On 12/7/2018 12:53 AM, [email protected] wrote:
(1500W) "...has excellent RF properties..." "In more than 20,000 hours of 24 x 7 operation with the four StationPro's in the author's station, there has not been a single relay failure."
A somewhat more robust relay is the Omron MJN series. Besides being rated to hot switch 600VAC, they have a "dielectric strength" of "750 VAC, RMS 60 Hz across open contacts" and greater than 2,500 VAC across any other pair of terminals. I don't see why this voltage wouldn't apply to RF as well as 60 Hz, unless there is excessive heating of the insulation. In any event, this is good for 1500W in a 450 ohm line at 3:1 SWR. They work well for tuning a dipole or monopole across the 80 or 160 meter band by switching in capacitors. There can be substantial voltage across them. The MJN is considerably bigger/costlier than the Schrack, but not in the "contactor" class that is even bigger and costlier. (Available from Mouser). Rick N6RK _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
