On 7/27/2013 7:43 PM, Rick - DJ0IP / NJ0IP wrote:
Both transformers have their windings wound over the pair of stacked
toroids. This is bad....It only works as a 4:1 transformer,
A better 4:1 balun is the Balun Designs 4115ocf.
View the picture of the insides of this Balun and see how the cores are
wrapped differently from the 4125.
In this case, each transformer has its own dedicated core, independent of
the other. THIS ONE WORKS.
____________________________________________________
Given the problems winding everything on
a single core - and recognizing using two
toroids as a single core is STILL USING
just ONE CORE...
Would one be be better off having two separate
devices, i.e., one to act as a 4:1 impedance
transformer and another to act as a common
mode choke?
If so, might we go one step further and suggest
it is better to just wind them separately and
maybe even put a little space between them to
minimize stray capacitance, inductance, etc?
Maybe put them in different NEMA boxes, even?
It seems that would give each device more "room"
to do its separate job independently of the other
one. If that is the case, the only down side
would be the additional cost of another or a
larger NEMA box, and maybe a couple extra
connectors.
Any traction?
=================== K8JHR ===================
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