Hi Barrie, Tradeoffs... Round is the optimum shape for highest Q (i.e. lowest loss) per cross section of material. Ribbon allows for greater inductance in a given volume. 73 & Good morning, Marv WC6W -- "Barrie Smith" wrote: Looking at both fixed and rotary inductors, I see examples wound with round wire and with "on-edge" ribbon. Is there some advantage, or reason to use one or the other? I can see, in the case of a rotary inductor, a greater contact area for the travelling wiper. Other reasons? 73, Barrie, W7ALW _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps ___________________________________________________________________ Try Juno Platinum for Free! Then, only $9.95/month! Unlimited Internet Access with 250MB of Email Storage. Visit http://www.juno.com/value to sign up today!