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Re: [Amps] 160m mosfet linear amplifier problem with ferrite cores

To: amps@contesting.com, David Cutter <d.cutter@ntlworld.com>
Subject: Re: [Amps] 160m mosfet linear amplifier problem with ferrite cores
From: sasas asasas <tzitzikas_ee@yahoo.com>
Date: Sun, 18 Apr 2010 00:48:55 -0700 (PDT)
List-post: <amps@contesting.com">mailto:amps@contesting.com>
And how can i repair this problem???

--- On Sat, 4/17/10, David Cutter <d.cutter@ntlworld.com> wrote:

From: David Cutter <d.cutter@ntlworld.com>
Subject: Re: [Amps] 160m mosfet linear amplifier problem with ferrite cores
To: "sasas asasas" <tzitzikas_ee@yahoo.com>, amps@contesting.com
Date: Saturday, April 17, 2010, 12:15 PM

You might consider imbalance in each side of the primary which will cause a net 
dc to pass, saturation and over-heating.  This may be rubbish but it could get 
others thinking along a different path.

David
G3UNA


> HI. i have constructed this linear amplifier 500w rms (2kw pep) (50ohm) with 
> 12 mosfet irfp360, http://tzitzikas.webs.com/linear500w.jpg for 160m band.
> When i gave 3watts of driving r.f power, it gave to output only 190w at 
> 106VDC (6A current). Two radio amateurs who have construct this linear claim 
> tha it gives 500w
> r.f power at 110vdc.
> But when i tried to give 4watts of driving r.f power the ferrite Cores (43 
> material)
> of transformer T3 broken! Which do you think is the problem??
> 



      
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