[Amps] How lossy is Nylon at 50 MHz?

[Carl]

Thats interesting since Ive been using black Delrin as the center insulators 
on a 16el 6M bedspring collinear for about 12 years which is right at the HV 
point.

Several of my wire antenna end insulators are from regular Delrin and have 
survived well over 20 years with no sign of distress last year when I 
replaced the ropes.

Carl
KM1H


----- Original Message ----- 
From: "lee" <pulsarxp at embarqmail.com>
To: "David Kirkby" <david.kirkby at onetel.net>; <ka4inm at gmail.com>
Cc: "amps" <amps at contesting.com>
Sent: Saturday, July 07, 2012 6:16 PM
Subject: Re: [Amps] How lossy is Nylon at 50 MHz?


>
> Delrin has very good insulating properties until it picks up moisture.
> Delrin is Hydroscopic and is not a good insulator once it has picked up
> moisture.  it is not a good choice for outdoors.  Nice stuff though as it
> machines very nicely.
>
> Lee, w0vt
>
>
>>    All nylon has rather poor weather resistance, even the UV resistant
>> flavors.
>> Use "delrin" if at all possible instead.
>> --
>>     73 Ron KA4INM - All E-mail sent to this address shall linger in the
>> Google cloud forever!
>
> That's not a concern to me. This will be burried in potting compound,
> inside a plastic box. The plasitc box and potting compound have been
> used many times for antennas and present no problems. I'm only a bit
> worried about heating of the dielectric, but I don't think it will be
> sufficient to cause a problem. But since it is in potting compound,
> the heat can't escape easily.
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