Keep in mind that a single sine wave cycle has an RMS value that
is peak/1.414.
73,
Kim Elmore
On 4/17/2025 6:32 PM, Kim Elmore wrote:
That's simply incorrect. Our voice "peaks" are very long,
compared to the RF frequency, they they have do indeed have a
running RMS value. "Peak" on a watt meter is the peak power,
which is always part of a a running-RMS (like a running mean but
RMS instead) power.?
Your house current id 60 Hz and has a peak voltage of about 169
V. Is your light blulb or power input to you amp rated based on
120 VAC or 169 V peak AC? Yes, wire insulation must be rated for
the peak voltage it is to with stand, but it's current carrying
capacity is rated in the RMS current. There is no such thing as
"RMS power": it's simply power, computed based on the RMS
voltage, current, or the RMS voltage squared over the impedance,
or the RMS current squared milipaited by the impedance.
73,
Kim N5OP
On 4/17/2025 6:04 PM, Adrian Fewster
via groups.io wrote:
Well our RF wattmeter usually has peak and avg selections ??
RMS is converting the AC to a DC value that is constant to
determine the constant heat W emitted. At a peak time
snapshot , peak power and peak voltage are true for that
moment.
Think of it like shoveling coal into a boiler. The heat
produced is determined by the average coal added? time rather
than peak
coal added in a moment.
So 'peak RMS values ' does not make sense, as once converted
to rms there are no peaks nor valleys for the math purpose.
73
vk4tux
On 18/4/25 05:33, Kim Elmore via
groups.io wrote:
I can¡¯t help but chime in: RMS is the only value that makes
sense. Outlet voltage in your house is 120 V RMS. There¡¯s no
such thing as ¡°RMS power¡±; peak power come from peak RMS
values.?
Kim
N5OP
"People
that make music together cannot be enemies, at
least as long as the music lasts."?--
Paul Hindemith
?
Duty cycle is considered. These are peak voltage
obtained by 100% duty cycle continues wave.
?
the Eimac formula for calculating grid
dissipation is based on peak.?
Pg = vga X Ig
?
anyway, anything I state is like I said, this is
what I know, how I calculate it. I¡¯m not an
engineer, just an amateur. There are plenty of
engineers floating around here and if I¡¯m incorrect,
I would love to be corrected as that would benefit
myself and I¡¯m always open to learning more. Any day
I can learn is a day of victory.
?
PS, this stuff is the fun part of the hobby!?
?
73!!
--
Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU
School of Meteorology, CCM, PP SEL/MEL/Glider, UAS, N5OP,
2nd Class Radiotelegraph, GROL)
¡°Listen, it's too big a world to
be in competition with everybody else. The only guy I
have to get better than is who I am right now.¡± ¨C Col.
Sherman T. Potter, 4077 M.A.S.H.
--
Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU
School of
Meteorology, CCM, PP SEL/MEL/Glider, UAS, N5OP, 2nd Class
Radiotelegraph, GROL)
¡°Listen, it's too big a world to be
in competition with everybody
else. The only guy I have to get better than is who I am
right now.¡± ¨C Col.
Sherman T. Potter, 4077 M.A.S.H.
