>
>We often scrounge up components of uncertain pedigree -- you don't see
>many spec. sheets at ham fests. A lot of manufacturers haven't yet gotten
>with the program and put their data sheets on the web where we can find
>them, and I doubt any ever will for parts they don't make anymore. It
>always makes me nervous to use something when I don't have a pretty good
>guess as to the specs. I really hate the smell of smoke, and I don't like
>explosions (except intentional ones).
>
>Do you have any handy rules of thumb to estimate RF capabilities of
>components? For instance, disk ceramic capacitors,
? RF current capacity varies with frequency. I resonate the capacitor
with a roller coil, place it in parallel with a 50 ohm termination,
connect an oscilloscope across it to measure V, and crank up the
amplifier. Current must be calculated from the measured V on the 'scope,
and the reactance in ohms of the cap. Most 3kV to 10kV disc ceramic caps
exhibit noticable heating at 1A-rms. // Doorknob type caps are often RF
current rated by the mfg.
>...
- later, Carl.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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