ORIGINAL MESSAGE:
On Thu, 29 Jul 2010 16:27:58 -0400, "Carl" <km1h@jeremy.mv.com> wrote:
>I dont understand how moving the resonant frequency of the coil up and using
>the same resistor raises the Q?
REPLY:
If you are talking about the suppressor coil, it is not resonant and
has little effect on the VHF parasitic frequency because it is
bypassed by a low value resistor. Its purpose is to provide a
low-impedance path for the HF current around the resistor.
If one did not care about bypassing the HF around the resistor, one
could have only the resistor without a coil at all and the parasitic
suppression would be equally effective. Power loss would be high of
course, but it would work. I have never seen it done that way and I
mention it only to help folks understand what the purpose of the coil
is. I am not recommending it.
73, Bill W6WRT
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|