1500 Watt Rated 1.5:1 CUBE™ Unun
Purpose. The CU-1.5-1500 (1500 watts PEP) or CU-1.5-5000 (5KW PEP) is used as a 1:1 unun(aka feed line choke, line isolator) for 50 ohm unbalanced coax cable input to 75 ohm unbalanced coax output at full amateur radio legal power (1500/5000-watts PEP) into a matched load 50 ohm load for 1.8-61 MHz (or a balanced output load for the CB-1.5-1500/5000). The unun (or balun) is designed to have a high RF impedance to common mode currents on the outside of the coax braid while passing RF currents on the inside of the coax braid to the antenna.
For maximum common mode current protection (and receiver noise floor reduction due to common mode current pickup by the coaxial braid), use one feed line choke such as the CU-1-1500 (for 50 ohms coax) or CU-1.5-1500/5000 (for 75 ohm coax) at the antenna and another at the radio shack equipment connection or input of antenna tuner.In some difficult RFI cases, additional common mode chokes are needed between equipment such as linear amps and antenna tuners, and transceivers.
This Unun or Balun designed to work with 75 ohm loads and the Unun/Balun will be damaged if you use at high impedances and high power such as driving a 40 meter antenna with an 80 meter transmitter signal where the load impedance on the antenna is very high.Best use is with antennas having a load impedance near 75 ohm range.
Generator RFI testimonial:
Bob Received your order in a timely fashion. Tried the generator kit on Sunday & it drops the noise from S9 to S5 and took out all the electrical noise. I may want some more toroids from you at some point for other interference problems I have here. Ken VE3KCY
Using an amplifier? Don’t forget our Linear Amplifier RFI Kits
Want to make up your own RFI kits for a particular operation? Here are links to some of typical RFI solutions used in portable operations:
If you use a computer for logging in your portable operations, RFI getting into computers will often lock up your computer and/or radio and a computer RFI suppression kits may be helpful
Make your expedition or portable operation a pleasant and fun outing and remember to take along your RFI kits so you have more time to operate rather then to troubleshoot intermittent or noisy receiver conditions.
Portable Antenna Kits
If you need an effective portable antenna which folds up for transport yet is easy to deploy at your operating site, consider the BULLET series of end fed wire antennas.
BULLET Antennas (click on link or picture for more info)
