"Bryan" wrote in
:

Rick wrote:

Anybody know where I can get some halfways reasonably priced
capacitors for making traps?

I don't need much power capability - 100 watts max.

I looked on rfparts.com and WOW, are they proud of them... can't find
a'one that's suitable for under about 15 bucks EACH ...

Hi Rick,

A stub of coaxial cable will work... approximately 30pF/foot for 50
ohm types... approximately 20pF/foot for 75 ohm types. Aside from the
low cost, the spiffy thing about using a coax stub is that, with a
pair of wire cutters, it makes the trap easily tunable.
....

Something to keep in mind is that a short open circuit stub of small coax
is a relatively lossy capacitor, and a lower loss capacitor can be made
by cutting the cable in two and paralleling the two pieces.

For example, 2m of RG58C/U has a reactance of about 68 ohms at 10MHz, and
a Q of only 135. 2 parallel pieces of 1.1m length has the same reactance,
but double the Q, but still nowhere near the Q you expect of those
doorknobs.

Owen