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? on neon light as static discharge device
"Highland Ham" wrote in message ... Dave wrote: I saw somewhere that you could use an NE-2 bulb between the antenna "hot" lead and ground as a static discharge device for a receiver, but can't find an NE-2 and don't know anything about neon bulbs. Anybody know if a standard neon bulb rated at 125 VAC could be used in this manner? Or how I could test it? I'm thinking about charging up a 50V electrolytic capacitor and hitting the bulb with that, to see if it discharges the cap. I have a ..22uF 630V mylar cap between the antenna and the input to the tuner because the 35V disc I had there got blown, so I know that static can be a problem with my setup even though it is grounded at two points. Would welcome any ideas anyone has on how to make this work... ============================================ To avoid building-up of static you can fit a say 47 Kilo Ohms non-inductive resistor between what you call the 'hot' lead and earth. This would not affect the received or transmitted signal. I have fitted 2 non-inductive (carbon) 1 Watt resistors (47 KOhms) from the incoming balanced feeder to earth at the Antenna Matching Unit. This approach is obviously also OK with an incoming coax feeder. At 100 W RF output the voltage would be 71 V at the transceiver. This would dissipate a little over 0.1 Watt in the 47K resistor fitted at the transceiver. Metal-oxyde resistors can for this purpose also be considered as non-inductive. Frank GM0CSZ / KN6WH Thanks for the input, Frank. I believe this, or something like it, is what I am going to have to do. I've already got the bulb installed in the receiver case, and I guess I'll leave it there to warn me of impending doom, but the resistor idea is what will probably save my bacon. Is a metal-oxide resistor the same thing as a metal-film resistor? Or would that be inductive and mess with my incoming signal? Thanks much, Dave |
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