Leading research institute in Russia in the field of marine navigation, gyroscopy and gravimetry: marine navigational equipment; inertial systems, gyroscopic devices and multipurpose systems, fine electromechanical devices; wind-driven power plants; medical equipment. Also publishes the (All-Russian) journal "Gyroscopy and Navigation".
http://www.elektropribor.spb.ru/enfrset.html
Dx bulletins in English and Portuguese by Pedro Namora. DX-peditions locations and operating times.
http://www.qsl.net/ct1ekd
A Portuguese amateur and his HAM radio resource. Includes photographs, propagation information, and QSL data.
http://www.qsl.net/ct1ete
Roger Gonzaga of Portugal with QRP information, his profession as a surgery professor and club affiliations.
http://www.qsl.net/ct1ett/
very simple circuit to interface a current loop sensor to an input which is designed for a voltage
http://www.4qdtec.com/curli.html
Also describes a Domestic heating boiler control schematic.
http://www.4qdtec.com/csrd.html
Sources and mirrors are so closely related that it is sometimes difficult to differentiate between them.
http://www.4qdtec.com/csm.html
http://w1.859.telia.com/~u85920178/use/filt1.htm
Send and receive morse code via your PC. Includes source code and download.
http://taggart.glg.msu.edu/wb8dqt/cwpage.htm
http://www.mrs.bt.co.uk/dubus/8601-1.pdf