I am trying to use an MFJ-1026 "Noise Canceling Signal Enhancer" with my KX3 serial #08668. The MFJ unit has a T/R phone jack for protecting its circuits from RF currents when transmitting.
Q: The voltage seems to be too high according to the Cady book. I need to use the Key Line to signal the MFJ unit to bypass sensitive circuits during transmission. Pg 150 of the Elecraft KX-Line Fred Cady book says the ring has +30 volts on the circuit when open. The MFJ-1026 Manual says to never put over 15v positive to the T/R phone jack? From the MFJ-1026 Manual “T/R Control: We Strongly recommend using this phono connector to switch the MFJ-1026 to the transmit (or bypass) mode. The MFJ-1026 switches out-of-circuit whenever this line is pulled low (below one volt). Never apply negative voltages, or over 15 volts positive, to this jack.” I have the E980232 Cable adaptor with Key Line information on the Ring. I think I could use the phone jack to send the low signal through the Ring. But when it opens up the voltage is too high? Also, am I on the right track here? Other ways to do this? I am not qualified to create my own circuits. can I just run a phone jack from the adaptor plugged into the ACC2 port? Provided I can deal with the +30 volts? I have the KXPA 100 Amplifier and no other amplifiers. This is all I want or need. So the antenna 1 line would run from the KX3 into the MFJ-1026 and then to the 100 watt amplifier. Is this right? Peder Kittelson W7RPK -- View this message in context: http://elecraft.365791.n2.nabble.com/Key-Line-protection-for-MFJ-1026-Noise-Cancelling-Unit-tp7628552.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
