FOR 160 AND 80 METERS July 2016 K9MBQ ANTENNAS Cant Have Too Many 6 20M 4 EL STEPPIR Beam on US Tower MCrankup 75 ft 10160M 265 ft WINDOM Off Center Fed Dipole w Vertical piece ID: 695280
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Slide1
K9MBQ ANTENNA THOUGHTS
and COAX VERTICALFOR160 AND 80 METERS
July 2016Slide2
K9MBQ ANTENNAS – Can’t Have Too Many!
6 – 20M: 4 EL STEPPIR Beam on US Tower M/Crank-up @ ~ 75 ft10-160M: 265 ft WINDOM (Off Center Fed Dipole w/ Vertical piece) 10, 15, 20, 40M: HUSTLER 4BTV Vertical w/ ~ 30 grd Radials40M: 4 SQUARE VERTICAL SYSTEM . . . 4 Phased 40M ¼ Wave Verticals w/ 36-32 ft Radials under each (
Grd
Mounted)
80M: Inverted-V for CW (Low) end of Band; Center on tower @ ~72 ft80/160M: COAX Inverted – L w/ 6 Elevated RadialsReceive Only for 40, 80, 160M – K9AY LOOP System . . . “Poor Man’s Beveridge” Use Solo when transceiver has external Rcv Ant connectionI Use both solo and in Diversity Receive with a second Receiver (my K3 has two) and the transmit Ant on the main Receiver . . . Excellent hearing!!Include a Separate Receive Ant in your station if your Transceiver has the Jack . . .
New HAMs - First
Pri
- Windom; 2nd - Elevated Vertical Slide3
BACKGROUNDWhy a COAX INV-L? – Get DXCC on 160MWindom 160 (265
ft) in use – OK on 160 (80+ countries), but too lowMar 2012 QST Article by Scott – K4VWK on Resonant 80/160, elevated radial Coax Inverted “L” got my attention No Capacitance needed at BaseI had the spaceAlways wanted to try and Inverted “L”Slide4
CONFIGURATIONVert
is 65 ft RG8Radials – 100 ft #18 Electric Fence Wire“L” 65 ft #14 Wire, plus extensionsSlide5
TUNING LENGTHSK4VWK
K9MBQ- 1: 70 FT- 2 : NA- 3: 4 FT- 4: 8 FT- 5: NATop at ~ 60 ft vs 65
ft
, w/ coax loop at bottom
Elevation and Angle of “L” change LoadingSlide6
ANT HEIGHT EFFECTSlide7
BANDWIDTH160 W/ #1 (70 FT L) – 1820 TO 1910, SWR < 1.5:1
80: 3750 – 3820, SWR < 1.5:1Slide8
MECHANICSK9MBQ used a plastic electric box cover
Alligator clips from Radio ShackSlide9
K9MBQ GROUND CONNECTORS AND BASE MOUNTSlide10
CENTER SUPPORT AND GROUND ROD CONNECTIONSlide11
SECTION JUMPERS AND HI-TECH RADIAL INSULATORSSlide12
HOW DOES IT PLAY?160: Excellent into EU and Caribbean80: Armchair QSOs in DX Window into EU & VK/ZL
ARRL Phone Contest – 6 new countries on 160 on SSBResonant, no tuner; 1500W load w/o issues.Got 160M DXCC!Slide13
BOTTOM LINEEasy to construct – no unique parts, but need a 65
ft supportPlays well – Good DX AntennaNo Extensive Ground Radial SystemMy 40M 4 Sq has 6K+ ft of #14 wire in radialsVertical COAX Insulation Prevents Tree Conductivity; it is the Loading CapacitorManual Band Changing tolerableGlad I Built!!Slide14
QUESTIONS?Slide15
BACKUP CHARTSSlide16
160M Radiation Pattern160MSlide17
Antenna Diagram160 DiagramSlide18
100K Tons of MOBILE US SOVEREIGTY!