[AMPS] AL811H on AM

[R_Davis]

> > ::50 dots per minute is about 2 wpm.  Do you mean 50 wpm?

@@ Yeaaah - good shot - wpm.  Knob all the way to the right. One for you.

> > ::If you're sending dits, it's actually A1, not A0.

@@ 800 W out key down after it is tuned up.  A0! One for me.

> > ::The plate impedance is higher at lower plate currents, so of course
this
> > happens.  Seems you're doing it right, but I wouldn't spend a lot of
time
> > tuning up an FL2100B unless you want a close-up demonstration of the
"big
> > bang" theory.

@@ No worries mate.  I never, but NEVER key down at full power out for more
that 10 seconds, with 20 or more seconds in between.  Could that explain why
my FT-101E is still putting out 150 watts from its 1975 tubes?

Thanks for the reply and 73's.
Rick WD8JJA.



----- Original Message -----
From: "Steve Katz" <stevek@jmr.com>
To: "'R_Davis'" <WD8JJA@arrl.net>; <amps@contesting.com>
Sent: Friday, February 15, 2002 11:07 AM
Subject: RE: [AMPS] AL811H on AM


>
>
>
> > This brings up a question I have always had.
> >
> > We are always urged to tune for maximum power out at maximum drive.  For
> > SSB, I tune my FL-2100B (you guys already know this has 572B's) with 100
> > watts drive at ~50 dots per minute
> >
> > ::50 dots per minute is about 2 wpm.  Do you mean 50 wpm?
> >
> >  (or whatever the max. of my keyer is) for
> > maximum output, which is usually around 800 watts A0 into a dummy load.
> >
> > ::If you're sending dits, it's actually A1, not A0.
> >
> >
> > Now, for AM, RTTY, or some constant carrier mode, should the drive from
> > the
> > exciter be reduced without retouching up the tune/load controls?
> >
> > I typically repeak the output of both transmitter and amplifier when I
> > reduce the power.  This gives more power output with less plate current.
> > The
> > Plate control doesn't change much, but the Load reduces a lot when power
> > is
> > reduced.
> >
> > ::The plate impedance is higher at lower plate currents, so of course
this
> > happens.  Seems you're doing it right, but I wouldn't spend a lot of
time
> > tuning up an FL2100B unless you want a close-up demonstration of the
"big
> > bang" theory.
> >
> > ::WB2WIK/6
> >
> > ----- Original Message -----
> > From: "skipp isaham" <nospam4me@juno.com>
> > To: <amps@contesting.com>
> > Sent: Friday, February 15, 2002 12:37 AM
> > Subject: Fw: [AMPS] AL811H on AM
> >
> >
> > >
> > > Hi Chris,
> > > -
> > > For reasons I'd rather not get into, your simple question
> > > is a touchy one for many amps members.
> > > -
> > > Operation of an amplifier in AM mode should probably
> > > be no more than 25% of it's SSB ratings.
> > > -
> > > hope hat helps... I'm not sure of the AL811H, but a quartet
> > > of 811a tubes should at least do few hundred watts of
> > > AM output.
> > >
> > > cheers
> > > skipp
> > > --------- Forwarded message ----------
> > > From: Christopher Kaine <ckaine@one.net>
> > > I am trying to get information concerning running an
> > > AL811H amplifier on AM.
> > > The manual does NOT include directions/recommendations.
> > > TIA
> > > Chris Kaine
> > > N8JDG
> > >
> > > ________________________________________________________________
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>




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