[Amps] Pulse tuning

[Alek Petkovic]

I have no reason to doubt that Gary.

I will try it this evening when I have finished the day's toil.

Sometimes it is fun to get in there and split hairs.
Alek. VK6APK

PS: Robrk. Downunder, we use 820Hz. That is apparently the frequency 
at which human hearing response peaks. In my 25 years in 
telecommunications, I don't believe I've ever seen 1004Hz used.



At 01:48 AM 24/09/2010, Gary Schafer wrote:


>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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