>
>rich Wrote:
>
>>>>URLs? Bibliographies?
>>>
>>>For my point of view, please see:
>>> http://www.ifwtech.com/g3sek/boards/tetrode/tetrode-3.htm
>>>
>>Voltage regulation measurements would be nice.
>
>I don't quote the figures because they're almost embarrassingly good.
Agreed. The 723-based positive floating regulator in Figure 8 on my web
site regulates so well that I could not detect any drop at 1400v out on
my Fluke 3.5 digit DMM. The sticky-wicket with the 723 is a current gain
of >500,000, so keeping RF out of the beast takes a bit of doing.
>The output regulation, hum and noise are all typically below 100mV - a
>4-1/2 digit DVM doesn't flicker between no load and full load.
Impressive.
>That's certainly better than any power tetrode actually needs, but it's what
>the active regulator happens to deliver.
>
>>Were the IMD measurement relative to PEP or to the two tones?
>
>Relative to either of two equal tones, so they all look 6dB higher than
>the ARRL-style presentation (which is below PEP).
Thanks. This is the same way Eimac measures IMD. Much to the chagrin
of DAFers, I measure IMD with voice modulation, a HP step attenuator and
a double-filter receiver -- i.e., a PEP type measurement.
>More important are the differences between them.
>
Agreed. I would like to see a doubleblind measurement of % screen
regulation vs, % distortion with voice modulation.
cheers, Ian
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
end
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