[Amps] 4CX250 IMD

[jeremy-ca]

----- Original Message ----- 
From: "Peter Chadwick" <g3rzp at g3rzp.wanadoo.co.uk>
To: <amps at contesting.com>
Sent: Sunday, September 30, 2007 3:53 AM
Subject: Re: [Amps] 4CX250 IMD


> RCA rate the 4CX250B  at 295 watts PEP output through a 95% efficient tank 
> circuit with 2000volts on the plate and -30dB 3rd order products, although 
> it doesn't say if that is -30dB with respect to one tone of a 2 tone 
> signal or -30dB  with respect to PEP.


Two tone PEP has been mentioned several times as the reference used for the 
4CX250R under discussion.


> Nobody has mentioned measurement uncertainty in this discussion, 
> either......

Oh yes it has. I asked how Eimac measured PEP in the 50's.  Some of the 
youngsters on here might be surprised to learn that the micropressor driven 
peak reading, self correcting and wash your windows sir, wattmeter hadnt 
been invented quite yet (;

Carl
KM1H



> 73
> Peter G3RZP
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