Well, I took the cable apart, re-did the connection with the resistors, and this time managed to use shrink wrap, by routing the resistors differently. Still a tight fit, but everything looks much tidier. The P7100 initially showed NO KEY BANK and then booted up to the HOME system. I then realized that I had not assigned any key banks in RPM, which oddly enough, I thought only applied to ProVoice private operation. All other encryption settings for P25C operation had been configured.
Once I did reprogrammed the radio, it then showed KEY LOAD BANK 1. However, key loader software can not talk to the P7100 and load any keys. The radio never displays KEY IDLE and the key loader software just times out saying that it can't connect to the radio. I can still re-load keys into a P7200, so the cable works, but now that the cable is converted to a key load cable, I can no longer program the P7200. It powers up, then goes into self test, and then just goes into an endless power up boot loop. There is no 3 finger button press, to go into programming mode, sequence for these. You have to have the "proper" configured programming cable.
The help section mentions that the key loader software won't work with the older I/Q series P7100's, that run on "G" series DSP code. Being that this was an engineering prototype, it's an older FM series P7100, but it has all features enabled and is loaded with the later "F9" series DSP code.In fact, it is now currently loaded with the latest F9R06N05 DSP code. I did notice when the KEY LOAD BANK 1 is displayed, on the radio screen, the operating mode indicates "A" for analog, for some reason, even though the radio is programmed to power up on a P25 conventional channel.
If anyone has any suggestions or ideas, let me know. Otherwise I'm going to remove the resistors, re-connect pins E8 and E10 with a jumper, and return it back to a proper working programming cable.
