Someone found this awesome site:
http://hamwaves.com/antennas/inductance.htmlI entered in
D
= 0.64mm for 22ga wire Mean diameter of the air core coil, measured from wire centre to wire centre
N
= 5
Number of turns
?
= 45 mm
Length of the coil, measured from the connecting wires centre to centre
d
= 4 mm
Wire or tubing diameter
455mhz design freq.
Calculator says: 0.00003348976658323965uH
Frequency-independent series inductance from the current-sheet coil geometrical formula, corrected for field non-uniformity and round wire[2,4-7]
was blank for
Effective series inductance at design frequency from Corum & Corum's sheath helix waveguide formula, corrected for field non-uniformity and round wire[1,2,4-7]
That's 0.03348nH?
Seems too low
That's for NTE red coated magnate wire. Is there a chart for air core inductors?