[Amps] [BULK] - Re: SB200 loading problem

[John Parkins]

Hello Steve,

Well as I said I doubt the readings are accurate, given +/- 10% the
efficiency could be in the 60-65% range and as it looks good on the
scope it probably is. I'll note your comments though and keep an eye
on it.

Tuesday, September 20, 2005, 12:10:09 PM, you wrote:


ST> John Parkins wrote:

>> The anode current reads, for 500w out, 340mA so that works out to be
>> around 75%. Of course all these readings have a little + or - about
>> them as I have no idea how accurate the meter is.

ST> Efficiency as high as 75% indicates heavy saturation, which ties up with
ST>   the high anode load resistance. You will be getting higher gain, but
ST> at the expense of linearity and maximum output power. I'd suggest you 
ST> load it more heavily and drive it a bit harder. For good linearity, the
ST> efficiency will be more like 60%, no more than 65% at peak output.

ST> Steve
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-- 
Best regards,
 John                            mailto:kvp at bigfoot.com