After some encouragement from Eddy VE3CUI I am mobilizing to erect a K9AY loop. Just as soon as the meter of snow that is left in the back forty melts ! The 9:1 Transformer required is recommended to
When you use a ferrite to wind a transformer, you want LOW loss. When you use a ferrite for suppression of RFI, you want HIGH loss. The Fair-Rite catalog is listing this as a suppression part, and 25
It really depends on the specific application. If it is a closely coupled winding, a transmission line transformer, or broadband transformer we generally want a core with an impedance peak around th
I use a pair of large type 43 toroids with 10 turns of RG6 feedline through them for my common mode suppressors on my Beverages. Are you saying this is a poor choice? 73, Richard - K5NA _____________
-- For a common mode suppressor, you simply want enough inductive reactance to impede current flow. The type of core does not matter -- air, low mu or hi mu materials -- as long as the result is at
Having a significant resistive component is useful if the common-mode circuit you're trying to break already has a capacitive reactance... you could make things worse with inductive reactance only.
....unless the common mode impedance is capacitive, which it can be. In that case the choke will increase common mode problems. Also the impedance depends on the core hole length where the wire pass
Not true. The loss component is of far greater use. Consider a suppressor on a wire shorter than a quarter wave. The choke and the line are a series circuit, and the line will be capacitive. An indu
and Be careful of over simplification. Because feedlines can (and often are) several wavelengths long (particularly on the higher bands), you need to specify ranges here. Once the line is longer than
Not in this case -- the +/- reactance conditions in the first half wavelength illustrates the principle. Of course it repeats, and if you read the tutorial you'll see that. But I'm not teaching trans
Not quite. Common mode chokes are most effective when the line is even multiples of 1/2 wave, not 1/4 wave. As a matter of fact if the line is 1/4 wl long and suspended away from ground or large obj