300 ohm ladder line measureements

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From: Goran Hosinsky (hosinsky@royac.iac.es)
Date: Mon Apr 24 1995 - 05:46:33 EDT


       CONCLUSION: The 300 ohm ladder line is mot a low loss line in the
                   HF region. It is on par with RG17 but not as good as
                   any of the hardlines.

       Gang,

       I have for some time been doubtful about the published values
       for line loss for ladder line. This weekend I inaugurate my
       new RF-1 and did some measurements on a 300 ohm ladder line.

       Line type : The Wireman CQ 562 ladder line, 300 ohm
       Conductors: #18 AWG 19 strand
       Spacing : 0.335"

       Measured values for 100 feet:
       Zo : 270 ohm
       loss at 6 MHz: 0.30 dB
       loss at 28 MHz: 0.50 dB

       For comparison:
       ARRL handbook data loss at 28 Mhz: 0.18 dB
       Open wire air spaced from transmission
       line equations, same size and spacing
       of conductors loss at 28 MHz: 0.34 dB
                                          Zo : 337 ohm

       Saludos,

       Goran EA8YU hosinsky@royac.iac.es


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