Hello Chris,
>Apart from
>the over heating (of just the middle core)
The reason is that the voltage drop across L2 is almost twice as high as across
the outer coils,
see attached spice simulation.
The yellow trace represents the voltage across L1,green -> L2, cyan -> L3.
The source votlage has been set such that the dissipated average power in R1 is
2kW.
>When re-wound I can do the test you suggest though, with my AIM4170,
When the VSWR is good,say <1.2,then the overheated core is still ok and the LP
function good as well.
73
Clemens
DL4RAJ
>-----Original Message-----
>From: [email protected]
>[mailto:[email protected]] On Behalf Of Chris Wilson
>Sent: Thursday, May 25, 2017 12:55 PM
>To: Clemens Paul
>Subject: Re: LF: RE: Iron dust toroids and heating
>
>
>
> Hello Clemens,
>25 May 2017
>
>I would have done that straight away but I stripped the burnt wire and
>Kaptan tape off the middle core yesterday ready to rewind it. I made
>a reply a few minutes ago to Stefan re how using the G3YXM LPF didn't
>work at all well on the W1VD amp, even on very low power. Apart from
>the over heating (of just the middle core) on the W1VD LPF filter when
>running more power that I expect it was designed for, it worked fine.
>When re-wound I can do the test you suggest though, with my AIM4170,
>thanks for that
>
>
>
>Best regards,
> Chris 2E0ILY mailto:[email protected]
>
>
>> Hi Chris,
>
>> It no longer
>>>functions as an LPF, and I suspect the T225A-2 toroid is compromised
>>>in its crystalline structure, through the very high
>temperatures, now.
>
>> Can you measure the input VSWR and Z with the filter
>terminated by a 50 Ohm load?
>
>> 73
>> Clemens
>> DL4RAJ
>
>
>--
>Best regards,
> Chris mailto:[email protected]
>
>
>
>---
>Diese E-Mail wurde von AVG auf Viren geprüft.
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>
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