<I was using a sloper for 160 mts from a 118ft tower and the 40-2CD was on top of this tower. So I couldn´t connect the 40-2CD in the RX ANT IN. So I switch the knob in my sixpack to listen in the 40 and then switch again to TX on the 160 antenna, hope this will not cause a problem in the rig?>
Here is a very major problem people with slopers should watch for. The sloper uses the tower as the counterpoise, and the tower structure has the same current at the connection point as flows into the sloper wire we call the antenna! If we have three amps of RF into the sloper, the tower is excited with 3 amps also!!! This means the 40 meter antenna on the tower, since it is a major part of the counterpoise for the sloper antenna to work against, has substantial element currents when using the sloper. I would use a disconnect relay with good isolation to disconnect and ground the center conductor of the 40 meter Yagi when using your sloper to transmit! Remember the 40 meter antenna is really a radial system for the sloper. This is a very good way to damage a receiver, and the little "low power" limiters that are often successful for minor problems should not be trusted in a case like this where one antenna is a directly connected part of the other antenna system. Years ago I measured the 80 meter Inverted V of a friend of mine who had a 160 sloper on the same tower, and he had almost 200 or 300 watts into a dummy load on the 80 meter antenna when using the sloper at 1500 watts on 160. Use a relay Jorge along with a regular small limiter and be sure it is 100% safe to be disconnected before transmitting with a limiter for backup. 73 Tom ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
