Well, there is only one way to find out. I'll see if I can find one of my
bifilar wound coils and connect a signal generator to the base and put a
capacitor in line with one of the legs. I think I only have flat spiral
secondaries wound as bifilar at the moment. If I have to, I'll wind a
cylinder but that might be a few weeks.
On Fri, Mar 21, 2014 at 7:58 AM, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:
> On 3/20/14 7:36 AM, David Thomson wrote:
>
>> On Thu, Mar 20, 2014 at 7:22 AM, t-burns14 <t-burns14@xxxxxxxxxxx> wrote:
>>
>> Have any of you wound bifilar coils? What is the difference in
>>> performance?
>>>
>>>
>> Bifilar coils effectively increase the wire diameter by two. The
>> difference
>> is a higher current, lower potential output at the top load. The streamers
>> are brighter, thicker, and snappier.
>>
>> Now that I think about it, It also seems to add an extra dimension to the
>> resonance in the secondary. Instead of having a single conductor in
>> resonance, there are now two conductors in resonance.
>>
>
> I don't think so. at least not at TC frequencies.
>
>
>
>> I haven't tried it on my bifilar and trifilar coils, but it seems that
>> putting a capacitor in line with one of the wires could have a unique
>> effect. For example, causing the second wire to be 90 degrees or 180
>> degrees out of phase with the first would probably change the streamer
>> pattern in an unusual way.
>>
>
> The two wires are so tightly coupled by their magnetic and electrical
> fields, I don't know that the capacitor would have a big effect.
>
> Maybe at VHF kinds of frequencies, there might be an effect. Hmm, a way
> to reduce RFI?
>
>
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