Rich,
Yep, your correct, I wasn't thinking about the differences in the
readings. So in turn it would double the voltage values. Don't know why
I was thinking that, must be getting senile?
Will
R. Measures wrote:
On Aug 30, 2004, at 10:42 PM, Will Matney wrote:
Rich,
1500 watts PEP on a 300 ohm load. Sqrt of 1500 X 300 = 670.8 Volts.
1500 v x 300 ohms = 450,000 and the sqrt of 450,000 = 670.8. On a 50
ohm load, 1500 watts PEP x 50 = 75,000 and the sqrt of 75,000 =
273.86 V. That would be in peak volts though as I would figure the
power measured with a true peak reading wattmeter. The peak voltage
would then have to yield a peak voltage in this circumstance wouldn't
it? An RMS reading watt meter would be 1.414 times the voltage
calculated yielding peak voltage?
For a sinewave, RMS V is 0.707 of peak V. When talking about AC, the
type of V must be specified as either peak, peak-to-peak, or RMS.
Also, PEP is not peak power, it is based on the RMS value of the
observed peak. Thus, 1500W-PEP = 3000W-peak.
Will
R. Measures wrote:
On Aug 30, 2004, at 6:20 PM, Will Matney wrote:
I failed to mention that the values I were mentioning earlier, in
the designs I was using, were for a Pi tank circuit and not a Pi-L.
Thus the load C would have seen a different load resistance of
about 300 ohms or so. For 1500 watts PEP on a 300 ohm load, a
voltage of 671 volts would be incurred. At the 50 ohm load for a Pi
tank, load C would see about 274 volts. So a capacitor with a
rating of at least 2.5 : 1 difference would be needed. Where V =
sqrt of W x R.
- Peak-V or RMS-V?
Will Matney
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
__________ NOD32 1.817 (20040719) Information __________
This message was checked by NOD32 antivirus system.
http://www.nod32.com
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
__________ NOD32 1.817 (20040719) Information __________
This message was checked by NOD32 antivirus system.
http://www.nod32.com
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|