>I know I need class 1 NPO COG caps with 1 KVAR but a source for these
>eludes me. Most web locations have either no data sheets or data sheets
>that give little useful information.
>Where can I find the proper RF transmit caps. I have no room for doorknobs
>so ceramic is my only choice. I have located caps with NPO and COG rating
>at the proper Kv rating but no data sheet so they are a crap shoot.
You don't need NP0 temp coefficient. A ceramic RF cap rated for the
current and voltage is needed. The temp. coefficient can be N750 or
even N3300 if the cap can handle the current and v.
They are handling bypass current in the output pi network. A cap
rated for 2 amps or more at 1000 kc will be fine and not drift. I'd
look for 7.5 KV or higher.
By the way, doorknobs ARE ceramic caps. No idea what COG means.
Please explain.
73
Rob
K5UJ
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