[Amps] Pulse tuning

[Gary Schafer]

If you want to know if pulse tuning really helps try this:
Tune up your amp in the normal way with carrier for maximum  output.
Then turn on the pulse generator device with the same  amount  of drive and
see what the peak envelope power is.

Now retune for maximum peak envelope power out with the pulse signal drive.

How much difference in peak envelope power output is there?

Not how much  difference between pep and carrier but how much difference in
pep after the two different tune up methods. I bet it isn't much.

73
Gary  K4FMX


> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Robrk
> Sent: Thursday, September 23, 2010 8:04 AM
> To: W5CUL
> Cc: amps at contesting.com
> Subject: Re: [Amps] Pulse tuning
> 
> 200 and 600 seem a bit low. Wouldn't think 200 would pass through your
> audio chain or the IF filter. Maybe try 800 and 1200.  I hear 1004 in my
> sleep, after 30 years of point to point microwave testing.
> 
> Sent from my iPad
> 
> On Sep 23, 2010, at 8:39, "W5CUL" <w5cul at sbcglobal.net> wrote:
> 
> > I use a piece of software called Test Tone Generator to pulse tune my
> amp.
> > It is set for 200Hz for one pulse tone, and 600Hz for the other.  I have
> the
> > duty cycle for each tone set for 30%, which seems to work very well
> given I
> > operate SSB. It seems to me that it would be a more efficient tune if
> you
> > can mimic the mode of operation you plan on using when tuning your amp.
> >
> > 73,
> >
> > Mike
> > W5CUL
> >
> >
> > -----Original Message-----
> > From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
> On
> > Behalf Of David C. Hallam
> > Sent: Thursday, September 23, 2010 7:13 AM
> > To: Alek Petkovic
> > Cc: amps at contesting.com
> > Subject: Re: [Amps] Pulse tuning
> >
> >  What about pulse tuning using a two tone signal?
> >
> > David
> > KW4DH
> >
> > On 9/23/2010 7:58 AM, Alek Petkovic wrote:
> >> At 07:22 PM 23/09/2010, Bill, W6WRT wrote:
> >>> ORIGINAL MESSAGE:
> >>>
> >>> On Thu, 23 Sep 2010 03:57:11 -0500, donroden at hiwaay.net wrote:
> >>>
> >>>> If you have to pulse, you are relying too much on power supply
> > capacitors.
> >>>> Just build it "large" and don't worry about pulsing.
> >>>> Don WA4NPL
> >>> REPLY:
> >>>
> >>> I agree. If you HAVE to pulse to avoid damage, you amp is running on
> the
> >>> edge of self-destruction anyway. Beef it up so it can run full carrier
> >>> for at least five minutes at a time with no sweat. Then you can tune
> it
> >>> up the 'right' way.
> >>>
> >>> Bill, W6WRT
> >>
> >>
> >>
> >> Surely, with pulse tuning, you are getting the duty cycle as close as
> >> possible to ssb conditions. Therefore you are tuning your amplifier
> >> to the absolute optimum level.
> >>
> >> When you tune with full carrier, power supply sag come into play in a
> >> big way and so, once you have tuned your amp under constant carrier
> >> conditions, it will be less than optimum for ssb operation.
> >>
> >> Tell me if I'm barking up the wrong tree but I see pulse tuning as
> >> the obvious way to go.
> >>
> >> 73, Alek.
> >> VK6APK
> >>
> >>
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