Sensitivity is cheap... A 30 cent FET will give you all the sensitivity your ears can handle... Selectivity, stability, accuracy, intercept levels, harmonic rejection, IF rejection, audio fidelity , are expensive... Denny -- FAQ on WWW: http://www.contesting.com/FAQ/tentec Submissions: tentec@contesting.com Administrative requests: tentec-REQUEST@contesting.com Problems: owner-tentec@contesting.com