Tim,
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You need the high power programming cable to do a high power Spectra or Astro Spectra which has a 25 pin connector - the 15 pin connector that the low power programming cable uses does not exist on the high power versions.
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Astro Tuner is used to align the Radio, while Astro Spectra CPS is used to program the radio - I use V5.03, so 5.04 should do it as well.
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Good luck - Kurt
