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300-ohm ladder line is a type of balanced transmission line often used in amateur radio, television antennas, and some professional RF applications. Below are the typical specifications, power handling, and other details:

Specifications

  1. Impedance:
    • 300 ohms (nominal, balanced).
  2. Material:
    • The conductors are typically made of copper or copper-clad steel.
    • The insulators are generally made of polyethylene or similar materials.
  3. Spacing:
    • The two conductors are held apart by a uniform dielectric spacing, maintaining the 300-ohm impedance.
  4. Loss Characteristics:
    • Lower loss than coaxial cable over similar distances, especially at higher frequencies.
    • Loss depends on the quality of the material, frequency, and length.

Power Handling

  1. Power Ratings:
    • 300-ohm ladder line can typically handle hundreds of watts of RF power.
    • High-quality ladder line can handle up to 1,000 watts or more, depending on the spacing and insulation material.
  2. Factors Influencing Power Handling:
    • Dielectric Breakdown: The insulation must resist high voltages caused by high RF power.
    • Heating: Larger conductor sizes allow for greater current capacity and less heating.

Advantages

  • Low Loss: Ladder line has significantly lower loss than coaxial cable, especially at high frequencies, because of its open-air dielectric and balanced design.
  • Flexibility: It can be used for long runs with minimal signal degradation.
  • Wide Matching Range: Ideal for use with antenna tuners, allowing operation across a wide range of frequencies.

Disadvantages

  • Vulnerability to Noise: The open structure makes it more susceptible to noise and interference compared to coax.
  • Installation Challenges: It requires careful installation to avoid proximity to metallic surfaces, which can affect its impedance and efficiency.

Applications

  1. Feeding multi-band dipole or Yagi antennas.
  2. Use in amateur radio for high-efficiency transmission.
  3. Broadcasting and TV antenna systems.

If you need detailed specifications for a particular manufacturer or application, let me know!
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LL30018 OHM Ladder Line LL30018 OHM Ladder Line LL30018 OHM Ladder Line
300 OHM - 18/19 AWG 50 FT.
Our price: $25.85

(3)
300 OHM - 18/19 AWG 75 FT.
Our price: $38.85

(1)
300 OHM 18/19 AWG "Sold By The Foot" Just enter the total number of feet needed in the Qty Box 300 ohm, #18, 19 strand copper clad steel ladder line, PE jacket 300 ohm, #18, 19 strand copper clad steel ladder line, PE jacket
LL30018 OHM Ladder Line LL30018 OHM Ladder Line LL30018 OHM Ladder Line
300 OHM - 18/19 AWG 100 FT.
Our price: $51.85
Sale Price: $49.85
Savings: $2.00

(2)
300 OHM - 18/19 AWG 125 FT.
Our price: $63.85

(2)
300 OHM - 18/19 AWG 150 FT.
Our price: $76.85
Sale Price: $73.85
Savings: $3.00

(3)
300 ohm, #18, 19 strand copper clad steel ladder line, PE jacket 300 ohm, #18, 19 strand copper clad steel ladder line, PE jacket 300 ohm, #18, 19 strand copper clad steel ladder line, PE jacket
LL30018 OHM Ladder Line LL30018 OHM Ladder Line LL30018 OHM Ladder Line
300 OHM - 18/19 AWG 175 FT.
Our price: $89.85

(1)
300 OHM - 18/19 AWG 250 FT.
Our price: $127.85
Sale Price: $123.85
Savings: $4.00
300 ohm, #18, 19 strand copper clad steel ladder line, PE jacket 300 ohm, #18, 19 strand copper clad steel ladder line, PE jacket 300 ohm, #18, 19 strand copper clad steel ladder line, PE jacket