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Title: Binocular coil question Post by: WA2SQQ on October 21, 2021, 03:12:01 PM I have a question that I can’t seem to find an easy answer for. When you wind a ferrite core each time the wire passes through the center counts as one turn. Instructions for this coil calls for a primary of 3 turns and the secondary at 12 turns. These binocular ferrite cores actually have two holes and I’m thinking they are actually two cores in one. Yes the picture suggests three physical loops through both holes. Does anyone know how you calculate the proper number of turns?
Title: Re: Binocular coil question Post by: M0VRF on October 21, 2021, 04:55:03 PM Barely matters as it's the RATIO you want.
Title: Re: Binocular coil question Post by: w9jsw on October 21, 2021, 07:18:04 PM one turn is a pass thru both holes on a bino.
Title: Re: Binocular coil question Post by: W4AMV on October 21, 2021, 07:24:53 PM While the ratio is maintained, it is key to have the proper inductance compared to the source and load Z. The convention is a pass thru both holes is one turn. A single pass is 1/2 turn and the inductance you obtain could be insufficient to provide the desired performance. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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