Packet Primer
New to Packet? Maybe need a refresher? Just curious? Take a look at INTRODUCTION TO PACKET RADIO to get your packet station (and yourself) up to speed.Weather Observer Handbook
An informative essay by Tim Vasquez - released to the Amateur community. See the downloads section to get your copy.NVIS, or Near Vertical Incidence Skywave
Refers to a radio propagation mode which involves the use of antennas with a very high radiation angle, approaching or reaching 90 degrees (straight up), along with selection of an appropriate frequency below the critical frequency, to establish reliable communications over a radius of 0-200 miles or so, give or take 100 miles. Although not all radio amateurs have heard the term NVIS, many have used that mode when making nearby contacts on 160 meters or 80 meters at night, or 80 meters or 40 meters during the day...Click this link to read more of this excellent article about NVIS.