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Re: [Amps] transformers

To: "'m.ford'" <k1ern@pioneerwireless.net>
Subject: Re: [Amps] transformers
From: "Gary Schafer" <garyschafer@comcast.net>
Date: Tue, 18 Jul 2006 09:59:07 -0500
List-post: <mailto:amps@contesting.com>

> -----Original Message-----
> From: m.ford [mailto:k1ern@pioneerwireless.net]
> Sent: Tuesday, July 18, 2006 5:23 AM
> To: Gary Schafer
> Subject: Re: [Amps] transformers
> 
> 
> ----- Original Message -----
> From: "Gary Schafer" <garyschafer@comcast.net>
> To: "'m.ford'" <k1ern@pioneerwireless.net>
> Cc: <amps@contesting.com>
> Sent: Tuesday, July 18, 2006 1:20 AM
> Subject: RE: [Amps] transformers
> 
> 
> >
> >
> >> -----Original Message-----
> >> From: m.ford [mailto:k1ern@pioneerwireless.net]
> >> Sent: Monday, July 17, 2006 9:52 PM
> >> To: Gary Schafer
> >> Cc: amps@contesting.com
> >> Subject: Re: [Amps] transformers
> >>
> >>
> >> ----- Original Message -----
> >> From: "Gary Schafer" <garyschafer@comcast.net>
> >> To: "'m.ford'" <k1ern@pioneerwireless.net>
> >> Cc: <amps@contesting.com>
> >> Sent: Monday, July 17, 2006 9:37 PM
> >> Subject: RE: [Amps] transformers
> >>
> >>
> >> >
> >> >
> >> >> -----Original Message-----
> >> >> From: m.ford [mailto:k1ern@pioneerwireless.net]
> >> >> Sent: Monday, July 17, 2006 12:47 PM
> >> >> To: Gary Schafer
> >> >> Cc: amps@contesting.com
> >> >> Subject: Re: [Amps] transformers
> >> >>
> >> >>
> >> >> ----- Original Message -----
> >> >> From: "Gary Schafer" <garyschafer@comcast.net>
> >> >> To: "'m.ford'" <k1ern@pioneerwireless.net>; "'Tom W8JI'"
> >> <w8ji@w8ji.com>
> >> >> Cc: <amps@contesting.com>
> >> >> Sent: Monday, July 17, 2006 11:16 AM
> >> >> Subject: RE: [Amps] transformers
> >> >>
> >> >>
> >> >> >
> >> >> >
> >> >> >> As for PEP. I always felt it was a  marketing term. Never
> bothered
> >> with
> >> >> it
> >> >> >> and from the lengthy discussion here I have learned nothing new.
> >> >> >
> >> >> > How else would you measure SSB power if not PEP?
> >> >> >
> >> >> > 73
> >> >> > Gary  K4FMX
> >> >> >
> >> >> >
> >> >> Hi Gary. Define the term "SSB power".
> >> >>
> >> >> Mike k1ern
> >> >
> >> > That's my question Mike.
> >> >
> >> > Rephrased; how would you rate the power output of an SSB transmitter?
> >> What
> >> > units would you express the output power in?
> >> >
> >> > 73
> >> > Gary  K4FMX
> >> >
> >> >
> >> Watts come to mind.
> >
> > What kind of watts?
> 
> Watts is Watts. You can re-visit the argument about rms vs average
> but in the end Watts is Watts. I think you are coming dangerously close
> to another term that is used in certain circles.  "talk power".
> 
> Mike k1ern

So you are telling us that peak power, peak envelope power and average power
all have the same meaning and are one and the same?

73
Gary  K4FMX



> 
> 
> >
> >>
> >>  I think what you are trying to ask is how would I measure
> >> the total power emitted from a transmitter that is modulated by single
> >> sideband voice.
> >> Two ways come to mind. First I would use a spectrum analyzer and crank
> up
> >> the
> >> persistance then measure the area under the curve. The rest is math.
> But
> >> now you have to assume a bandwidth.
> >
> > You would also have to designate a given time for the measurement. Watt
> > seconds would be the result? You would also have to know the amount of
> > compression and the frequency content of the audio.
> > PEP seems a little more practical.
> >
> >>
> >> The second way would be to actually calculate and sum the area under
> each
> >> envelope of each tone
> >> produced and do it in real time.
> >
> > It seems that would be a necessity with your method.
> >
> >>Oh, and while we are splitting hairs,
> >> don't forget the carrier
> >> suppression. A lot of ssb I hear, isn't.
> >
> > Also amount of distortion products present would be necessary to know if
> you
> > are worried about carrier.
> >
> >>
> >> As I recall, the  advent of PEP brought us cross needle peak reading
> power
> >> meters.
> >> I think an artificial horizon indicator would  yield more useable
> results.
> >>
> >> Mike  k1ern
> >
> > You seem to be saying that finding total average power over a given
> amount
> > of time would be the way to make the measurement. That would be highly
> > dependent on program material (voice frequency range, density, bandwidth
> > etc.) and would tell you little about the capabilities of a particular
> > transmitters power output abilities.
> >
> > The peak reading wattmeter still seems the most practical of solutions
> from
> > what you have described.
> >
> > 73
> > Gary  K4FMX
> >
> >
> >
> >
> >
> > --
> > No virus found in this incoming message.
> > Checked by AVG Free Edition.
> > Version: 7.1.394 / Virus Database: 268.10.1/389 - Release Date:
> 7/14/2006
> >
> >


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