On 9/24/2013 6:05 PM, Tom W8JI wrote:
They were supposed to be non-inductive carbon, but need to find
something better like carbon film.
Any resistor except a big wire wound is "non-inductive" on a low
frequency like 160.
What you want is a composition type resistor, either metal or carbon,
to handle surges without changing value.
The last thing you want is a film resistor, which is what you probably
have right now. Carbon films or metal films increase in value after
short duration high energy surges, because the surge blows part of the
film layer away.
Bruce,
If you have any trouble finding the carbon composition resistors that
Tom is recommending, Ohmite's OX/OY Series "Ceramic Composition"
resistors are surge rated and readily available from various electronics
distributors (i.e. Mouser, Digi-Key, etc):
www.ohmite.com/cat/res_ox_oy.pdf
73, Mike W4EF..........
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Topband Reflector
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