[TowerTalk] [Bulk] Cutting a FT-240 type 33...in half

[Roger (K8RI) on TT]

Sounds more like you inductively coupled the RF to the cores using them 
as a load, rather than as an in line chole

73

Roger (K8RI)


On 2/10/2015 5:36 PM, Steve Hunt wrote:
> Jim,
>
> That is such a revolutionary statement that I felt I must investigate 
> it. So I loosely wound 4 turns of PTFE wire on a Type 43 toroid - the 
> wire was barely touching the toroid. The impedance measured around 200 
> Ohms at 10MHz - almost entirely resistive. I connected it across my 
> tuner, adjusted for a good match, and then applied 20W at 10MHz for 5 
> minutes.
>
> At the end of 5 minutes I touched the wire and then the toroid. The 
> wire was barely warm, but I scolded my finger on the toroid!
>
> There's no doubt at all that the dissipation mechanism is within the 
> ferrite toroid, not the wire; if the wire gets hot it's because it's 
> in contact with the toroid.
>
> Or perhaps I completely misunderstood what you are claiming?
>
> Steve G3TXQ
>
>
>
> On 10/02/2015 21:18, Jim Brown wrote:
>> There is dissipation in a ferrite core choke in the resistance 
>> coupled from the ferrite core. It is the coax shield that gets hot, 
>> not the ferrite (although the heat in the coax may be transferred to 
>> the ferrite material).


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