so I'm gathering up supply's for a LPDA build for 224-400mhz... 60" long boom LPDA - Logarithmic Periodic Dipole Antenna this is the calculations i got
**** Logarithmic Periodic Dipole Antenna ****
LPDA - Logarithmic Periodic Dipole Antenna
JavaScript Version 12.01.2014, based on ARRL ANTENNA BOOK, 17th ED.
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Min. Frequency : 224 MHz
Max. Frequency : 400 MHz
Boomlength : 57.350 inch
Gain : 8.13 dB
Elements : 11
tau : 0.899
sigma : 0.168
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Bandwidth (active region) : 1.62
Bandwidth (structural) : 2.89
Bandwidth (effective) : 1.79
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Element 1, Rod : 13.182 inch, Position : 0.000 inch, Diameter : 0.260 inch
Element 2, Rod : 11.854 inch, Position : 8.833 inch, Diameter : 0.240 inch
Element 3, Rod : 10.659 inch, Position : 16.775 inch, Diameter : 0.210 inch
Element 4, Rod : 9.585 inch, Position : 23.917 inch, Diameter : 0.190 inch
Element 5, Rod : 8.619 inch, Position : 30.340 inch, Diameter : 0.170 inch
Element 6, Rod : 7.751 inch, Position : 36.115 inch, Diameter : 0.160 inch
Element 7, Rod : 6.970 inch, Position : 41.308 inch, Diameter : 0.140 inch
Element 8, Rod : 6.267 inch, Position : 45.978 inch, Diameter : 0.130 inch
Element 9, Rod : 5.636 inch, Position : 50.178 inch, Diameter : 0.110 inch
Element 10, Rod : 5.068 inch, Position : 53.954 inch, Diameter : 0.100 inch
Element 11, Rod : 4.557 inch, Position : 57.349 inch, Diameter : 0.090 inch
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My question is... does the element diameter matter?. or can i go with 1/4" tube for the whole build?... it seems the dia that it is calling for would bent under a wind load or even a blue jay...
**** Logarithmic Periodic Dipole Antenna ****
LPDA - Logarithmic Periodic Dipole Antenna
JavaScript Version 12.01.2014, based on ARRL ANTENNA BOOK, 17th ED.
------------------------------------------------------------------------------
Min. Frequency : 224 MHz
Max. Frequency : 400 MHz
Boomlength : 57.350 inch
Gain : 8.13 dB
Elements : 11
tau : 0.899
sigma : 0.168
------------------------------------------------------------------------------
Bandwidth (active region) : 1.62
Bandwidth (structural) : 2.89
Bandwidth (effective) : 1.79
------------------------------------------------------------------------------
Element 1, Rod : 13.182 inch, Position : 0.000 inch, Diameter : 0.260 inch
Element 2, Rod : 11.854 inch, Position : 8.833 inch, Diameter : 0.240 inch
Element 3, Rod : 10.659 inch, Position : 16.775 inch, Diameter : 0.210 inch
Element 4, Rod : 9.585 inch, Position : 23.917 inch, Diameter : 0.190 inch
Element 5, Rod : 8.619 inch, Position : 30.340 inch, Diameter : 0.170 inch
Element 6, Rod : 7.751 inch, Position : 36.115 inch, Diameter : 0.160 inch
Element 7, Rod : 6.970 inch, Position : 41.308 inch, Diameter : 0.140 inch
Element 8, Rod : 6.267 inch, Position : 45.978 inch, Diameter : 0.130 inch
Element 9, Rod : 5.636 inch, Position : 50.178 inch, Diameter : 0.110 inch
Element 10, Rod : 5.068 inch, Position : 53.954 inch, Diameter : 0.100 inch
Element 11, Rod : 4.557 inch, Position : 57.349 inch, Diameter : 0.090 inch
------------------------------------------------------------------------------
My question is... does the element diameter matter?. or can i go with 1/4" tube for the whole build?... it seems the dia that it is calling for would bent under a wind load or even a blue jay...
