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
Garage Door Opener RFI Kit, Low Freq (150 KHz-10 MHz) for AM Broadcast or High Freq (1-300 MHz) for Ham Radio or Commercial RFIProduct DetailsBrand: Palomar EngineersUPC: Does Not ApplyMPN: RFI-GDO-LF or RFI-GDO-HFType: NewCountry/Region of Manufacture: United StatesRFI-GDO Garage Door Opener RFI Kit
This RFI-GDO kit is specifically designed to cure most garage door opener systems triggered by Radio Frequency Interference problems. The kit contains ferrite ring toroids (“Donut” shaped ferrites) for the AC power supply protection and “Snap on” ferrite beads for door sensor (2) lines and one manual on/off opener switch.
The ferrites kits are selected to eliminate RFI from in one of two ranges, Either Low Frequency (150 KHZ-10 MHZ) and part# RFI-GDO-LF or High Frequency (1-300 MHZ) with part# RFI-GDO-HF. The ferrites are easy to use, don’t require modification of the protected equipment and work in almost all cases.
What causes RFI?
Strong signals from nearby amateur radio, CB, military, AM/FM and other “transmitters” (such as microwave ovens, cell phones, computers, wireless phones, HDTV systems, home automation systems/light dimmers, variable speed motors, etc) that are picked up by long wires (“antennas”) running through the house electric power wiring or device sensor wires. These “antennas” feed the interfering signals into garage door opener causing it to halt operation or act intermittently.Note: Some of the new Garage door controls use DC motors and a Pulse Width Modulation (PWM) speed controller which can generate RFI into other electronics nearby. Use the RFI kits below to help suppress RECEIVED RFI and RFI TRANSMITTED by your garage door opener.
How to cure RFI
RFI can be stopped by suppressing the signal from the radio “transmitter” or suppressing the signal on the receiving “antenna” feeding the affected device or eliminating the RFI path between the source and victim devices. With the RFI-GDO kit, you run the wires entering the opener through ferrite cores right next to (or inside) the controller box. Ferrites do not affect the signals going through the wires but they resist the passage of common mode RFI keeping the RFI signals out of the opener and stopping the RFI from falsely triggering the opener. Some sensor lines may require multiple ferrite toroids to be most effective. Also the more turns around the toroid, the more effective the RFI filter.
Sometimes you may also have to change frequencies of your GDO to avoid interfering frequencies. Many Chamberland(Whisper Drive, etc)/Craftsman/Liftmaster GDO’s use 280-390 MHz or 315 MHz which may be be close to interfering transmitters. The RFI kit will help to suppress the interference common to all lines including AC and DC driven motors.LED lights or LED light dimmers interfering with Garage door opener: Some brands of LED bulb circuitry operates from 30 – 300 MHz and may cause RFI to the opener. Best bet is to try different LED light brands or remove LED lights from garage and surrounding area. (read: problem is not with the LED lights but the LED circuitry within the LED bulb)Wireless/wired Security Camera Systems can cause RFI - use the RFI-GDO kit to suppress AC induced RFI into the opener.
If the RFI is severe, you may also try placing an aluminum foil “tent” around the sides of the GDO (leaving the “front toward the door open so the antenna can still receive your remote signal).
What is included in the kit?
The RFI-GDO kit is meant to be used with an AC powered (possibly through an AC wall wart or inline dc power supply battery backup) alarm system with up to 3 input/output signal lines and a single power supply line coming into the device. Note: a standard 3 prong AC power plug will go thru the ring ferrite 3-4 times as the ring has an inner ID of 1.4"
TECH NOTE: We also stock RFI kits to protect effected devices such as garage door openers, computers (laptops, desktops), dsl/cable routers, ethernet hubs and many more devices. Remember there is always a “transmitter” and a “receiver” of RFI and the quest is to find and choke the “path” the RFI has selected – you need to add ferrites to both the transmitting side and the receiving side to eliminate RFI problems.
The RFI kits on this page only helps suppress RFI on the receiving side.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. We have also had reported wireless HDTV boxes causing RFI to garage door remote openers.
Snap on ferrites on the power cord supply and/or switching the coax cable interfaces to CAT5 cable may also help solve the problem. 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.
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$89.95On Sale
RG-8X Coax Jumper Cable with PL-259's on each end - 6 feetRG-8X Coax Jumper Cable with PL-259's on each end - 6 feetSKU RG-8X-6List price $19.95 Save 5%$18.95On Sale
HF Linear Amplifier Deluxe RFI Kit - 12 Filters for RF In/Out, AC power, Control Lines - Quadra, PW1, Acom Tokyo High PowerHF Linear Amplifier Deluxe RFI Kit - 12 Filters for RF In/Out, AC power, Control Lines - Quadra, PW1, Acom Tokyo High PowerSKU RFI-LA-DELUXEList price $169.95 Save 24%$129.95
Garage Door Opener RFI Kit, Low Freq (150 KHz-10 MHz) for AM Broadcast or High Freq (1-300 MHz) for Ham Radio or Commercial RFI
Product Details
Brand: Palomar Engineers
UPC: Does Not Apply
MPN: RFI-GDO-LF or RFI-GDO-HF
Type: New
Country/Region of Manufacture: United States
RFI-GDO Garage Door Opener RFI Kit
This RFI-GDO kit is specifically designed to cure most garage door opener systems triggered by Radio Frequency Interference problems. The kit contains ferrite ring toroids (“Donut” shaped ferrites) for the AC power supply protection and “Snap on” ferrite beads for door sensor (2) lines and one manual on/off opener switch.
