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
>-----Original Message-----
>From: [email protected]
>[mailto:[email protected]] On Behalf Of Chris Wilson
>Sent: Wednesday, May 24, 2017 4:47 PM
>To: [email protected]
>Subject: LF: Iron dust toroids and heating
>
>Hello LF'ers,
>
>24 May 2017
>
>
>If I run the combiner on my 2 amps the LPF centre toroid heats up. I
>made a silly mistake with setting my U3S driver the other night and
>instead of TX'ing every 30 minutes it went on an every two minute
>rampage before it soon self halted. The centre toroid winding has lost
>most of its enamel coating and the Kaptan tape is crispy. 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.
>115uH seems to be the calculated figure, if not actually measured (73
>turns 14 AWG enamelled wire) of the centre inductor. An air core coil
>of similar inductance isn't THAT big, (at least not the size of a
>"small car" as someone on a US forum estimated :)) Is an air cored LPF
>viable, or do i need to look at different core sizes or materials?
>Thanks. LPF is at:
>
>
>http://www.w1vd.com/LPF.html
>
>Thanks.
>
>
>
>--
>Best regards,
> Chris mailto:[email protected]
>
>
>
>---
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