[TowerTalk] RG402 for Choke/Balun

[Máximo EA1DDO_HK1H]

<http://foro.ea1ddo.es/>

Jim, I appreciatted your point of view.

Do you think RG402 is good to build chokes at HF on FT240's ?

Thank you

73, Maximo

________________________________
De: TowerTalk <towertalk-bounces at contesting.com> en nombre de Lux, Jim <jim at luxfamily.com>
Enviado: jueves, 18 de marzo de 2021 14:01
Para: towertalk at contesting.com <towertalk at contesting.com>
Asunto: Re: [TowerTalk] RG402 for Choke/Balun

On 3/18/21 6:07 AM, john at kk9a.com wrote:
> I have no experience with RG402.  It appears to be a little smaller
> and it has a steel conductor.  What RF properties are better?
>
> John KK9A
>
>
More commonly known as 0.141" semi rigid (vs 0.085 and 0.047.. there's
even tinier ones, and a bigger one )

The center conductor is copper clad steel, so the copper is carrying the
RF, at least in the typical microwave application.

There's also some "formable" coax which is more flexible than semirigid,
but stiffer than typical flexible coax. The challenge with semirigid is
that the copper jacket work hardens on bending, so you sort of get one
chance to bend it to the shape you need.

We use them at work when you worry about leakage (solid shield doesn't
let much though), and when you want the cable to be "self supporting"




> Máximo EA1DDO wrote:
>
> Hi all,
>
> I normally use RG400 for chokes on FT240 toroids.
> Recently I've tryed RG402 semi-rigid coax cable, the "blue one".
> RF properties are quite similar, in fact RG402 seems to be a bit
> better than RG400.
> Because RG402 is semi-rigid, is much easier to make tight turns on the
> toroids, easier to work with.
>
> After some months using it, HF bands legal limit amp, I can't see any
> issue.
> Just wondering if I am missing anything, or if someone else have tried
> the RG402 coax.
>
> Thanks
>
> 73, Maximo
>
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