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FB ON YR HB AM XMTR! DE ED, KI6DCB (Seventy-two years old and off-air until I build a new shack with acres of antennas (antennae? HI HI) ready to go. I'm going to be using Icom's excellent IC-275H,

It's average Watts, not RMS Watts. RMS Volts (0.707 peak) X RMS Current (0.707 peak) = Average Power 0.707 X 0.707 = 0.5 RMS Watts does not exist. There is peak power and average power but no RMS

Eimac data sheet does show 890 watts out, but the plate voltage needs to be 3500 at full load. The AL-80 amps do not have this much plate voltage. Unless you’re a CBer on 11M. Hi hi also, in Class C

See https://en.wikipedia.org/wiki/Root_mean_square for the full treatise. 73, Kim N5OP

Power is RMS. Power can vary, but it's always RMS. The idea is that for sine wave AC, RMS voltage and current will dissipate the same power as the DC values for both. My digital vector RF watt meter

Keep in mind that a single sine wave cycle has an RMS value that is peak/1.414. 73, Kim Elmore

I believe those were peak *input* power levels. This is what upset AM fans so much when it was changed to 1500 W peak output, because they could get more than 1500 W peak? power with 2000 W peak

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

Grids don’t have enough thermal mass for protection like a plate has. Exceeding peak values are enough to blow out a grid. Many moons ago, I had a Henry 3-KA it had a pair of Eimac 3-500Zs had sheet

Ahhha... in that example, Eimac is calling the *SWING* of plate or grid voltage "*peak*". *I've* always considered the "peak plate voltage" to be the *most positive voltage* that the plate can attain

Sorry, Eimac said different in "care and feeding of power grid tubes". Your formula is for driving power. 73 Peter -----Original-Nachricht----- Betreff: Re: [ham-amplifiers] SB-1000 Datum:

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

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

Hmmmm….It seems to me that Vgc should be the RMS, NOT the peak value in determining the grid dissipation. The RMS value will determine the actual amount of heating. This makes the dissipation

I agree Lou, and I have also heard Tom talk about time, duty cycle and “thermo lag”

Don’t forget that the ratings on the tube are key down 24/7 CCS.. ?W8JI will tell you like he said hundreds of times before that the killer of tubes is not a slight over plate or grid current

The formula for grid dissipation is Pg = Vgc X Ig where vgc is the peak positive grid to cathode voltage. Ig is the DC grid current. grid dissipation is peak voltage multiplied by Grid current. If you

The person to ask to clarify this would be the man who designed the SB1000 and AL-series: Mr. W8JI, hisself. Steve, K0XP

V-rms obviously yields watts-RMS, and Volts-peak gives watts-peak. Because SSB is measured by it's peak: Peak Envelope Power. RMS only applies under continous carrier conditions. Steve, K0XP

On Wed, Apr 16, 2025 at 08:20 AM, KG2RG wrote: > > Jim, W6SAI, best book around!!! Sometimes called the West Coast book, > sometimes called the big green book, the Radio handbook by William ?I Orr, >