[TowerTalk] Multiple half waves of 75 ohm coax

[Pete Smith]

Following forwarded by permission from W4ZV, a non-subscriber:


>        For the past year I've been using 242.29' of 3/4" 75 ohm .871 vf
>for my 10 meter stack.  I cut this to be exactly 12 full wavelengths on 10
>at 28.3 MHz using a MFJ 259B.  Using the MFJ at one end with a precision 50
>ohm resistor on the other, I measured the following:
>
>Frequency Range for 1.5:1 SWR (50 ohm system):
>
>27735-28990 (28270-28450 was range for 1:1)
>20877-21670
>13820-14546
>6738-7439
>3204-3900
>1.8 Essentially flat over range of interest
>
>        I also measured the following loss using the MFJ:
>
>Freq:           Loss:
>28.3            0.4  (seemed too low!)
>21.2            0.4
>14.15           0.3
>7.075           0.2
>3.535           0.1
>1.768           0.1
>
>        I've used this system over a year in several contests and have
>had no problems.  Just curious to know what people (who said what?) told
>you to watch out for.


73, Pete Smith N4ZR

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