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Coax Cable & Selectors
Coaxial cable (coax) is designed to transfer your radio transmitter's energy
to your antenna with as little loss as possible. It is precisely made, with the
correct impedance for VHF installations.
We offer three kinds of 50 ohm coax cable for VHF radio installations: RG-
58CU, RG-8X, and RG-213, the mil-spec replacement for RG-8U. Use the
largest coax you can fit to reduce signal loss. Here is the reason: Almost all
VHF radios start with about 25 watts of transmit power. As soon as the signal
starts down the coax cable, it begins to lose strength. This loss is measured
in dB. High gain antennas cannot recover this lost energy, but they can focus
the remaining energy across the water so you come through with as much
punch as possible.
Bigger coax reduces signal losses between the radio and the antenna, which
increases power at the antenna. This chart shows the effect of using different
sizes of coax:
Coax Size vs. Signal Loss
Cable 20' 40' 60' 80' 100'
RG-58CU -1.2dB -2.4dB -3.6dB -4.9dB -6.1dB
RG-8X -0.9dB -1.8dB -2.7dB -3.6dB -4.5dB
RG-213 -0.5dB -1.0dB -1.6dB -2.1dB -2.7dB
We strongly recommend that you use Ancor coax cable unless your antenna
is supplied with cable. Ancor cable has a very tightly woven shield braid and
uses tinned wire for greater corrosion resistance.
One of the most common ways to negatively impact your radio's performance
is with a poor splice to your antenna cable. Splices made without the correct
connectors can reduce your transmit power by a factor of ten or more. When
it is necessary to splice a coax cable, like at the base of a mast, use PL-259
connectors and a PL-258 double female connector. This method will reduce
losses compared to simply soldering or crimping the conductors together.
One drawback of connectors is that they can allow water to get into the cable.
Water tends to "wick" inside the braided shield on the cable, which quickly
corrodes the copper into a green crust. You must protect all coax connec-
tions from water intrusion, especially in the bilge area, masthead, or where
exposed to water.
For connections that are open to the elements, we recommend Ancor heat
shrink tubing, after coating the connection with silicone grease. Many turns of
waterproof tape is an acceptable, but less desirable, alternative.
Radio Antenna Tester
No need to call for a radio check when you have
this compact, easy to use, unit. Unlike other meters
in its class, the ART-3 tests receiver function as well
as output power and VSWR (antenna efficiency).
Powered by an internal battery or ship's 12V DC
with included power cable. Check battery level at
the flip of a switch.
SHAKE# ART-3 ShWt .4
Two-Way Antenna Selector
Innovative switch automatically toggles between
two radios and one antenna when you key one of
the microphones. The radio stays locked onto the
antenna until the auto switch detects a transmit
signal from the other radio. Cast aluminum case
mounts out of the way. Uses SO-239 connections.
Frequency range: up to 600MHz. Power rating:
30W. Draw: 200mA. Sensing/switching time: less
SHAKE# AS-2 ShWt .8
RG-8X VHF Coax
RG-59U TV Coax
RG-213 VHF Coax
RG-58CU VHF Coax
Marine-Grade Coax Cable
Premium-quality cable has 96% braid for best signal strength and least
interference. Tinned copper wire is used for the conductor and shield, insulated
by a UV-inhibited white jacket. Use RG-58CU for interconnecting electronic
equipment, RG-59U for TVs and some SAT NAVs, RG-8X for VHF runs less than
50' and RG-213 for VHF runs over 50'. The chart shows the effect on 50MHz
signal loss of different sizes of coax. Price is per foot.
Cable Nominal OD AWG Ohms
ANCOR # ShWt
RG-58CU 3/16" (4.8mm) 20 50 3.3 49'
RG-8X 1/4" (6.4mm) 16 50 2.5 66'
RG-59U 1/4" (6.4mm) 23 75 2.4 88'
RG-213 13/32" (10.3mm) 13 52 1.3 111'
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