>
>re: coating of conductors
>
>I've had two past experiences which make be believe coating certain
>conductor application are a bad practice.
>
>1) The first project was a simple 2 element yagi for 52.525MHz.
>The unit preformed well using a standard gamma match to 50
>ohm coax. Upon completion and final testing of the yagi, I
>decided to spray the gamma with urethane for moisture prevention.
>
>The impedance of the gamma changed radically. Tests with
>the basic instruments I owned at the time proved the coated
>gamma was the problem. I tried to remove the coating
>with various chemicals, but I was never able to restore
>that network to a usable form.
? Did you try soaking it in acetone or methyl-ethyl-keytone? It is my
opinion that urethane should never be sprayed on since you must be very
careful to keep it away from contact areas. Better to use a watercolour
brush so you can control where the urethane is applied. Contact areas
are best protected with dow corning DC4 silicone grease. It does not
interefere with an electrical contact.
>......
- Rich..., 805.386.3734, www.vcnet.com/measures.
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