Message-ID: <000801c88111$a25c1530$0e00000a@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <47D1A6FF.1080803@telia.com> <00d001c8809a$71f10940$0900a8c0@Lark> <Pine.LNX.4.64.0803072006550.31396@plato.ucs.mun.ca> <001301c880b3$c8f8a9a0$0900a8c0@Lark>
Date: Sat, 8 Mar 2008 11:43:21 -0000
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Subject: Re: LF: Re: Smaller DC feeding choke in class E amplifier
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Hi Alan,

I never could get a handle on using passive components to  feed pulse amps , 
a sort of
contradiction ? what do  they do  in a mobile phone ?

G ..


----- Original Message ----- 
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Saturday, March 08, 2008 12:30 AM
Subject: Re: LF: Re: Smaller DC feeding choke in class E amplifier


> Hi Joe , Thanks for the "plug" :-))
> Yes the circulating currents get pretty large with the low impednces when
> you try to put high power out with 12 supply. It doesnt do some caps a lot
> of good either (think of the current density in the thin foil!). Most of 
> my
> tests were done at 35v or higher and that is a lot easier.
> Best Wishes de Alan G3NYK
>
> ----- Original Message -----
> From: <jcraig@mun.ca>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Friday, March 07, 2008 11:47 PM
> Subject: Re: LF: Re: Smaller DC feeding choke in class E amplifier
>
>
>> Alan, Johan and group,
>>
>> Since experimenting on LF I have discovered the joys of Class E,
>> many thanks to Alan.  My first 100W TX used an IRF-640 as
>> suggested on Alan's web page.  A dozen of them could be had for about $10
>> in 2003.  Unfortunately, they are have gone up quite a bit since then,
>> although much cheaper than a 6146!   There seems to be a new generation
>> of hexfet such as the IRFP260 and perhaps it might be possible to use 
>> this
>> in a 12volt 100w amp.  Unfortunately, many  640's came to an untimely
>> demise in my unsuccessful attempts to get 100 watts with a 12 V supply.
>>
>>
>> 73
>> Joe VO1NA
>>
>
>
>
>
>
> -- 
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