BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/New_York BEGIN:DAYLIGHT DTSTART:20240310T030000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:EDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20241103T010000 TZOFFSETFROM:-0400 TZOFFSETTO:-0500 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:EST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20241007T161651Z UID:7E746DE7-6C3A-4AEE-B894-161AC427C5F9 DTSTART;TZID=America/New_York:20241004T150000 DTEND;TZID=America/New_York:20241004T160000 DESCRIPTION:Studying the D-Layer of the Ionosphere is difficult due to the low plasma density that tends to occur at the bottom of the Ionosphere\, n ecessitating relatively low frequency signals in order to probe the overhe ad conditions. Ionosondes\, the sensors typically used to probe the Ionosp here\, mostly bottom out at 1MHz and\, due to the need to operate across a wide bandwidth\, their antennas are very insensitive at those frequencies . My goal is to build a passive collection system utilizing local MF stati ons (i.e. WDAO at 1.21MHz) as transmitters to collect long-term data on io nospheric conditions in the D- and bottom of the E-layer. The problem is t wofold: 1) the reflection path is expected to be HIGHLY lossy so there wil l be a strong direct path signal and a weak reflection path signal of inte rest 2) the extremely low frequency of the signals necessary make miniatur izing the antenna system difficult\, especially if (as expected) we will n eed to operate across multiple stations and frequencies over the course of the day. My current plan is to set up an array of ~5x crossed wire-wrappe d ferrite loop antennas as elements in conjunction with a variable capacit or to tune.\n\nCo-sponsored by: Wright-Patt Multi-Intelligence Development Consortium (WPMDC)\, The DOD & DOE Communities\n\nSpeaker(s): Dan\n\nAgen da: \nStudying the D-Layer of the Ionosphere is difficult due to the low p lasma density that tends to occur at the bottom of the Ionosphere\, necess itating relatively low frequency signals in order to probe the overhead co nditions. Ionosondes\, the sensors typically used to probe the Ionosphere\ , mostly bottom out at 1MHz and\, due to the need to operate across a wide bandwidth\, their antennas are very insensitive at those frequencies. My goal is to build a passive collection system utilizing local MF stations ( i.e. WDAO at 1.21MHz) as transmitters to collect long-term data on ionosph eric conditions in the D- and bottom of the E-layer. The problem is twofol d: 1) the reflection path is expected to be HIGHLY lossy so there will be a strong direct path signal and a weak reflection path signal of interest 2) the extremely low frequency of the signals necessary make miniaturizing the antenna system difficult\, especially if (as expected) we will need t o operate across multiple stations and frequencies over the course of the day. My current plan is to set up an array of ~5x crossed wire-wrapped fer rite loop antennas as elements in conjunction with a variable capacitor to tune.\n\nVirtual: https://events.vtools.ieee.org/m/437436 LOCATION:Virtual: https://events.vtools.ieee.org/m/437436 ORGANIZER:a.j.terzuoli@ieee.org SEQUENCE:8 SUMMARY:AM Band Antenna Array URL;VALUE=URI:https://events.vtools.ieee.org/m/437436 X-ALT-DESC:Description: <br /><p>Studying the D-Layer of the Ionosphere is difficult due to the low plasma density that tends to occur at the bottom of the Ionosphere\, necessitating relatively low frequency signals in orde r to probe the overhead conditions. Ionosondes\, the sensors typically use d to probe the Ionosphere\, mostly bottom out at 1MHz and\, due to the nee d to operate across a wide bandwidth\, their antennas are very insensitive at those frequencies. My goal is to build a passive collection system uti lizing local MF stations (i.e. WDAO at 1.21MHz) as transmitters to collect long-term data on ionospheric conditions in the D- and bottom of the E-la yer. The problem is twofold: 1) the reflection path is expected to be HIGH LY lossy so there will be a strong direct path signal and a weak reflectio n path signal of interest 2) the extremely low frequency of the signals ne cessary make miniaturizing the antenna system difficult\, especially if (a s expected) we will need to operate across multiple stations and frequenci es over the course of the day. My current plan is to set up an array of ~5 x crossed wire-wrapped ferrite loop antennas as elements in conjunction wi th a variable capacitor to tune.</p><br /><br />Agenda: <br /><p>Studying the D-Layer of the Ionosphere is difficult due to the low plasma density t hat tends to occur at the bottom of the Ionosphere\, necessitating relativ ely low frequency signals in order to probe the overhead conditions. Ionos ondes\, the sensors typically used to probe the Ionosphere\, mostly bottom out at 1MHz and\, due to the need to operate across a wide bandwidth\, th eir antennas are very insensitive at those frequencies. My goal is to buil d a passive collection system utilizing local MF stations (i.e. WDAO at 1. 21MHz) as transmitters to collect long-term data on ionospheric conditions in the D- and bottom of the E-layer. The problem is twofold: 1) the refle ction path is expected to be HIGHLY lossy so there will be a strong direct path signal and a weak reflection path signal of interest 2) the extremel y low frequency of the signals necessary make miniaturizing the antenna sy stem difficult\, especially if (as expected) we will need to operate acros s multiple stations and frequencies over the course of the day. My current plan is to set up an array of ~5x crossed wire-wrapped ferrite loop anten nas as elements in conjunction with a variable capacitor to tune.</p> END:VEVENT END:VCALENDAR