This article, originally in Soaring (Feb 2002) was updated recently to
include information on the Trig TT21 transponder. You can download it from

http://tinyurl.com/yg76qo9

It will also be available on the Soaring Safety Foundation website later
this month:

http://soaringsafety.org/

--
Eric Greenwell - Washington State, USA (netto to net to email me)

- "Transponders in Sailplanes - Jan/2010" also ADS-B, PCAS, Flarm tinyurl.com/yg76qo9

- "A Guide to Self-launching Sailplane Operation" Much of what you need to know tinyurl.com/yfs7tnz