Home |
Search |
Today's Posts |
#1
|
|||
|
|||
antenna rotator cause hum in receiver
I have a Ham IV that when I turn on the brake the receive signal takes on a 60 or 120 hz hum . I though it might be the control box too close to my Icom 746 PRO. I have a switch box connecting two lowband wire antennas and a triband beam to the Icom. If I listen to a signal on the wire antennas I do not get the hum modulation on the incomming signal when I rotate the beam. Those coax wires are not near the rotator wires. This tends to eliminate the transfromer of the rotator box from getting into the Icom by magnetic coupling. If I switch to the beam , then turn the brake on the rotator box I will get hum modulation. The triband is fed with some Davis Bury flex (foil and braid shield coax) and the rotator wires are taped to the coax for a distnce of about 100 feet. The antenna does not have to ratate, just mashing the brake release button will make the signal hum modulate on receive. The Icom is being powered by an Astrom 50 amp supply and the rotator plugs into the 120 vac outlet. |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
hum in receiver from rotator | Antenna | |||
FA: New in the box CDR AR-40 antenna rotator | General | |||
FA: New in the Box CDR antenna rotator AR-40 | Equipment | |||
Antenna Rotator problem | Antenna | |||
Rotor with control box, antenna Rotator | Scanner |