The negative peak occurs 180 degrees away from the positive
peak, so they don't occur at the same time. You can't add them
together.
PEP power is the same power level as you would have KEY DOWN
at a given power level except whatever little extra you'd obtain
from power supply dynamics, typically 5 to 10 %.
A amp that runs 1000 watts output carrier is going to run 1000
watts PEP output plus maybe 5 to 10 % during SSB use, its
the average power that is going to vary considerably.
Mark WB8JKR
On Thu, 7 Nov 2002 10:20:59 -0500 "Martin, Maximo"
<Maximo.Martin@icm.siemens.com> writes:
> RMS is an average measurement, efective power instead PEP, it's peak
> to
> peak.
> If you take one peak without flat-topping you have the RMS, but it
> is from
> the half of the total, in a graphic you use only the upper half part
> of the
> signal, but PEP is from the top peak to the bottom peak so it is
> more than
> double, it is 2.25 times.
>
> Max.
>
>
>
> -----Original Message-----
> From: DF3KV@aol.com [mailto:DF3KV@aol.com]
> Sent: Thursday, November 07, 2002 9:52 AM
> To: Maximo.Martin@icm.siemens.com; amps@contesting.com
> Subject: Re: [Amps] RMS-PEP & 2x8877
>
>
> I
>
>
>
>
> 2 x 8877 are able to run about 4.5 to 5 Kw out, but this is a RMS
> measurement. The PEP value is the RMS x 2.25 so; 4.5 x 2.25= + 10000
> W
>
> Max.
>
>
>
>
> Hello Max,
>
> Please explain why PEP should equal 2,25 x RMS wattage?
>
> For my knowledge so far PEP ist the RMS wattage at the peak of the
> envelope without flat-topping.
>
> 73
> Peter
>
>
>
>
>
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>
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