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
Power Pole DC Power Cord RFI/Noise Filter - up to 30dB Noise Reduction, 45 Amp ConnectorsProduct DetailsMPN: PPNF-3Country/Region of Manufacture: USASimple DC Power Cord Noise Filter Choke with Power Pole Plugs
The simplest, most cost effective DC power cord noise filter is a ferrite ring installed as shown in the picture (at the radio/device DC input) to stop DC feedback radiation back into the DC power line or into the radio/appliance to suppress common mode power line noise current on the DC power cord or to suppress common mode noise present on the power lines from degrading the performance of the attached device.
These chokes are cheap, easy solution for RFI issues. Just replace your existing power cord with these prewound cables and enjoy interference free operation.
Simple DC Power Cord Noise Filter Choke with Power Pole Plugs
The simplest, most cost effective DC power cord noise filter is a ferrite ring installed as shown in the picture (at the radio/device DC input) to stop DC feedback radiation back into the DC power line or into the radio/appliance to suppress common mode power line noise current on the DC power cord or to suppress common mode noise present on the power lines from degrading the performance of the attached device.
These chokes are cheap, easy solution for RFI issues. Just replace your existing power cord with these prewound cables and enjoy interference free operation.
