5:1 CUBE™ Unun – Model CU-5-1500 (50:250 Ohm, 1.8-61 MHz, 1.5KW PEP)
Application. For traveling wave, end fed or portable 20-31 foot vertical antennas the 5:1 unun makes a good transformer for converting 50 ohm coax to a 250 ohm feed point. If you use the antenna on multiple bands, the feed point impedance may not always be 250 ohms and use of the unun at high (>350 ohms) or low (<100 ohms) will require reduced power input or the unun may have its power ratings exceeded and damage to the unun may occur. The (5:1 conversion ratio will change for loads other than 250 ohms unbalanced.
Typical application:
Also available as a balanced output – CB-5-1500
HF Transceiver RFI/Noise Reduction Kit, RFI Range 1-300 MHz, 5 FiltersProduct DetailsMPN: RFI-XCVR-STDType: NEWCountry/Region of Manufacture: United StatesFilter Power Rating (PEP watts): 1500RFI Suppression Range (MHz): 1-300 MHz# Ferrite Filters: 5Enclosure Size (inches): n/aTypical Use:: AC/DC power, RF output, 3 I/O linesBUY THIS KIT NOW TO SOLVE YOUR RFI/EMI NEEDS! WORKS WITH MANY BRANDS OF HAM/COMMERCIAL HF RADIOS
Standard 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.
Use With all brands including:
Icom: IC-706, 718, 746. 756, 7100, 7200, 7300, 7400
Kenwood: TS-480
Yaesu: FT-450, 817/818, 857, 891, 897, 950, 991A, 1200
If you have a high end radio with multiple antennas, and more than 3 I/O cables, use our Deluxe Transceiver RFI Kit, RFI-XCVR-DELUXE
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 snap on 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 AC/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:
RF Input/Output: 1.4" ID ring filter – 5-9 turns of RG-58/RG-8X size coax cable through center
AC/DC Input: 1.4" ID ring filter – 3-7 turns of AC/DC power cable through center
3 additional I/O cables - 1/2" snap on with 1-2 turns through center. Multiple wires can share the same filter.
For additional RFI suppression, use a feed line choke at the antenna feed point to suppress common current on the coax feed line.
If you use a linear amplifier use an amplifier RFI kit for additional RFI interference suppression.
BUY THIS KIT NOW TO SOLVE YOUR RFI/EMI NEEDS! WORKS WITH MANY BRANDS OF HAM/COMMERCIAL HF RADIOS
Standard 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.
Use With all brands including:
Icom: IC-706, 718, 746. 756, 7100, 7200, 7300, 7400
Kenwood: TS-480
Yaesu: FT-450, 817/818, 857, 891, 897, 950, 991A, 1200
If you have a high end radio with multiple antennas, and more than 3 I/O cables, use our Deluxe Transceiver RFI Kit, RFI-XCVR-DELUXE
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 snap on 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 AC/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:
RF Input/Output: 1.4" ID ring filter – 5-9 turns of RG-58/RG-8X size coax cable through center
AC/DC Input: 1.4" ID ring filter – 3-7 turns of AC/DC power cable through center
3 additional I/O cables - 1/2" snap on with 1-2 turns through center. Multiple wires can share the same filter.
If you use a linear amplifier use an amplifier RFI kit for additional RFI interference suppression.
