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Kachina CAT 0.949b posted

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  • David Freese
    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
    Message 1 of 1 , Apr 18, 2006
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      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
      spreadsheet.

      Sample of NRAM antenna impedance dump:

      Antenna Impedance:
      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.

      Dave (hkj)
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