At the risk of seeming to rain upon the parade, let's keep in mind that the 931 can at most provide a low-impedance path to "ground." Whatever that "ground" happens to be is what determines the success or failure of using the 931.
In almost all cases, adding a simple ground connection to a station with "rf in the shack" problems is not the solution and may, in fact, make matters worse. Very few earth grounds constructed by the typical amateur are very effective, presenting hundreds of ohms of connection resistance to the soil. The preferred approach is to find out where the rf is coming from and correct that situation. All coax cables entering the shack should be provided with baluns at the antenna feedpoint and again at the shack entrance if needed. Antennas that place the shack equipment at other than zero rf potential should be avoided. Finally, the most effective way to place the equipment at zero rf potential is the "driven ground." This consists of a 1/4 wave length of wire with one end connected to what is decided to be the station "ground" point and the other end unconnected. The wire can lay on the shack floor. It will carry induced current and radiate and thus is a source of RFI. But the open end will assume a high r-f potential thereby driving the connected end to very near zero potential. A wire for each band can be used if needed. 73, George W5YR Fairview, TX [EMAIL PROTECTED] http://www.w5yr.com _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
