Hello- I am a little confused about the UV and electrical properties of the polyamide insulator clamps (hydraulic and tubing line support clamps) used on the VHF LFA yagis. I have viewed commercia
I think the important point is the material they are made of. As far as I know, PVC is good for that, since it is UV, electricity and moisture resistant. But if your concern is the UV resistance, tha
My 40m OptiBeams use black clamps, I am not sure of the manufacture but they look like Stauff clamps. I wonder who is saying that the black clamps have a carbon issue? Can you buy one and test it? Jo
John KK9A There are so many black colored plastics of so many different bulk resistivities and/or RF properties, you'd have to measure one to find out. It is true that some black plastic uses carbon
Throw one in the microwave and see if it gets hot. Dino - KX6D ________________________________ From: TowerTalk <towertalk-bounces@contesting.com> on behalf of john@kk9a.com <john@kk9a.com> Sent: Thu
A good test, strictly at 2.45 GHz, and, the clamp is the only load in existence, relative to the RF source. Test at actual operating frequency, conditions (antenna, frequency, atmosphere, relative ph
I remember convincing myself that Stauff black polyamide (PA) clamps were ok when I constructed my 40M yagi. I dug up the data again to refresh my memory. This is probably more than anyone wants to k
John, Excellent data! Which I have found very difficult to find. Could you publish links or references to the sources you found useful? Grant KZ1W First, regarding W5FH's question, the green clamps a
References for the polyamide data: 1. dielectric constant and volume resistivity: see http://www.rfcafe.com/references/electrical/dielectric-constants-strengths.h tm, and https://www.professionalplas