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[TowerTalk] Heliax Bending Radius

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Subject: [TowerTalk] Heliax Bending Radius
From: n3rr@erols.com (Bill Hider, N3RR)
Date: Wed, 28 Oct 1998 04:02:39 +0000

 Riki:

The FHJ cable was discontinued over 20 years ago. It is said to have been 
replaced due
to its poor long-term attenuation stability. The attenuation per foot increases 
overt
time.  It is the for-runner to the current LDF- series. The 1/2 inch version 
(LDF-4-50A)
specs (from the Andrew Catalog 37, which I have on CD ROM) are:

FREQ       ATTN (dB/100ft)         ATTN (dB/100m)        Av rage Power (KW)
0.5                      0.046                         0.152
40.0
1.0                      0.066                         0.217
35.1
1.5                      0.081                         0.266
28.6
2                         0.094
0.308                             24.8
10                       0.211                         0.692
11.0
20                       0.300                         0.985
7.75
30                       0.369
1.21                               6.31

Minimum Bending Radius, in (mm) 5 (125)
Number of Bends, minimum (typical) 15 (50)

Hope this helps..
Bill, N3RR





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