• 7:00 PM
• Fire District 6 Training Room; 2123 Jackson Highway; Chehalis, WA

1. AC Circuit Fundamentals - Part 4 - Filters
2. WSPR
   
   
3. Potpourri

AC Circuit Fundamentals - Part 4 - Filters:

1. http://www.ibiblio.org/kuphaldt/electricCircuits/
2. https://eng.libretexts.org/Bookshelves/Electrical_Engineering/Electronics/AC_Electrical_Circuit_Analysis%3A_A_Practical_Approach_(Fiore)
3. The ARRL Handbook for Radio Communications 2018

WSPR:

1. "A Cost Effective WSPR Beacon Transmitter;" Dhiru Kholia & Bradshaw Lupton, Jr.
   May/June 2025 QEX, pp. 3-5
2. WSJT-X User Guide:https://wsjt.sourceforge.io/wsjtx-doc/wsjtx-main-2.7.0.html
3. "WSPRing Around the World" QST November 2010:
   https://wsjt.sourceforge.io/WSPR_QST_Nov_2010.pdf
4. Wikipedia "WSPR (amateur radio software):
   https://en.wikipedia.org/wiki/WSPR_(amateur_radio_software)
5. WSPR Protocol:https://swharden.com/software/FSKview/wspr/

PC817 Photocoupler:

1. "PC817 Deries Datasheet by Sharp Microelectronics":
   https://www.digikey.com/en/htmldatasheets/production/34186/0/0/1/pc817-series