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

[sasas asasas]

Hi. All of my instruments are ok. This linear is only for 160m band and for bellow frequences (for tests only in dummy load). I have not test it at higher frequences and my pll exciter works maximum at 1900khz. 
I didn't tried to replace the broken ferrite with two in series. It is a good idea but i have only one. I will order some pieces from Amidon and i will try this.


--- On Sun, 4/18/10, Ron Youvan <ka4inm at tampabay.rr.com> wrote:

From: Ron Youvan <ka4inm at tampabay.rr.com>
Subject: Re: [Amps] 160m mosfet linear amplifier problem with ferrite cores
To: "amps" <amps at contesting.com>
Date: Sunday, April 18, 2010, 5:02 AM

Hi  sasas asasas:

> And how can I repair this problem???

> 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.

   I haven't found the detail of this amplifier yet, was this amplifier designed for 160 meter at 
the same gain and efficiency as the other bands?
Did you test the gain and efficiency at 7 MHz and compare it to 1.6 MHz?
Did you try to replace the broken core with two in series and repeat the above tests?

   Are you sure of your test apparatuses, the Voltmeter, Ammeter, Wattmeter and the test load?
-- 
    Ron  KA4INM - The next election, I know what is going to happen, I'm going to help.
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