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#11
April 28th 09, 02:14 AM
posted to rec.radio.amateur.homebrew
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Source for high-Q HF inductors
Tim Wescott wrote:
Joerg wrote: Joel Koltner wrote: Are there some vendors of readily available (stock) inductors that have reasonably good Q's (100) throughout the HF band? I'm familiar with something like the Coilcraft "maxi springs" (http://coilcraft.com/maxi.cfm), and while they hit Q's of 100 by 30MHz, I'd really like something that's already there by 3MHz or less (...and still have a self-resonant frequency of 30MHz). This seems quite doable simply by making a larger coil with thicker wire, I'd just like to find a place that offers such inductors off-the-shelf rather than having to wind my own. Inductance in the ballpark of 1-10uH would be good, although it's not critical. The goal here is to try out making some adjustable notch filters for a receiver (by switching L's and C's in and out, like antenna tuners do). Hence, high Q is important, but power handling capability isn't so much, and anything smaller than a breadbox is fine size-wise. There isn't much of a market for this stuff anymore, at least not since the days of cloth-insulated wire :-) Since it's for a receiver, how about building a Q-multiplier? Ok, many youngster will scoff at that as being "archaic" but those things can really rock. I second that motion (since I'm not doing the work...). I had thought of suggesting it, I should have done so. But now we gave away our age ;-) -- Regards, Joerg http://www.analogconsultants.com/ |
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