I have about 350 feet of quad-shield RG-6 going out to a receiving antenna hub which has a 20-db ARR preamp on the end of the line, followed by an 8-way relay switch. The feedline is lying on the ground, or more correctly on the stubble of a mowed hayfield. At the moment, it has only one BOG on it, but I plan to add other BOGs and a K9AY loop for some comparative tests. The feedline has a center tapped common mode choke about 15 feet from the hub, a la ON4UN and K9YC references - 14 turns of RG-6 on each of 2 #31 toroids.
My question is this. If I disconnect the one BOG, and listen to the feedline and preamp, how quiet should it be? How would I go about testing its quietness? If it is not quiet enough in this configuration, what would my next step be? Another common mode choke at the shack entrance? -- 73, Pete N4ZR The World Contest Station Database, updated daily at www.conteststations.com The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com, spots at telnet.reversebeacon.net, port 7000 and arcluster.reversebeacon.net, port 7000 _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK