So why are x uH's of green wire inductance ok in the three wire case and
not for a single green wire (engineering pls, not UL regs)?
Grant KZ1W
On 5/20/2014 6:48 PM, Jim Brown wrote:
On 5/20/2014 8:23 AM, Grant Saviers wrote:
Advice?
Honda generators put out trash as a common mode signal on the green
wire. It is NOT acceptable to choke the green wire, but it IS
acceptable to choke all three conductors. Thus, the solution is
winding turns through #31 or #43 cores, following the winding advice
in my Choke Cookbook for RG8-size cables. We use Honda 2000i
generators on FD and California QSO Party county expeditions, and
these filters work.
Conventional power line filters do NOT suppress this noise, because
the green wire goes straight through them. Yes, they do spec "common
mode rejection," but their definition of common mode is the voltage
between neutral and green, which is not common mode from an RF point
of view.
73, Jim K9YC
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