I suggest a different solution. Rebuild the serial cable using the techniques detailed in Chapter 8 of my RFI tutorial.
http://audiosystemsgroup.com/RFI-Ham.pdf Also, the coupling mechanism for the noise is very likely a "pin 1 problem," also discussed in that tutorial. The ONLY good termination for a cable shield is the shielding enclosure (the chassis) of the equipment on each end. When you tie the shield to the "audio ground" or "control ground" or "signal ground," it allows the cable shield to radiate RF trash from the equipment, and it also allows the cable shield to RECEIVE RF from your transmitting antenna (also known as RF feedback, or "RF in the shack"). 73, Jim Brown K9YC _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
