http://eb104.ru/internet-magazin/lpf-filtra-dlya-shpu/lpf1000w-fnch-diplekser-1000-vt/lpf-filtr
I have two of these. They have not been trouble free, but part has been my
fault. They have been reliable for the last year after changing some caps
I also took out the load resistors and replaced them with a 100w flange
resistor mounted on a heatsink.
73, Tom W2SC
Sent from my iPad
> On Dec 12, 2016, at 8:06 AM, Jim Thomson <jim.thom@telus.net> wrote:
>
> Date: Sun, 11 Dec 2016 15:42:54 -0500
> From: "qrv@kd4e.com" <qrv@kd4e.com>
> To: amps@contesting.com
> Subject: Re: [Amps] SS amps and auto-tune. Is it even necessary?
>
> What might it cost of someone made and sold a filter like this?
>
> For a homebrew driver source, variously rated 10w, 120w, and for
> an amp 600w and 1200/1500w?
>
> http://www.qsl.net/wm5z/qex199907.pdf
>
> 73, David KD4E
>
> ## This is an ingenious use of a Diplexer. I dont see a reason why this
> concept
> could not be scaled up to the 1500++ level. If you look closely at his
> schematics, its just
> a LP + HP filter....with a 50 ohm dump resistor on the output of the HP
> filter.
>
> ## harmonics..esp the 3rd, are not reflected back to the transistors like a
> typ LP filter....degrading IMD.
> Instead the harmonics are eaten up by the dump resistor.
>
> Jim VE7RF
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