LADDER LINE - 600 OHM - 18 AWG - 100 FEET

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LADDER LINE - 600 OHM - 18 AWG - 100 FEET:
$107.00

LADDER-LINE -18 AWGOPEN-WIRE BALANCED FEEDLINE 100 FEETCHARACTERISTIC IMPEDANCE – 600 OHMSWIRE TYPE & SIZE – 18 AWG, 19 STRAND, COPPER-CLAD, WITH TOUGH, HIGH DENSITY POLYETHYLENE COATINGWIRE BREAK STRENGTH – 125 POUNDS (EACH WIRE)INSULATOR LENGTH – 3 3/4 INCHESINSULATOR DIAMETER – 1/4 INCH ODINSULATOR SPACING – 12 INCHESINSULATOR MATERIAL – HIGH DENSITY POLYETHYLENE (HDPE) FEEDLINE WEIGHT – 1-¾ POUNDS PER 100 FEETVELOCITY FACTOR – > 0.95NOTE: For those of you who would like HEAVY DUTY, 13 AWG feedline see my other listings. OTHER LENGTHS AVAILABLE – UPON REQUEST, 50 feet 150 feet, 200 feet, etc. My QRZ.com (AL7LW) data is current.THIS TRANSMISSION LINE IS NOT WINDOW-WIRE; IT IS REAL LADDER-LINE.WHY USE OPEN-WIRE TRANSMISSION LINE? When using coaxial cable under high SWR conditions your tuner may provide a 50-ohm load for your radio, but an impedance mismatch and high SWR still exists between the antenna tuner and the antenna! This results in very high losses in the coax. However, at HF frequencies the loss in ladder line is very low, so it doesn’t matter if the SWR on the feedline is extremely high.

Ladder line exhibits much less loss on the HF bands than nearly any other transmission line available. Therefore, a high SWR is of little concern which is especially important when using an antenna for multi-band operation.

Following are examples of power loss for various feedlines and frequencies. Values are for a 100 watt transmitter, 100 feet of feedline and a 10:1 standing wave ratio.Feedline Type Lost power - 3.8 MHz - 28 MHz RG-58 Coaxial Cable 44.6 watts 70.6 wattsRG-8 Coaxial Cable 21.7 watts 43.7 watts14 Gauge Window wire 9.2 watts 23.8 watts

14 Gauge Window wire (wet) 29.4 watts 75 watts

600 Ohm Ladder Line 4.2 watts 10.7 watts

SOME THINGS TO CONSIDER WHEN CHOOSING BALANCED TRANSMISSION LINE:Window-wire has high losses when wet, and it whips around in the wind even when properly twisted.TV type twin-lead has high losses and low power handling capability.TV type ladder-line will not tolerate much wind, especially when cold because the insulators easily break or come loose from the wire.My insulators are not snap-on, wired-on or melted-on as with some other designs. The wires are routed through the insulator and cemented in position so the insulators will not move or break loose.WHY NOT MAKE YOUR OWN BALANCED FEEDLINE?You could shop around for high-quality wire. You could buy or make some type of insulators, perhaps plastic, PVC, ABS, hair curlers, paraffin-soaked wood, plexiglass or whatever. Then, you could spend many hours or days putting it all together. Your completed feedline would probably work okay. However, after all that shopping and work, and a total cost nearly as much as my high-quality feedline, you still won’t be sure your home-brew feedline will survive years of exposure to UV and the weather. My feedline is time-tested here in Alaska with many years of exposure to high winds, rain, snow, ice and temperatures so low I don’t want to talk about it.

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I attempt to describe my items accurately. If you determine that an item description was incorrect and as a result you are dissatisfied with your purchase, you may return the unused item within 30 days and I will refund your purchase price.

Thanks for looking. BUY NOW!

Larry, AL7LW