home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Ham Radio 2000
/
Ham Radio 2000.iso
/
ham2000
/
antenna
/
antennas
/
lpas5.art
< prev
next >
Wrap
Text File
|
1993-03-11
|
1KB
|
53 lines
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