The ferrites kits are selected to eliminate RFI from in one of two ranges, Either Low Frequency (150 KHZ-10 MHZ) and part# RFI-GDO-LF or High Frequency (1-300 MHZ) with part# RFI-GDO-HF. The ferrites are easy to use, don’t require modification of the protected equipment and work in almost all cases.
What causes RFI?
Strong signals from nearby amateur radio, CB, military, AM/FM and other “transmitters” (such as microwave ovens, cell phones, computers, wireless phones, HDTV systems, home automation systems/light dimmers, variable speed motors, etc) that are picked up by long wires (“antennas”) running through the house electric power wiring or device sensor wires. These “antennas” feed the interfering signals into garage door opener causing it to halt operation or act intermittently.Note: Some of the new Garage door controls use DC motors and a Pulse Width Modulation (PWM) speed controller which can generate RFI into other electronics nearby. Use the RFI kits below to help suppress RECEIVED RFI and RFI TRANSMITTED by your garage door opener.
How to cure RFI
RFI can be stopped by suppressing the signal from the radio “transmitter” or suppressing the signal on the receiving “antenna” feeding the affected device or eliminating the RFI path between the source and victim devices. With the RFI-GDO kit, you run the wires entering the opener through ferrite cores right next to (or inside) the controller box. Ferrites do not affect the signals going through the wires but they resist the passage of common mode RFI keeping the RFI signals out of the opener and stopping the RFI from falsely triggering the opener. Some sensor lines may require multiple ferrite toroids to be most effective. Also the more turns around the toroid, the more effective the RFI filter.
Sometimes you may also have to change frequencies of your GDO to avoid interfering frequencies. Many Chamberland(Whisper Drive, etc)/Craftsman/Liftmaster GDO’s use 280-390 MHz or 315 MHz which may be be close to interfering transmitters. The RFI kit will help to suppress the interference common to all lines including AC and DC driven motors.LED lights or LED light dimmers interfering with Garage door opener: Some brands of LED bulb circuitry operates from 30 – 300 MHz and may cause RFI to the opener. Best bet is to try different LED light brands or remove LED lights from garage and surrounding area. (read: problem is not with the LED lights but the LED circuitry within the LED bulb)Wireless/wired Security Camera Systems can cause RFI - use the RFI-GDO kit to suppress AC induced RFI into the opener.
If the RFI is severe, you may also try placing an aluminum foil “tent” around the sides of the GDO (leaving the “front toward the door open so the antenna can still receive your remote signal).
What is included in the kit?
The RFI-GDO kit is meant to be used with an AC powered (possibly through an AC wall wart or inline dc power supply battery backup) alarm system with up to 3 input/output signal lines and a single power supply line coming into the device. Note: a standard 3 prong AC power plug will go thru the ring ferrite 3-4 times as the ring has an inner ID of 1.4"
TECH NOTE: We also stock RFI kits to protect effected devices such as garage door openers, computers (laptops, desktops), dsl/cable routers, ethernet hubs and many more devices. Remember there is always a “transmitter” and a “receiver” of RFI and the quest is to find and choke the “path” the RFI has selected – you need to add ferrites to both the transmitting side and the receiving side to eliminate RFI problems.
The RFI kits on this page only helps suppress RFI on the receiving side.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. We have also had reported wireless HDTV boxes causing RFI to garage door remote openers.
Snap on ferrites on the power cord supply and/or switching the coax cable interfaces to CAT5 cable may also help solve the problem. 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.
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 interface
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 interface
SKU MC-1-1500LL
$89.95
On Sale
RG-8X Coax Jumper Cable with PL-259's on each end - 6 feet
RG-8X Coax Jumper Cable with PL-259's on each end - 6 feet
SKU RG-8X-6
List price $19.95
Save 5%
$18.95
On Sale
HF Linear Amplifier Deluxe RFI Kit - 12 Filters for RF In/Out, AC power, Control Lines - Quadra, PW1, Acom Tokyo High Power
HF Linear Amplifier Deluxe RFI Kit - 12 Filters for RF In/Out, AC power, Control Lines - Quadra, PW1, Acom Tokyo High Power
SKU RFI-LA-DELUXE
List price $169.95
Save 24%
$129.95