RadioShack 270-055 20 Amp Heavy Duty Automotive Electrical Noise Filter

Description

Automotive Noise Filter
Install this 12-volt filter to reduce interference in car stereos, equalizers, boosters, radios, CB sets and ham rigs.
This 20-Amp Heavy-Duty Noise Filter is for use with high-power automotive entertainment and communications equipment. Its superb design gives you maximum filtering efficiency at low to intermediate power, as well as providing good filtering at very high power levels.
This noise filter can handle up to 20 amps, or over 200 watts.
Many noise problems are the result of poor ground connections. Check all the ground connections in your system. If you must replace a ground wire, be sure to use a wire at least as big as the wire you replace.
If you still hear noise, disconnect your system's antenna lead. If you still hear the noise, this filter should help. If the noise disappeared when you disconnected the antenna, this filter will not solve your problem. This means that your system is picking up noise through the antenna, and you must correct the problem at its source, Resistor plugs, noise-suppressor ignition wires, a distributor resistive filter, and motor feed-through capacitors also reduce noise and are available at most auto parts stores.
Installation
CAUTION: Although this product is designed to be installed by the do-it-yourselfer, incorrect hookup could result in damage to your vehicle's electrical system and/or the filter. If you have any doubts, refer installation to a qualified professional.
1. Disconnect your vehicle's positive battery cable.
2. Mount your filter under the dash using self-tapping screws (not included). If you must drill pilot holes, do not drill into air ducts, electrical assemblies, or mechanical assemblies behind the surface.
3. Disconnect your system's power cables. Connect your filter's blue lead to your system's main positive power lead (usually red with an inline fuse). If you have more than one component (for example: tuner, amplifier, graphic equalizer) you can connect all of the component's power leads to the filter, so long as their combined current draw is less than 20 amps.
4. Connect your filter's red lead to your vehicle's positive power lead (from battery or fuse block). Then, connect the black lead to a good vehicle ground, such as the engine block or vehicle frame.
5. Check all connections. Then, reconnect your vehicle's positive battery cable.
To fully protect your filter, connect the red lead through a 20-amp fuse.
(not included, sold separately)
Specifications
Maximum Voltage:
16VDC
Maximum Current:
20 Amps
Voltage Drop at 20 Amps:
0.6VDC max
Attenuation:
1000 Hz, 35dB +/- 10%
Attenuation:
4000 Hz, 45dB +/- 10%
Notes
The retail package was in poor condition, was thrown out and will not be shipped. Refer to the installation instructions above.
The 2 sheet metal mounting screws are missing and will not be shipped. Search through your junk drawer for suitable substitutes.
The 3 wires have anomalies and idiosyncrasies such as a fraction of an inch of insulation has been removed, solder is on the wire ends, the wire length is shorter than originaly manufactured or a lug has been cut off, etc. You can still somehow solder or crimp the wires for a successful installation.
There are minor scuffs, scratches and scrapes.
These filters are discontinued and hard to find.
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► Item Condition: New in factory sealed package.
► Package Condition: Minor shelf wear.
► Warranty: 30 Days
► RadioShack Cat. No. 270-055
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