Message-ID: <1636a130273.marcocadeddu@tin.it>
Date: Wed, 16 May 2018 19:50:20 +0200 (CEST)
From: "marcocadeddu@tin.it" <marcocadeddu@tin.it>
To:  <rsgb_lf_group@blacksheep.org>
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Subject: R: LF: Re: [rsgb_lf_group] Capacitors at MF
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Hi David,

if I may add my comments hope you have more doubts :-)))

in the last couple of months I experienced a multiple caps buy...
I will do not use any longer in low pass filters or for decoupling 
purposes or power transfer polyesther caps disregrading their voltage 
class, they almost fail even at low power level (maybe not for a 10W 
LPF).
I found useful in most part of application the polypropilene caps of 
Wima both of the MKF and FKP series but for power transfer specially at 
medium and high power levels my appointment is for Cornell Dubilier 
caps of the 940 serie: they are not cheap but they are worth and by the 
way their datasheet is the only one reporting current capability and AC 
voltage in function of the frequency.

GL
Marco IK1HSS
----Messaggio originale----
Da: daveyxm@virginmedia.com
Data: 16-mag-2018 18.21
A: <rsgb_lf_group@yahoogroups.co.uk>, <rsgb_lf_group@blacksheep.org>
Ogg: LF: Re: [rsgb_lf_group] Capacitors at MF

David


I'd have no hesitation in using the poly caps.

Some ceramics are terrible.

The proof of the pudding comes in whether or not they heat up, but at 
10W...


Dave


> On 15 May 2018 at 09:54 "David G0MRF g0mrf@aol.com [rsgb_lf_group]" 
<rsgb_lf_group@yahoogroups.co.uk> wrote:
> 
>      
> 
>      
> 
>     Hi all.
> 
>     I'm trying to select some 8n2 capacitors for use in a low pass 
filter at 630m
>     They need to handle about 10 Watts maximum but I can't decide if 
I should
>     avoid or accept Polyester (PET),  Multi layer ceramic or 
Polypropylene.
> 
>     The polyester isn't one I've worked with before with RF, but it 
seems available in 5%
>     and with voltages around 250V DC at reasonable cost.
> 
>     Any thoughts??
> 
>     73
> 
>     David
> 
>      
> 
>     __._,_.___
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> 
> 
>     ---------------------------------------------
>     Posted by: David G0MRF <g0mrf@aol.com>
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