MY 80 METER WIRE FOUR SQUARE VERTICAL ARRAY
THIS PICTURE IS THE SIMPLE FEED POINT OF MY 80 METER FOUR SQUARE. I AM USING RG-11 COAX, CONNECTED DIRECTLY TO THE RADIATOR AND THE GROUND RADIALS.
THIS PICTURE IS THE LOCATION OF THE ARRAY. THE ARRAY IS WIRE AND THE WIRE RADIATORS ARE HANGING FROM THE TREES. LOOK CLOSE, AND YOU CAN SEE THREE WHITE JUGS THAT COVER THE FEED POINTS.
THIS PICTURE IS THE VIEW FROM MY QTH TOWARD EUROPE. MY QTH IS AT ABOUT 3,000 FEET !
THIS AREA IS KNOWN AS " THE BLUE RIDGE
I have received many questions and comments about my"primitive" 80 meter four square vertical array. Each vertical is constructed of number 12, stranded, insulated copper wire. A ground buss of number 4 copper wire, with 4***8 foot ground rods, circles each vertical and the 164, 1/4 wave radials (FOR EACH VERTICAL) are connected to this ground buss. Total number of 8 foot ground rods in the array** 17 **This includes the one I have in the middle of the array at the hybrid phase system. I have a total of over 8 miles of copper wire radials under the array. Total cost of each vertical, about 23 dollars!! ( I buy my wire at flea markets ). Each vertical is suspended from a large oak tree. The array is located in a dense growth of oak trees together with other plants and briars.
UP DATE**I re-tuned my "primitive" 80 meter 4 square vertical array on 11-9-08**With 110 watts into the array and the antenna TUNE frequency at 3.715 kHz, the connected array results are as follows**The array resonates at 3.791 kHz which, as you can see, is up the band about 76 kHz**The dumped power is less than 1/2 watt in all directions**The feed point impedances are between 39 ohms and 41 ohms on all antennas**After the re-tune process the F/B came up a few DB**THE SECRET**To achieve the BEST F/B on a four square vertical array***ALL the verticals MUST be on the same resonant frequency****Two of my verticals were off frequency***this was due to tree growth over the last 10 years**the NE vertical was a Little short and the NW vertical was a Little long**The TREES have an affect on the resonant frequency in MY system and all the verticals ARE NOT the same physical length ! ! !
UPDATE on my "primitive" 80 meter four square***and***my 40 meter elevated four square array**. I was asked by John (G4ATA) to post some pictures of the arrays on his** " 4 square website "**these pictures are located at www.4-square.co.uk/na/na4l