3500 watts pep output would require a carrier of a maximum of 875 watts
if it were 100% modulated.
If the amp runs 65% efficiency at full output that means that the
efficiency must drop to 1/2 that at carrier level or around 32% for
proper AM operation.
At 875 watts out with 32% efficiency would require an input power of
2734 watts for carrier. Subtract the 875 watts from that and you are
left with about 1860 watts of plate dissipation power! That doesn't
sound like any kind of CCS class B amplifier to me for a single 4-1000.
Maybe a pair of 4-1000's?
73
Gary K4FMX
James M. Walker wrote:
In a properly designed and adjusted 4-1000A Class B amplifier,
the approximate maximum power output in class "B" is 3.5 KW.
That is CCS, and not ICAS. An amplifier of this output class was
presented in a 195x Radio Engineers Handbook. The design works
as the rig verifies, modes are AM/CW from the DX-100. Adjustments
are left as an exercise for the student.
Jim
WB2FCN
----- Original Message -----
From: "Darrell, WA5VGO" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; "Discussion of AM Radio"
<[email protected]>
Sent: Thursday, January 13, 2005 6:35 PM
Subject: Re: [AMRadio] AM Amps
Got to be CW, RTTY, etc. With AM you would either melt the tube down or
splatter all over the band.
73,
Darrell, WA5VGO
At 04:49 PM 1/13/2005 -0500, you wrote:
How do you reduce the drive for AM? I take it that is how you operate CW?
73
Gary K4FMX
James M. Walker wrote:
Hum,
4-1000A G.G. amplifier, 3000 VDC plate, 700 MA Plate I, 500 MA
Grid I, with 125 Watts out of DX-100 running apprx 2100 W input and
dissipating 670 watts plate = approximately 1430 watts output!
While the carrier level into 50 ohm dummy load is 1400 watts measured
and a really NICE orange glow! This is with a 200 cfm blower, air system
socket and chimney.
Jim
WB2FCN
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