Fw: [Fox_Tango] FL 101

[Ken Wright]

Hi ken.
This was forwarded to me by mistake, although I am an FT person and have an
FT707.

73, Ken Wright M0KHW

----- Original Message -----
From: "daveg" <daveg@bcn.net>
To: <fox_tango@mailman.qth.net>
Sent: 24 March 2002 03:39
Subject: Re: [Fox_Tango] FL 101


> Ken -
>
> I've seen old tired 6JS6's behave somewhat like this.  What's the plate
> current doing - is it normal at full power and dropping off when the
output
> power does?
>
> Just guessing here - maybe a gassy tube...  with the top (main) cover off
in
> a fairly dark room key it up long enough to get the power fade.  You
should
> see just cathodes glowing orange, but little or no 'blue haze' in the
tubes
> and no plates glowing because they are overheated.  Same for the  driver.
>
> Dave Goodfellow, N2EPV
> have a 101EE and 101ZD
>
> Kenneth Crips wrote:
>
> > I have an FL101 transmitter which I have a problem I hope someone
> > else out has had.  This unit has fresh 6JS6C's and a good driver.
> > The problem is with the RF output. After tuning it up the output
> > is about 120 watts dive give or take 5-10 watts depending on the band,
> > and how hard I drive the finals, I normally hold it down to 100 watts.
> > 35 watts CW and AM phone.  The problem is power fade.  When I first key
> > the transmitter I have full output over a period of about five minutes
> > the power drops back to about 12 watts which is the level the driver
> > is exciting the finals.  When I unkey and wait for a few minutes it
> > will return to a higher output about 80 or so watts.  This time when I
> > key the transmitter the power drops off to about 12 watt over a period
of
> > several seconds.  Keep in mind The FL101 is a separate transmitter it's
> > output section is identical to the FT-101 series. Any Ideas what might
be
> > wrong?
> >
> >                          Ken de W7ITC
> >
> > Kenneth Crips
> > Amateur Radio Station W7ITC AMI-877
> > Ten-Tec Argosy 525, TS-520SE, Heathkit SB200,
> > R388/URR, R390A/URR, SBA-1, Gonset G64, HQ-129X,
> > SP600-JX17, Hallicrafter SX101A, BC-312N.
> >
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