lpas5.art

一个很小和天线计算程序

LPA Series - 50-54 MHz 

USE:  Amateur Band 6m

Note: See ARRL Antenna Handbook under LPA construction

Tau = 0.92
Sigma = 0.17
B = 1.08
COT alpha = 8.5
BAR = 1.42
Bs = 1.534
Lambda max = 19.68-ft

Lb = [0.25(1-(1/Bs))COT alpha)Lambda max] = 14.75-ft

N = 1 + (log Bs / log (1/Tau)) = 6

The following are in inches, two of each required (L)
------------------------------
 L1 = 59.94               d1,2 = 40.97
 L2 = 55.22               d2,3 = 37.69
 L3 = 50.90               d3,4 = 34.67
 L4 = 46.90               d4,5 = 31.90
 L5 = 43.20               d5,6 = 29.35
 L6 = 39.81               
   
                 

Zt = 29.52  Sigma' = Sigma/sqrt Tau = 0.17723
Ro = 50
Zav = 200.7 using 0.35 dia elements
Zo = Ro^2/(8(Sigma'(Zav))) + Ro(Sqrt(Ro/(8(Sigma'(Zav))) + 1) = 63.0 
Gain = 8.5 dBi
S can be calculated from the ARRL Antenna Handbook.


Next is the element attachment.  SEE BELOW!!!!

*************************************************************
*    NOTE: The boom on all these LPAs is 1-inch diameter.   *
*    All elements have a 0.9-in adjustment in the length    *
*    to compensate.  Sorry about that.  The Freq file will  *
*    have the proper statement put in.                      *
*************************************************************


-WS