Kachina CAT 0.949b posted
- No you did not miss 0.948 ... it was not posted.
Did some reverse engineering of the antenna auto tuner. The NRAM data
dialog now shows the C & L values for the L-network. The rho / phase
angle is displayed if the rig gives that value instead.
I've included an Excel spreadsheet which performs the same
calculations as a Smith Chart. You can convert the L-C values to the
impedance values at the transceiver coaxial connector using this
Sample of NRAM antenna impedance dump:
3574219 A CL 160 pF L, 3.4 uH #1
7001953 A CL 82 pF L, 1.9 uH
7031250 A CL 39 pF L, 1.9 uH
7060547 A CL 39 pF L, 1.9 uH
7089844 A CL 0 pF S, 2.1 uH
7119141 A CL 0 pF S, 2.4 uH
7148438 A CL 0 pF S, 2.4 uH
7177734 A CL 39 pF S, 2.4 uH #2
7207031 A CL 0 pF S, 2.2 uH
7236328 A rp 0.543 rho, 243 phi
Line #1 reads 3.574219 MHz, Antenna Port A, C-L values as shown. The
L indicates that the shunt capacitor is at the Load end of the
L-network. The antenna load looks like 89.5 -j83.1 ohms.
Line #2 reads 7.177734 MHz, Antenna Port A, L-L values as shown. The
S indicates that the shunt capacitor is at the Source end of the
L-network. The antenna load looks like 49.6 - j103.9 ohms.