Elecraft K4 Transceiver RFI and Noise Reduction Kit, RFI Range 1-60 MHz, 24 FiltersProduct DetailsMPN: RFI-ELECRAFT-K4Type: NEWCountry/Region of Manufacture: United StatesRFI Suppression Range (MHz): 1-60 MHz# Ferrite Filters: 24Enclosure Size (inches): n/aTypical Use:: AC/DC power, RF output x 4, multiple I/O linesThe Elecraft K4 is an exceptional radio and deserves an exceptional RFI and noise reduction kit which we have designated as the "ELITE" series of Transceiver Kits. This kit is designed to be installed on your radio transceiver to reduce Radio Frequency Interference (RFI) caused by common mode current on the multiple coax connectors of your radio, the AC power input, USB, ethernet, Audio, HDMI, amplifier ALC/Send, mouse, mic and additional interconnect cables. The ELITE Kit has 6 ferrite ring (1.4" ID) filters and 18 ferrite snap on (1/2") filters and instruction manual. Similar kits available for other manufacturers.
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 (MC-1-3000) at the antenna feed point to suppress common current on the coax feed line and a coax noise filter (CMNF-500-50) at the radio end of each coax input to reduce common mode noise.
If you use a linear amplifier use an amplifier RFI kit (RFI-LA-GAC) for additional RFI interference suppression.
MAXI-CHOKER Coax Line Isolator/Balun, 1-61 MHz, 1.5/3KW, SO-239 In/Stud Output, FLAGPOLE OCF, G5RV, ZS6BKW, BN4000 Replacement, Ladder Line-Coax interfaceMAXI-CHOKER Coax Line Isolator/Balun, 1-61 MHz, 1.5/3KW, SO-239 In/Stud Output, FLAGPOLE OCF, G5RV, ZS6BKW, BN4000 Replacement, Ladder Line-Coax interfaceSKU MC-1-1500LL$89.95
The Elecraft K4 is an exceptional radio and deserves an exceptional RFI and noise reduction kit which we have designated as the "ELITE" series of Transceiver Kits. This kit is designed to be installed on your radio transceiver to reduce Radio Frequency Interference (RFI) caused by common mode current on the multiple coax connectors of your radio, the AC power input, USB, ethernet, Audio, HDMI, amplifier ALC/Send, mouse, mic and additional interconnect cables. The ELITE Kit has 6 ferrite ring (1.4" ID) filters and 18 ferrite snap on (1/2") filters and instruction manual. Similar kits available for other manufacturers.
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 (MC-1-3000) at the antenna feed point to suppress common current on the coax feed line and a coax noise filter (CMNF-500-50) at the radio end of each coax input to reduce common mode noise.If you use a linear amplifier use an amplifier RFI kit (RFI-LA-GAC) for additional RFI interference suppression.
Christmas lights or yard lights with switching DC power supplies are often the RFI source and a clamp on ferrite bead on the AC AND the DC side feeding the lights is needed to help suppress the switching power supply RFI noise. Suitable snap on beads are FSB31-1/2 for the 1-250 MHz range.
We have also had reported wireless HDTV boxes, and FOSCAM and AMCREST security camera systems causing RFI to garage door remote openers. Use our Garage Door Opener RFI kit to suppress the interference to the opener (VICTIM) – you need one kit for each opener. Maximize the distance from the camera to the openers may also help. Additionally shield cable to the garage door sensors may be needed depending on severity of the camera RFI.
Obvious Tech Note: make sure your remote batteries have enough energy to activate the GDO or the signal they transmit may not be large enough to over ride the RFI signal, but a fresh battery may be able to overcome the weak RFI source and allow the GDO to operate correctly.