Ken:

You haven't constructed a trap. A trap is a parallel resonant circuit,
meaning the inductance and capacitance are in parallel with each other. At
resonance it presents a high impedance. A trap can be constructed with
coaxial cable, but to get the inductance and capacitance in parallel you
have to cross connect the inner and outer conductors. See:
http://www3.sympatico.ca/wrgraham/ve...coaxtraps.html

You have wound the coax into a choke inductor but the capacitance you
calculated is between the inner and outer conductors and is not in parallel
with the inductance of the windings.

If your calculation of the inductance is correct (2.342 uh), by itself it
doesn't have a very high impedance at 10 mhz and doesn't serve very well as
a choke. It may be doing more harm than good since a resonant dipole should
have better than a 3:1 SWR. Have you tried the dipole without it?

Roger K6XQ