Long Island DX Association (LIDXA) Presented by Ed Whitman, K2MFY

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Presentation transcript:

Long Island DX Association (LIDXA) Presented by Ed Whitman, K2MFY HRU 2018 Long Island DX Association (LIDXA) Introduction to DX Radio Propagation Presented by Ed Whitman, K2MFY

Earth is very unique in that we have an atmosphere supporting layers of ionized gases.

Radiation varies hourly, seasonally, geographically between earth and sun. Affected by 11-year sunspot cycles. (Also long term sunspots averages over 110 year cycles.)

Propagation around the earth may be by ground, line of sight, sky wave, or ducting.

Gray line propagation is the transition region between daylight and darkness. Long path propagation is propagation across the longer arc of the great circle between two stations, particularly in darkness; vs. short path propagation.

Good reference sources: The New Shortwave Propagation Handbook by Jacobs, Cohen, & Rose. 1995, available CQ bookstore, etc. Radio Propagation-Principles & Practice by Ian Poole, RSGB. 2004 ARRL Antenna Book (23nd Edition) by ARRL Staff. 2015 Propagation and Radio Science (First Edition) by Eric P. Nichols, KL7AJ (and ARRL Staff) 2015