Danny Richardson wrote:
After all, we
are talking common mode impedance here and the unit did show excellent
choking impedance at its resonate frequency (about 1.58MHz.). But had
a very narrow range. (dropping from over 6K @ 1.58 MHz. to less than
1K @ 3.5 MHz., 700-ohms @ 7 MHz, less than 300-ohms @ 14 MHZ and the
lowest was 130-ohms @ 30 MHz.

Did you also measure the phase angle for those readings?
--
73, Cecil, http://www.qsl.net/w5dxp