In addition to the Cable Calculator Guide results, also read
the examples listed below. You need to consider that there may be some
variations to your antenna system(s) and it would be unworkable for our
guide to address all those systems.
- Example 1:
- If you’re operating a 10, 15, & 20 meter tri-bander or multi-band
vertical antenna system with a high watt amplifier, and your "run"
is around 50ft-250ft, then RG213/U is typically the appropriate cable
to use. Because typically these antennas work consistently well with
a 50 Ohm cable using a solid Polyethylene Dielectric rated at 66% Velocity
of Propagation. Similarly, Solid Polyethylene Dielectrics tend to maintain
their electrical integrity over a longer time period, even at constant
- Example 2:
- If you’re operating a multi-band vertical antenna or a dipole
antenna system below 30MHz and without an amplifier, and your "run"
is from 100ft to 300ft, then RG8/U with a foam Polyethylene Dielectric
is typically the appropriate cable to use. This Dielectric is rated
78% Velocity of Propagation. In this case, since there is no amplifier,
the foam Dielectric will not be adversely affected. Yet, you enjoy slightly
- Example 3:
- If you’re operating 2 meter &/or 440 antenna systems, the
lower attenuation 50 Ohm coax cables are definitely appropriate to use
here, regardless of the cable "run". These cables are 9913
flexible, The Times Microwave LMR® series, and/or Andrew Heliax®.
They operate with a Velocity of Propagation of 84% or higher and all
have either a double or corrugated shields. Since the higher frequencies
have greater losses, and require greater shielding, these cables offer
the best overall performance characteristics.
For additional guidance use our Attenuation
& Power Rating Coax Chart. The Times Microwave LMR® series
and the Andrew Heliax® are both listed separately.
In closing, it is essential that connectors are properly terminated,
installed and that your antenna is resonant. Otherwise, the cable(s) may
not perform as specified.
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