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
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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