Re: [IC-7000] Re: IC700 and PRO7 IC headset RFI on my rig

Colin Christie

Tried a choke  at the antenna , still the problems exists. Going to move the AH4 atu outside to see if that is the problem.

On Fri, 25 Nov, 2016 at 3:41, Charles Scott cscott@... [ic7000]


That's certainly the primary way those currents end up on the transmission line and into your shack, and for some antennas a "common-mode" choke or balun is a requirement or your transmission line becomes part of your antenna.

Near-field coupling to transmission lines, interconnection cables, power, etc are also a possibility. If the antenna is close to the house, or the transmission line at any point is in an orientation that can result in power being coupled onto it, other things may need to be done to suppress the problem.

Chuck - N8DNX

On 11/24/2016 4:01 AM, Graham Shaw muzzo@... [ic7000] wrote:
Hi - put your coax choke at the antenna as this is how to remove common mode currents traveling on the outside of the coax and back into your shack.

73 de Graham

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