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Toroid or molded inductor in low voltage tank?
On 2006-07-10, K7ITM wrote:
try putting this circuit into "RFSim99" (a free program) Thanks, I'd been looking for something like that. unloaded Q of the inductor there to see the effects on performance, both loss and filter sharpness (-- rejection of unwanted signals). I see. So the reason that the Q matters so much is not that it affects the filter shape much (in this topology), but that it has a big effect on the amplitude of the (tiny) passband which provides additional separation from the unwanted signals. In this case it looks like raising from Q=50 to 250 gives about 4dB of "wanted" signal without really affecting anything else. couple minutes, the simulation can give you some insights to get you started and save a lot of time soldering, but expect to ultimately learn even more by actually building and measuring the circuit. I actually have such a circuit built, and I took some measurements today. I'll wind a 1.8uH inductor on a T37-2 tonight and compare. Thanks to all for the responses. -- Ben Jackson AD7GD http://www.ben.com/ |
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