Ron,
> I have been looking at this schematic all week. I don't
> get the "500w rms - 2 kW PEP" thing, that doesn't make sense
> to me.
This amplifier is specified for AM. 500W RMS = 500W carrier.
500W carrier = 2 KW PEP.
73,
... Joe, W4TV
> -----Original Message-----
> From: amps-bounces@contesting.com
> [mailto:amps-bounces@contesting.com] On Behalf Of Ron Youvan
> Sent: Saturday, April 17, 2010 9:24 AM
> To: amps
> Subject: Re: [Amps] 160m mosfet linear amplifier problem with
> ferrite cores
>
>
> HI sasas asasas:
>
> > Hi, I have constructed this linear amplifier 500w rms (2 kW
> pep) (50
> > Ohms) with 12 mosfet irfp360,
> http://tzitzikas.webs.com/linear500w.jpg
> > for 160m band. When I gave 3 Watts of driving power, it
> gave to output
> > only 190 W at 106VDC (6A current). Two radio amateurs who have
> > construct this linear claim tha it gives 500w r.f power at 110vdc.
>
> I have been looking at this schematic all week. I don't
> get the "500w rms - 2 kW PEP" thing,
> that doesn't make sense to me. RMS isn't that different from
> average and 2 kW PEP is about the same
> as average.
> Also, 106 V. X 6 Amps. = 636 Watts at 50% efficiency TPO =
> 318 Watts is all you should be looking
> for. (at this drive level)
>
> The device substitution has possibly reduced the
> amplifier's gain and efficiency.
>
> > But when I tried to give 4 watts of driving r.f power the ferrite
> > Cores (43 material) of transformer T3 broken! Which do you think is
> > the problem??
>
> First, type 43 is correct for the HF HAM bands, but I am
> not sure about the top band. You need to replace the broken
> core and test it "just for gain" (no more than 2 Watts of drive) at 7
> MHz then compare the gain on 160 m.
>
>
> > http://tzitzikas.webs.com/linear20a.JPG
> > http://tzitzikas.webs.com/ferrite_broken1.JPG
> > http://tzitzikas.webs.com/ferrite_broken2.JPG
>
> Yup, broke.
> --
> Ron KA4INM - The next election, I know what is going to
> happen, I'm going to help.
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