28 Elements XPOL 2m Super Yagi EME Antenna PA144-XPOL-28-9 with superior G/T -0.79
Superior G/T -0.79 EME and tropo XPOL 2m Yagi antenna PA144-XPOL-28-9
Very high gain 144MHz EME-Tropo antenna with highest suppression of all sidelobes. Wideband operation 144 - 145 MHz.
|Frequency Range:||144 - 145 MHz|
|Free Space Forward Gain:||16.63 dBi|
|Front to Back Ratio:||36 dB|
|3 dB Beamwidth:||28.4°|
|Nominal Input Impedance:||50 Ohm|
|SWR Across Entire Band:||< 1.2|
|Maximum Power Input:||2 x 1000 W|
|Matching Method:||Direct feed through RG142 teflon common mode choke.|
|Connectors:||2 x "N"|
|Boom length:||9.24 m|
|Boom :||40 x 40 mm different wall thickness|
|Element Diameter:||All elements 8 mm|
|Longest element:||1.03 m|
|Guy rope support:||Black painted Fiberglass rod 1m OD 25 mm|
|No. of elements:||2 x 14 (28 elements)|
|Element position:||Slant configuration +-45deg|
|Turning radius:||5 m|
|Mounting Mast Diameter:||5/4" - 2-3/4" 43-70 mm or Square 40, 50mm|
|Survival Wind Speed:||150 km/h|
|Transportation Packed Size Length:||2.5 m|
|Net Weight:||16.5 kg|
TANT G/T -0.79:
Or on W7GJ location: http://www.bigskyspaces.com/w7gj/VE7BQH%20Charts.xls
Press "VE7BQH 144 MHz Tables" ROW 256 and 257. Or search "PA144"
One of the best performing antennas on the table for its sizes.
PA144-XPOL-28-9 Antenna, measured characteristics with calibrated HP8753ES Network Analyzer.
Measured S11 144 - 145 MHz at antenna connector:
Measured VSWR 144 - 145 MHz at antenna connector:
One of the most important parameter in the "X" or "+" configuration of antennas is coupling.
We have measured on this PA144-XPOL-28-9 just excellent:
Better than -35 dB in the prime part od 2m band. Which is more than sufficient for any purpose.
We consider that mechanical construction is even more important than electrical parameters. That will lead to many years of trouble free operation.
Dipole, balun, balun holder and element holder construction:
Boom-to mast bracket with guy rope support XPOL Antenna PA144-XPOL-28-9
Black acrylic painted Fiberglass rod 1m OD 25 mm
Boom to mast bracket with guy rope support. Protected industrial design.