>
>
>-----Original Message-----
>From: measures <2@vc.net>
>To: Steve Thompson <rfamps@ic24.net>; AMPS <amps@contesting.com>
To: <amps@contesting.com>
>Date: 13 September 2000 14:40
>Subject: Re: [AMPS] Logic v. Magic
>
>
>>>
>>>
>>>-----Original Message-----
>>>From: measures <2@vc.net>
>>>To: Steve Thompson <rfamps@ic24.net>; AMPS <amps@contesting.com>
To: <amps@contesting.com>
>>>Date: 12 September 2000 20:25
>>>Subject: Re: [AMPS] Logic v. Magic
>>>
>>>
>>>>>
>>>>>
>>>>>-----Original Message-----
>>>>>From: Ian White, G3SEK <G3SEK@ifwtech.com>
>>>>>To: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
>>>>>Date: 12 September 2000 07:17
>>>>>Subject: [AMPS] Logic v. Magic
>>>>>snip
>>>>>Until I got down and crunched the numbers, I hadn't fully realised that
>>>>>the value of the suppressor Q is literally *useless*.
>>>>>
>>>>>I came to that conclusion.
>>>>>
>>>>Suppressor Q is directly related to Rp in Wes' measurements.
>>>
>>>I think the relationship is well rooted in physics, but Q is a function of
>L
>>>as well as R.
>>>
>>>>Rp is undoubtedly related to VHF stage gain.
>>>
>>>
>>>I think it's Rs that really counts,
>>
>>
>>Rs and Rp are mathematically related. If you have one, the other can be
>>derived. Wes measured Rp, the parallel equivalent of the series circuit
>>that the suppressor introduces into the anode-resonant circuit. (for a
>>discussion of Rp and Rs, see "Calculating Dissipation in Parasitic
>>Suppressor Resistors", March, 1989, *QST*).
>>
>>>but the point is that it's the R that
>>>matters. The Q in the *suppressor* isn't important. The Q in the *system*
>>>is.
>>
>>The anode's VHF-resonant depends on the suppressor for Q reducing total
>>Q. It seems to me that system Q involves the tank. The VHF anode
>>resonance has nothing to do with the tank.
>I meant system Q to refer to the resonant circuit in question, rather than
>the suppressor alone. In this case, the tube anode, suppressor, tune C and
>interconnections. Do you mean something different?
>
No. The interconnections typically have little R compared to the
suppressor.
later, Steve
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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