ORIGINAL MESSAGE: On Thu, 10 Jan 2013 18:25:57 -0600, K0RC wrote: >. The 4431 also includes a 'sampling port' which picks off a >variable amount of RF and presents it on the BNC connector. REPLY: I use a standard T-connector in the coax line and tap off the "T" using a capacitor made of twisted insulated wire. Works for me. Bill, W6WRT