Tag: equipment

Rockwell Collins Sold to United Technologies

United Technologies has acquired avionics maker Rockwell Collins in a $30-billion deal. United Technologies said it wants to further enhance its role in aviation for both its military and commercial customers in the area of new aircraft connectivity systems.

Collins Radio and later Rockwell Collins for many years manufactured top-tier Amateur Radio equipment. Art Collins, W0CXX, founded Collins …

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Open Wire Line

I have been using balanced line for years to feed various antenna configurations here at the station. Originally, with lighter power handling requirements, I used the 450 Ohm #14 “window line” which sort of works but at a tremendous cost due to the marginal dielectric and its cross section to conductor ratio. That resulted in tremendous swings in matching because of rain, whipping around in the wind, and even heating in the sun.

I started to construct and experiment with the…

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The Bouvet Island 160m Vertical

Tim Duffy, K3LR, reports: The DX Engineering and Bouvet Island teams have worked together to design an efficient 90 foot top loaded 160 meter vertical antenna that can be installed quickly and safely on Bouvet Island by the 3Y0Z team this January

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MFJ-1982 and counterpoise or ground

I searched, but could not find anything on this, and the MFJ manual on this is sketchy. I was planning to get an MFJ 1982 which is an end fed half wave antenna at 80 meters, and functions as multiple half waves and shorter wavelengths. It claims to cover 40, 20 and 10 meters within 3:1 SWR, so should make the transmitter happy:)

Question, how long a counter poise should I have to prevent common mode currents on the coax? I have read several things, all sounding very wise and…

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