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
Alinco DX-77 Transceiver RFI Kit - 4 Noise Reduction FiltersProduct DetailsMPN: RFI-ICOM-7300Type: NEWCountry/Region of Manufacture: United StatesFilter Power Rating (PEP watts): = Cable RatingRFI Suppression Range (MHz): 1-300 MHz# Ferrite Filters: 5Enclosure Size (inches): n/aTypical Use:: AC/DC power, RF output, 3 additional I/O linesBUY THIS KIT NOW TO SOLVE YOUR RFI PROBLEMS! WORKS WITH MANY BRANDS OF HAM/COMMERCIAL HF RADIOS INCLUDING ALINCO DX-77 and similar radios.
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 1-300 MHz range.
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 2 noise reduction ring filters for coax and AC/DC power and 2 snap on filters for I/O cables. Quick installation - immediate RFI/noise reduction. No radio mods required. Snap on ferrites may be either 4 or 6 sided depending on inventory - they have identical electrical properties..
For additional RFI suppression, use a feed line choke at the antenna feed point to suppress common current on the coax feed line during TRANSMIT and a CMNF-500-50 coax noise filter at the radio end of the coax to reduce common mode noise during RECEIVE.
If you use a linear amplifier use a Palomar Engineers amplifier RFI kit for additional RFI interference suppression.
We stock RFI/Noise Reduction kits for most brands of radio transceivers and generic kits for others
Visit our website for all your RFI/noise reduction needs!
On Sale
Laptop Computer with DC power RFI Kit - 7 FiltersLaptop Computer with DC power RFI Kit - 7 FiltersSKU RFI-LaptopList price $34.95 Save 14%$29.95On Sale
Desktop Computer with AC power RFI Kit - 7 FiltersDesktop Computer with AC power RFI Kit - 7 FiltersSKU RFI-DesktopList price $39.95 Save 25%$29.95On Sale
RG-8X Coax Jumper Cable with PL-259's on each end - 3 feetRG-8X Coax Jumper Cable with PL-259's on each end - 3 feetSKU RG-8X-3List price $19.95 Save 15%$16.95On Sale
Generic Computer Equipment/Ethernet RFI Kit - 10 FiltersGeneric Computer Equipment/Ethernet RFI Kit - 10 FiltersSKU RFI-COMPUTERList price $59.95 Save 17%$49.95
BUY THIS KIT NOW TO SOLVE YOUR RFI PROBLEMS! WORKS WITH MANY BRANDS OF HAM/COMMERCIAL HF RADIOS INCLUDING ALINCO DX-77 and similar radios.
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 1-300 MHz range.
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 2 noise reduction ring filters for coax and AC/DC power and 2 snap on filters for I/O cables. Quick installation - immediate RFI/noise reduction. No radio mods required. Snap on ferrites may be either 4 or 6 sided depending on inventory - they have identical electrical properties..
For additional RFI suppression, use a feed line choke at the antenna feed point to suppress common current on the coax feed line during TRANSMIT and a CMNF-500-50 coax noise filter at the radio end of the coax to reduce common mode noise during RECEIVE.
If you use a linear amplifier use a Palomar Engineers amplifier RFI kit for additional RFI interference suppression.
We stock RFI/Noise Reduction kits for most brands of radio transceivers and generic kits for others
Visit our website for all your RFI/noise reduction needs!
