Hi Grant The issue with some black insulators - with RX antennas they might not go up in smoke, however they are still not a good insulator at RF - even for RX antennas.
When coloring black - no carbon should be used - those can be a good insulator. I have been "burned" by black in the past. Why take the chance? 73 Tim K3LR -----Original Message----- From: Topband [mailto:[email protected]] On Behalf Of Grant Saviers Sent: Tuesday, August 3, 2021 6:47 PM To: [email protected] Subject: Re: Topband: Materials for Beverages? N7QT & I verified that black ring screw-in insulators are too conductive for one or two transmit radials on 160m. Lot's of arcs and smoke. I now use the yellow 4" long barb wire insulators screwed to trees to support 160m elevated Tx radials. Black may not be a problem with Beverage field strengths. Grant KZ1W On 8/3/2021 11:16, Tim Duffy wrote: > Two things concern me about black. UV and possible carbon used to color > black - which may be conductive at RF frequencies > > 73 > Tim K3LR > > -----Original Message----- > From: Topband [mailto:[email protected]] On > Behalf Of Drew Vonada-Smith > Sent: Tuesday, August 3, 2021 1:02 PM > To: [email protected] > Subject: Topband: Materials for Beverages? > > Gene, > > I have used those and others in that series with only fair results. They do > break more often than I'd like. I replace about 10% of them per year, which > is acceptable given that they are cheap. But I have not found anything > better. > > FYI - I'd be happy to use black ones, but have never seen them. My local > farm store carries the exact same bright yellow ones you listed. A link to > a "preferred type" would be welcome. I'm a bit of a birder and have not > heard of any hummingbird death issues. References? > > 73, > Drew K3PA > > ________________________________ > > > Toda > Date: Mon, 2 Aug 2021 16:35:47 -0400 > From: Gene Smar <[email protected]> > To: [email protected] > Subject: Topband: Fwd: [TowerTalk] Fwd: Amazon recommends "Zareba > ITY-Z Standard..." and more > Message-ID: <[email protected]> > Content-Type: text/plain; charset=utf-8; format=flowed > > FYI.? Materials for Beverages? > > 73 de > Gene Smar? 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