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@tampabay.rr.com> wrote:
From: Ron Youvan <ka4inm@tampabay.rr.com>
Subject: Re: [Amps] 160m mosfet linear amplifier problem with ferrite cores
To: "amps" <amps@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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