[TowerTalk] Power line filter question

[Grant Saviers]

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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