From cbfsb!att!linac!uwm.edu!cs.utexas.edu!swrinde!gatech!ukma!aunro!ve6mgs!mark Sat Nov 9 16:10:40 EST 1991 Article: 10188 of rec.radio.amateur.misc Path: cbfsb!att!linac!uwm.edu!cs.utexas.edu!swrinde!gatech!ukma!aunro!ve6mgs!mark From: mark@ve6mgs.uucp (Mark G. Salyzyn VE6MGS) Newsgroups: rec.radio.amateur.misc Subject: IC-751 Switch Matrix Message-ID: <1991Nov8.064843.1771@ve6mgs.uucp> Date: 8 Nov 91 06:48:43 GMT Organization: Amateur Packet Radio E-mail Gateway VE6MGS Lines: 44 This following chart was generated by shorting out the matrix points and watching the function that is performed. Some are intuitive already from the schematic. There are only a couple of `extra' functions in the matrix (ie, USB and LSB, Reset 100&10 Hz [The TS switch does this as well]). The KEY? GENE switches (Y0) are accessed by the RC-10 controller, but I noticed that some `removed' circuitry in the rig was designed to switch the digit switches on the RC-10 controller to the KEY? HAM array (Y3), effectively making the switches directly access each band. However, the removed circuitry (a set of switching transistors) is replaced by a solid jumper to Y0 :-(. The `empty' slots in the following table showed no perceivable function. The Y5 matrix, acted like it was shorting some other behavior out causing the rig to switch to the specific memory channels (you can observe a binary + 1 selecting behavior) temporarily. Have fun, Ciao, 73 de VE6MGS/Mark -sk- IC-751A Switch Matrix (W/ Function) DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 _________________________________________________________________ | KEY0 | KEY1 | KEY2 | KEY3 | | | | | Y0 | GENE | GENE | GENE | GENE | SCAN | | | | |_______|_______|_______|_______|_______|_______|_______|_______| | MHZ/ | MHZ/ | | | VFO | VFO/ | HAM/ |Disable| Y1 | BAND | BAND | | | A/B |Memory | GENE |RIT/XIT| |__Up___|_Down__|_______|_______|_______|_______|_______|_______| | | | | Clear | A=B | | | | Y2 | FUNC | | |RIT/XIT| (B=A) | |MWrite |M->VFO | |_______|_______|_______|(->VFO)|_______|_______|_______|_______| | KEY0 | KEY1 | KEY2 | KEY3 | | | | | Y3 | HAM | HAM | HAM | HAM | | | | | |__BAND_|__BAND_|__BAND_|__BAND_|_______|_______|_______|_______| | | | AM | CW | RTTY | SSB | | | Y4 | LSB | USB | (FM) | (NAR) | (NAR) | (REV) | FM | LSB | |_______|_______|_______|_______|_______|_______|_______|_______| | M2 | M3 | M5 | M9 | M17 | M33 | M65 | M29 |