Re: Total insanity....500KW 11m amp being built.
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Hi Jim,
Your're exactly right!?? i agree, the Only way is grid drive.?? Thanks for taking time do the math and and expose the massive plate? current on peaks.
Regardless, it's a crazy project but we are getting to exercise our imagination and exploring the limits of big steel tubes.
73's, Mike?
VK6ADA
Mike, where are they gonna obtain a modulation xfmr ??? ? Per the? Eimac spec sheet for plate modulated AM,? ?the secondary of the modulation xfmr would have? 15 kvdc across it...and 23.4 amps? flowing through the sec of the modulation xfmr.? ?The 15 kv across the modulation xfmr will rvs in polarity.....and the sec of the mod xfmr is in series with the 15 kv? B+.? ? And that's just for 100%? positive modulation.
IE:? the B+ would? swing to? +30 kv? on positive mod peaks..... and down to 0 volts? on negative peaks.?
15 kv? @ 11.7 amps = 175.5 kw modulation xfmr.? ?At the crest of the positive modulation,? B+ on the anode? is now? 30 kv....and plate current is now double at 23.4 amps.?
Let's assume plate modulation is not happening any time soon.?
They shoulda just run it grid driven, for linear service? like on the spec sheet.? ?200 kw pep out, and 50 kw cxr......which? swings to 75 kw.? ?That's 25 kw of total swing....( 25 kw of? total sideband power)..., with just 12.5 kw into each sideband.?
Still a wasted effort.? The 3x6 amp puts out 12.5 kw pep on ssb.?
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Mike Peace