On Jul 25, 2006, at 6:26 PM, Tom W8JI wrote:
>>> Why? Why do you think a Ham staring at an amplifier panel
>>> would understand the statistics of making a mod over a
>>> large
>>> scale field sample?
>>
>> Because if 1000 hams make that same mod and they all think
>> it was worth the effort then either 1) they are under mass
>> dilusion, or 2) something about it worked.
>
> First, how do you know 1000 people did that mod?
1000 didn't. guaranteed
>
> Second, millions of things are sold every year that do
> absolutely nothing. Look at the New Age things.
And how about MPG booster additives for gasoline?
>
> Third, it can easily be demonstrated in controlled tests it
> does no good at all.
With Mr. Rauch controlling the tests, it's a sure bet. However, when
tested on a HP Z-meter, low-VHF-Q parasitic suppressors have a Q of
under 2 while suppressors like those used in the 922, 3K-A, 2K-4 on
and on have a Q of c. 4.5. Since VHF suppressor Q is proportional to
parallel-equivalent R at the anode, VHF gain in an HF/MF amplifier is
proportional to the VHF suppressor's Q -- provided of course that the
tube is capable of amplifying at the anode's VHF self resonance.
>
>> You could
>> make the argument that the amps they modified were crappy
>> to begin with... well ok, maybe now they are less crappy.
>
> Or maybe even slightly more crappy.
Or you could ask some of those who have retrofitted low VHF-Q
suppressors and get their opinion.
>
>> Now, if you and I are unable to imagine an explanation for
>> why
>> it works, that hardly seems to be their fault.
>
> There really is no imagination to it. It's all very simple
> basic physics and basic electronics.
Correct.
> ...
R L MEASURES, AG6K. 805-386-3734
r@somis.org
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