[Amps] parasitic LC>load?

[R.Measures]

On Nov 12, 2004, at 7:20 AM, StephenTetorka at cs.com wrote:

> Say his single loop is about 2 inches in diameter.
> Inductance is around 0.1 microhenries.
> At 50 MHz XL is 30 ohms; at 150 MHz its 95 ohms.
> Using 0.010 inch diameter wire having a Resistivity of 200, the wire 
> resistance is 2 ohms per foot.
> Say 1 foot was used for his coil.
> Q is 15 @ 50 MHz and 48 @ 150 MHz.
>
> Resonance for 50 MHz needs about 95 Pf and about 10 Pf for 150 MHz.

As I understand it, Stephen, the lossy pickup hoop in the 100kW 
amplifier was not resonated.  My impression was that the hoop was 
larger than 2-in diameter.  What I would like to find out is:   How 
does one optimize the placement, diameter and orientation of a lossy 
hoop?
>
> Notes:
> Wire diameter of 0.010 inches is 30 AWG which is rather small.
> Wire Resistivity for 'resistance wire' ranges from 30 to 875 
> Ohms/Circular-Mil-Foot...Copper is 13.71
>
>
>
> "R. Measures" <r at somis.org> wrote:
>
>>
>> On Nov 11, 2004, at 1:39 PM, StephenTetorka at cs.com wrote:
>>
>>> Hi all:
>>>
>>> Been thinking.
>>>
>>> If some of these rigs 'want to' go parasitic, would it be beneficial
>>> to help them via a broadband VHF resonant circuit that is coupled to
>>> the HF RF tank with that VHF LC discharging into a dissipative
>>> side-load?
>>>
>> According to a friend who used to work for an amplifier manufacturer,
>> their 100kW MF-HF model had a resistance-wire hoop suspended in the
>> output compartment to dampen the compartment's VHF resonance.
>>
>>> Regards,
>>> Steve
>>> WA2TAK
>>> _ Richard L. Measures, AG6K, 805.386.3734.  www.somis.org