[TowerTalk] Heliax Bending Radius

[Bill Hider, N3RR]

 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





--
FAQ on WWW:               http://www.contesting.com/towertalkfaq.html
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm