1.5:1 Baluns/Ununs

Icom 703/705/706/718/7000/7100 Transceiver RFI Kit - 5 Noise Reduction Filters

SKU RFI-Icom-7000
$39.95
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Icom 703/705/706/718/7000/7100 Transceiver RFI Kit - 5 Noise Reduction Filters
Product Details
MPN: RFI-ICOM-7000
Type: NEW
Country/Region of Manufacture: United States
Filter Power Rating (PEP watts): 1500
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/EMI NEEDS! WORKS WITH MANY BRANDS OF HAM/COMMERCIAL HF RADIOS INCLUDING THE ICOM 703/705/706/718/7000/7100

Kit Includes noise reduction ring filters for coax, AC/DC power and 3 snap on filters for I/O cables covering RFI range of 1-300 MHz. Quick installation - immediate RFI/noise reduction. No radio mods required. Includes snap on filters for separation kit cable


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.

For additional RFI suppression, use a feed line choke at the antenna feed point to suppress common current on the coax feed line and a CMNF-500-50 coax noise filter at the radio end of the coax to reduce common mode noise.


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

50 ohm coax to 75 ohm balanced output baluns are useful for low (< 1 wavelength) dipoles exhibiting 75 ohm characteristic impedance or for matching to balanced ladder line whose endpoint impedance is near 75 ohms.

50 ohm coax to 75 ohm CATV coax connections are easily done with a 1.5:1 unun with SO-239 connectors on input and output.  Likewise 50 ohm coax to unbalanced verticals or loads near 75 ohms can be matched with a 1.5:1 unun.