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Questions about Murania radio speaker mounting
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Philip Karras <ke3fl@...>
I found four washers two are 1.25mm thick the other two are 0.75mm thick. All are metal so this will not protect the speaker frame from being connected to the traces in the holes. These holes are grounded. Questions: 1. Are the washers supposed to be two different thicknesses? If so which pair goes where? Thicker on top, bottom, left or right sides? 2. Is the speaker case supposed to be grounded? The instructions say, "...washers between the speaker and the panel to space the speaker from the frame up from the traces that run on the surface..." Metal washers won't stop the speaker from touching the grounded hole traces. Thanks for any clarification. tnx es 73 de KE3FL, Phil -----KE3FL Web Site:http://cs.yrex.com/ke3fl Karras' Corner: http://blog.solidsignal.com/author/philk/
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Robert
Phil There is many different vendors that we get our washers from. There is no constancy in the thickness of the washers. It really does not matter, the only purpose of the washers is to space the speaker off of the board Good luck with your build Bert N0YJ
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Jim, N5IB
Hi Phil,
It's OK for the metal speaker frame to touch and make electrical contact with the ground plane that surrounds the plated through mounting holes. But there are active traces that run underneath the speaker. Those the frame should not touch. But they are sufficiently far away from the washers. Given that you have a mismatched pair of washer thicknesses - don't put the like-sized ones diagonally opposite, since that would torque the frame. Put them on adjacent screws. I cut up old dark socks (after washing!) to make cheap "grill cloth" N5IB
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Philip Karras <ke3fl@...>
Hi Jim, Thanks I figured to match them as pairs on a side or top/bottom, not as you said not to opposite corners. I've done similar for grill cloth, I'll have to see what I have around for that. I have plenty of dark socks just not ready to be cut up ;-) 73 de KE3FL, Phil ARRL OES, ORS, & VE ARRL Life Member KE3FL Web Site:http://cs.yrex.com/ke3fl Karras' Corner: http://blog.solidsignal.com/author/philk/
On Wednesday, February 10, 2021, 6:29:05 PM EST, Jim, N5IB <n5ib@...> wrote:
Hi Phil, It's OK for the metal speaker frame to touch and make electrical contact with the ground plane that surrounds the plated through mounting holes. But there are active traces that run underneath the speaker. Those the frame should not touch. But they are sufficiently far away from the washers. Given that you have a mismatched pair of washer thicknesses - don't put the like-sized ones diagonally opposite, since that would torque the frame. Put them on adjacent screws. I cut up old dark socks (after washing!) to make cheap "grill cloth" N5IB
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Philip Karras <ke3fl@...>
Thanks again Bert. 73 de KE3FL, Phil ARRL OES, ORS, & VE ARRL Life Member KE3FL Web Site:http://cs.yrex.com/ke3fl Karras' Corner: http://blog.solidsignal.com/author/philk/
On Wednesday, February 10, 2021, 6:02:58 PM EST, Robert <e1dslr@...> wrote:
Phil There is many different vendors that we get our washers from. There is no constancy in the thickness of the washers. It really does not matter, the only purpose of the washers is to space the speaker off of the board Good luck with your build Bert N0YJ
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