Wall Wart RFI Noise Filter

982840461 - Wall Wart RFI Noise Filter
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HF Base Deluxe Transceiver RFI and Noise Reduction Kit - 14 Filters

RFI-XCVR-DELUXE
$89.95
In stock
1
Product Details
MPN: RFI-XCVR-DELUXE
Type: NEW
Country/Region of Manufacture: United States
Filter Power Rating (PEP watts): 1500
RFI Suppression Range (MHz): 1-300 MHz
# Ferrite Filters: 14
Enclosure Size (inches): n/a
Typical Use:: AC/DC power, RF output, Input/output cables

BUY THIS KIT NOW TO SOLVE YOUR RFI/EMI ISSUES - WORKS WITH MANY BRANDS OF HAM/COMMERCIAL HF RADIOS. Deluxe RFI Filter Kit for HF Radios with multiple antennas, computer interfaces, audio I/O lines.

Kit Includes 4 noise reduction ring filters for multiple antenna coax connectors, AC/DC power and 10 snap

on filters for I/O cables covering RFI range of 1-300 MHz.

Quick installation - immediate RFI/noise reduction. No radio mods required.

Purpose

The RFI kit is designed to be installed on your radio transceiver to reduce Radio Frequency Interference (RFI) caused by common mode current on the outside of the coax braid at the output of your radio and AC/DC power cable. Additional chokes are included to reduce common mode currents on 3 more transceiver cables including computer control, audio and another.

This kit will help reduce or eliminate:

1. “Hot mic” RFI caused by poor grounding of antennas or common mode currents from linear amps feeding unbalanced (coax fed) antennas without baluns/line isolators.

2. RFI to neighbor’s electronic devices including audio/video systems, computers, telephones, garage door openers, etc.

3. RFI to your other radios, audio/video systems, computers, telephones, etc.

A side benefit is a reduction in noise floor in your receiver depending on the amount of noise being introduced by common mode currents (which are blocked/reduced by the chokes in this kit).

These chokes use a special mix of ferrite core material that is effective in suppressing radio frequency interference from transmitters and high noise floor on receivers.

The split beads beads are easy to use, don’t require modification of the protected equipment and work in almost all cases, even when plug-in filters fail.

Use of the chokes often helps cure SWR problems between transceiver and a linear amp and between transceiver and antenna tuner or direct to antenna. The DC power line choke helps keep common mode current out of the power line which could cause interference to other devices connected to the same power line if not suppressed.

Included are the following chokes and installation guidelines:

Kit includes 4 large ferrite rings (1.4" ID) for RF antenna connectors, AC or DC input, large connector cables.

10 snap on (1/2" ID) connectors for computer interface, band switching, rotor control, and other cables.

If you use a linear amplifier buy an amplifier RFI kit for additional RFI interference suppression.
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Wall Wart switching DC power supplies that plug into the AC power line plug and provide DC power to laptops, routers, battery chargers, cell phone chargers, etc are a known source of broadband RFI (a.k.a dirty electricity) that effects many electrical devices including computers, radio receivers, HDTV systems, etc.  In many cases this extra RFI noise effects computer I/O speeds since they have to error correct the information packets many more times due to the noise interference causing packet errors.  A ferrite ring can often increase data throughput by reducing the error correction to normal rates.

A simple ferrite ring filter on the DC power line can help suppress the RFI noise affecting the victim device or keep the DC power cord from acting as an antenna and radiating RFI into other victim devices. This kit is also useful on laptop computer supplies, routers, cable modems, wireless phone charges, etc.

RFI WW Installation 300x288 - Wall Wart RFI Noise Filter

Installation is quick and easy: Just wrap the DC power cord through the center of the ring filter as many times as you can and reinstall.  For best results with long DC power lines, use one at the ring filter at the wall wart end (to prevent the wall wart power supply from using the DC line as an antenna) and another at the DC plug end (to prevent the electronics in the powered device from using the DC power cord as an antenna).  Typical installation is shown below:

The filter suppresses RFI in from .1-100 MHz.   Inside diameter is 3/4 inch/19 mm.

Since most households and office environments have multiple wall warts we offer the Wall Wart RFI Filter kit in bulk quantity packages.

Known RFI Generators include Roku/Sling-TV power adapter - Interference heard in the AM broadcast band
 and harmonics.
Also many ethernet Cable/DSL modems, cell phone chargers, computer power adapters have the same issue:
using the AC or DC side of the power supply as a radiating antenna.

RFI solution is to use a linear power supply, change adapters or wall wart ferrite filters