[Amps] transformers

[Gary Schafer]

> -----Original Message-----
> From: m.ford [mailto:k1ern at pioneerwireless.net]
> Sent: Monday, July 17, 2006 9:52 PM
> To: Gary Schafer
> Cc: amps at contesting.com
> Subject: Re: [Amps] transformers
> 
> 
> ----- Original Message -----
> From: "Gary Schafer" <garyschafer at comcast.net>
> To: "'m.ford'" <k1ern at pioneerwireless.net>
> Cc: <amps at contesting.com>
> Sent: Monday, July 17, 2006 9:37 PM
> Subject: RE: [Amps] transformers
> 
> 
> >
> >
> >> -----Original Message-----
> >> From: m.ford [mailto:k1ern at pioneerwireless.net]
> >> Sent: Monday, July 17, 2006 12:47 PM
> >> To: Gary Schafer
> >> Cc: amps at contesting.com
> >> Subject: Re: [Amps] transformers
> >>
> >>
> >> ----- Original Message -----
> >> From: "Gary Schafer" <garyschafer at comcast.net>
> >> To: "'m.ford'" <k1ern at pioneerwireless.net>; "'Tom W8JI'"
> <w8ji at w8ji.com>
> >> Cc: <amps at 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?

> 
>  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