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
RFI Kit for Electric Fuel Pump Interference (4 filter set)Product DetailsMany older cars/trucks have a fuel pump in the gas/diesel tank that emits RFI through the external gauge connections. The simplest solution is multiple ferrite beads on the fuel pump connection wires outside of the fuel pump. You may need to lift the car/truck to gain access to these wires. Use two FSB31-1/2 snap on beads on each wire (usually 2 or 3 wires depending on make/model). Works on boat fuel pumps also.
Many older cars/trucks have a fuel pump in the gas/diesel tank that emits RFI through the external gauge connections. The simplest solution is multiple ferrite beads on the fuel pump connection wires outside of the fuel pump. You may need to lift the car/truck to gain access to these wires. Use two FSB31-1/2 snap on beads on each wire (usually 2 or 3 wires depending on make/model). Works on boat fuel pumps also.