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1993-01-27
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69 lines
SUBJECT: LPA Series - 500 MHz to 1300 MHz
USE: Amateur Bands 33cm & 23cm, directional scanning.
Note: See ARRL Antenna Handbook under LPA construction
Tau = 0.96
Sigma = 0.18
B = 2.6
COT alpha = 18
BAR = 1.32176
Bs = 3.436576
Lambda max = 1.968
Lb = [0.25(1-(1/Bs))COT alpha)Lambda max] = 6.3-ft
N = 1 + (log Bs / log (1/Tau)) = 31
The following are in inches, two of each required (L)
------------------------------
L1 = 5.904 d1,2 = 4.248
L2 = 5.668 d2,3 = 4.073
L3 = 5.441 d3,4 = 3.915
L4 = 5.223 d4,5 = 3.758
L5 = 5.014 d5,6 = 3.608
L6 = 4.813 d6,7 = 3.464
L7 = 4.62 d7,8 = 3.325
L8 = 4.435 d8,9 = 3.192
L9 = 4.258 d9,10 = 3.064
L10 = 4.088 d10,11 = 2.941
L11 = 3.924 d11,12 = 2.823
L12 = 3.767 d12,13 = 2.71
L13 = 3.616 d13,14 = 2.6
L14 = 3.471 d14,15 = 2.496
L15 = 3.332 d15,16 = 2.3
L16 = 3.2 d16,17 = 2.208
L17 = 3.072 d17,18 = 2.12
L18 = 2.949 d18,19 = 2.035
L19 = 2.831 d19,20 = 1.954
L20 = 2.718 d20,21 = 1.876
L21 = 2.609 d21,22 = 1.8
L22 = 2.505 d22,23 = 1.728
L23 = 2.405 d23,24 = 1.659
L24 = 2.309 d24,25 = 1.593
L25 = 2.217 d25,26 = 1.53
L26 = 2.128 d26,27 = 1.469
L27 = 2.043 d27,28 = 1.41
L28 = 1.961 d28,29 = 1.35
L29 = 1.883 d29,30 = 1.296
L30 = 1.808 d30,31 = 1.244
L31 = 1.736
Zt =2.952 Sigma' = Sigma/sqrt Tau = 0.1837
Ro = 50
Zav = 302.56
Zo = Ro^2/(8(Sigma'(Zav))) + Ro(Sqrt(Ro/(8(Sigma'(Zav))) + 1) = 55.9
Gain = 10.5 dBi
S can be calculated from the ARRL Antenna Handbook.
Enjoy! Next is the 67cm LPA! The 500-1300 MHz LPA is currently under
construction at KB4YLY's QTH and will be in use in MARCH 93!
-WS