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1993-02-08
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58 lines
LPA Series - 222-225 MHz
USE: Amateur Band 1.35m.
Note: See ARRL Antenna Handbook under LPA construction
Tau = 0.98
Sigma = 0.18714
B = 1.0135
COT alpha = 37.428
BAR = 1.2153
Bs = 1.2317
Lambda max = 4.4324
Lb = [0.25(1-(1/Bs))COT alpha)Lambda max] = 8.4-ft
N = 1 + (log Bs / log (1/Tau)) = 12
The following are in inches, two of each required (L)
------------------------------
L1 = 14.20 d1,2 = 9.956
L2 = 13.93 d2,3 = 9.757
L3 = 13.67 d3,4 = 9.562
L4 = 13.42 d4,5 = 9.371
L5 = 13.17 d5,6 = 9.184
L6 = 12.93 d6,7 = 9.000
L7 = 12.69 d7,8 = 8.820
L8 = 12.45 d8,9 = 8.644
L9 = 12.22 d9,10 = 8.471
L10 = 12.00 d10,11 = 8.302
L11 = 11.75 d11,12 = 8.136
L12 = 11.55
Zt =6.6686 Sigma' = Sigma/sqrt Tau = 0.189
Ro = 50
Zav = 223.024 (interesting for the frequency is being used at!)
Zo = Ro^2/(8(Sigma'(Zav))) + Ro(Sqrt(Ro/(8(Sigma'(Zav))) + 1) = 57.9607
Gain = 11.0 dBi
S can be calculated from the ARRL Antenna Handbook.
Next is the 2m LPA. Element attachment will be after the 6m
posting. 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