4 MHz Preliminary, not for reproduction
20 Conclusion Transmitted on 20m, 30m, and 40m from within totality using 80 watts and NVIS antenna We are establishing a receiving node at NSSTC (MSFC) RBN, WSPRnet, PSKReporter, other? We will use ray tracing to investigate why our DX and DE stations did not make contact We are hoping to apply our lessons learned during future eclipses!
21 Please connect with us: Experience setting up receiving nodes? Plans for future solar eclipses (2019, 2020, 2024)? Ray tracing? Thank you for your attention!
22 Extra slides
23 IRI-2016 IONORT D-region (collisions) Discrete electron density grids Lat, lon, height Sample output from IRI-2016 online August 21, 2017 Hour = Latitude = 30N Longitude = -75W
24
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