AM Broadcast RFI Kits

Icom IC-9700 Transceiver RFI Kit - 12 Noise Reduction Filters

SKU RFI-ICOM-9700
$79.95
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Icom IC-9700 Transceiver RFI Kit - 12 Noise Reduction Filters
Product Details
MPN: RFI-ICOM-7300
Type: NEW
Country/Region of Manufacture: United States
Filter Power Rating (PEP watts): = Cable Rating
RFI Suppression Range (MHz): 1-300 MHz
# Ferrite Filters: 5
Enclosure Size (inches): n/a
Typical Use:: AC/DC power, RF output, 3 additional I/O lines

BUY THIS KIT NOW TO SOLVE YOUR RFI ISSUES AND REDUCE COMMON MODE RECEIVER NOISE LEVELS FOR YOUR ICOM 9700 VHF/UHF RADIO. ALSO WORKS WITH MANY BRANDS OF HAM/COMMERCIAL HF RADIOS WITH SIMILAR FREQUENCY RANGES.

This kit will help reduce or eliminate:

1. Radio Frequency Interference (RFI) to electronic devices including audio/video systems, computers, telephones, garage door openers, alarm systems, and home appliances, in your house or your neighbor’s house.

2. RFI from other electronic devices such as switching power supplies, LED and fluorescent lights, battery chargers, Ethernet cables, solar systems, kitchen appliances, and cable/satellite TV systems which generate common mode currents on your radio cables.

3. These filters help cure SWR problems between transceiver and a linear amp and between transceiver and antenna tuner or direct to antenna. The DC power line filter helps keep common mode current out of the power line which could cause interference to other devices connected to the same power source.

These chokes use a ferrite core material that is effective in suppressing RFI from transmitters and receivers experiencing a high noise floor in the .15-2000 MHz range. DC filter effective from .15-10 MHz, Snap On filters effective from 1-500 MHz and 200-2000 MHz identified for easy installation on selected antenna and I/O cables.

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

Kit Includes 1 AC/DC noise reduction ring filter and 11 snap on filters for coax and I/O cables. Quick installation - immediate RFI/noise reduction. No radio mods required.

If you use a linear amplifier use a Palomar Engineers amplifier RFI kit for additional RFI interference suppression.


When considering solutions for AM broadcast (550 Khz – 1.8 Mhz) you should consider Mix 77 ferrites available in a variety of shapes and sizes.  Choose a size to give the maximum number of turns of the affected wire or cable.

AM broadcast transmits on a low frequency with large antennas.  Consequently it takes a large antenna to receive the signals.  Typical “antennas” are AC house wiring, phone lines, long satellite or cable TV cables, DSL/CAT5 lines running between rooms, etc.  The device wires that connect to these  “antennas” need to be choked with as many turns through the ferrite as possible.  Some installation examples are shown below on this page.

For AC/ DC power cords and coax cables the F240-77 (2.4″ OD, 1.4″ ID) “Donut” toroid is the most popular.  Also available are smaller toroid donuts and Mix 77 beads. Shown below is a graph with 8, 10, and 12 turns through the toroid – obviously more turns has higher choking impedance.  Mix 77 toroid products are HERE and Mix 77 small beads (for small wires) are HERE

F240 77 Turns Comparison 1024x648 - AM Broadcast RFI Kits

F240-77 Turns Comparison from .1 – 8.1 Mhz

Shown below is a graph of frequency response verses choking magnitude for a F240-77 in the AM Broadcast band for a 12 turn coil around the toroid. (Same info as above but different frequency range).

AM Band Choking Graph F240 77 1024x648 - AM Broadcast RFI Kits

F240-77 Choking Impedance in AM Broadcast Band

 

 

Typical Installations for Donut/Ring Toroids

20131210 114716 150x150 - AM Broadcast RFI Kits

AC Cable on F-240 Toroid – 6 turns

20131210 115137 150x150 - AM Broadcast RFI Kits

Ethernet Cable on F-240 Toroid – 7 turns

20131222 125533 150x150 - AM Broadcast RFI Kits

Audio or Mic cable on F240- 12 turns

 

 Extra Mix 75 Snap On Beads  HERE – VERY effective for AM Broadcast RFI