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On Jun 13, 5:26*am, "Brian Gregory [UK]" wrote:
"BDK" wrote in message ... Never heard of such a thing. I use insulators at each end, and in the old days I used a neon bulb or a 12V tail light bulb as a bleed off. I went to gas discharge tube arrestors a long time ago. The 12V bulb made a really nice light show on winter days when the wind was really going. What kind of buld exactly is a "12V tail light bulb"? -- Brian Gregory. (In the UK) To email me remove the letter vee. The 12 VDC Auto Tail Light Bulb has a Tungsten Element which is a relatively High Resistance and functions as a constant {always-on} bleed resister to drain any static electricity before it could build-up. Cheaper that a Resister and the Mini-Coils of the Tungsten Element was way far beyond the HF Band so it only functioned as a Resister and not a Coil {Inductor} when used with a SWL [HF] Antenna. ~ RHF Never saw one of these 12 VDC Tail Light Bulbs 'glow' because they were constantly bleeding-off the Static Electricity before it had a chance to build-up -but- using a Neon NE-2 Bulb will 'glow' if the Static Electricity does build-up to trigger it. That is why using an NE-2 Neon Bulb by itself is not recommended since it is designed to Fire only after the Static is already built-up. Using a NE-2 Neon Bulb with a Bleed Resister is often done with the idea that the NE-2 is an Overload 'fail-safe' should the Bleed Resister fail of there is a not to distant Lightning Strike. If you are already using a Matching Transformer Balun/Unun with your SWL Antenna the the Bleed Resister generally is not needed or required. ~ RHF |
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