Title: Knob & Tube Insulators Post by: Roy K8VWX on April 24, 2014, 11:12:43 AM I have a Ham friend looking for a couple of 10 or 12 inch crock tubes to bring open wire feeders into his shack. Any one have any laying around or what would be another choice of material for such?? TNX / k8vwx
Title: Re: Knob & Tube Insulators Post by: KB5MD on April 24, 2014, 11:15:15 AM I use the hot water type of PVC pipe. The outside diameter is about 1/2"
Title: Re: Knob & Tube Insulators Post by: Roy K8VWX on April 24, 2014, 11:41:57 AM Years ago I was running my BC 610 on a multiband open wire fed antenna using latter line out of the soffit of my garage with some PVC material as feed through insulators and had serious RF flashovers. The wood around the PVC tubes was very badly charred. Could have burned the garage down. ( The tubes were closely spaced )
Title: Re: Knob & Tube Insulators Post by: KA0HCP on April 24, 2014, 11:58:23 AM http://www.daburn.com/10-67metalbaseinsulators.aspx
Daburn.com has many types of ceramic insulators. http://www.daburn.com/10-30steatiteconeinsulators.aspx Title: Re: Knob & Tube Insulators Post by: W3GMS on April 24, 2014, 12:57:27 PM I have a Ham friend looking for a couple of 10 or 12 inch crock tubes to bring open wire feeders into his shack. Any one have any laying around or what would be another choice of material for such?? TNX / k8vwx Roy, I have always used big ceramic feed though insulators. I throw away the bolts that come with them and get some "all thread rod". If you drill things properly, the rod will not touch anything since its centered in the middle of the ceramic feed through. Put that in about 40 years ago and still working very well. Joe, GMS Title: Re: Knob & Tube Insulators Post by: W1RKW on April 26, 2014, 10:27:56 AM Glass tubing inside of PVC
Title: Re: Knob & Tube Insulators Post by: Detroit47 on April 26, 2014, 12:33:57 PM Teflon tubing is a stable and just about arc proof material to use.
http://www.professionalplastics.com/Teflon_PTFE http://www.polyzone.com/products/rods-tubes-profiles/ptfe-teflon-rod-tube Title: Re: Knob & Tube Insulators Post by: Roy K8VWX on April 26, 2014, 08:12:55 PM Thanks Guys for all the good input. I will pass this on to my friend in Tennessee. I think he is running SSB now but is very interested in AM also. 73 / Roy AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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