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Imbalance in doublet antennas.
Good Day all!
Now I have my Kenwood ts-820S going on TX again I must turn my attention to another problem. This is entirely a result of my house and section layout. I have a G5RV antenna supported by a 7.5 metre mast in the centre on a quite steeply sloping section. The antenna runs East/West. Now thw western (high) end is supported by my upper fence posts on top of a timber retaining wall totalling about 4 metres AGL. The antenna wire is substantially horizontal at that end. The eastern end however has the problem of a mast of any greater than 3.5 metres high interfering with our neighbours view and they are very good neighbours! As a result the eastern end of the G5RV slopes down at about 20 degrees and is only 3.5 metres AGL at the end. Now I have noticed that my "Z" match antenna tuner is much more critical in adjustment than it used to be with a horizontal G5RV at my previous QTH. Obviously the capacitance to ground will be very different between the 2 sides of the doublet and I have a fair amount of mains borne QRN here. Has anyone else sorted this problem, it will not be easy to move the antenna as my section is only 860 M2. &3's Cliff Wright ZL1BDA ex G3NIA |
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