parnass@ihu1h.UUCP (Bob Parnass, AJ9S) (09/25/84)
Having replaced my ICOM R70 receiver with an R71A, I am interested in learning what modifications other owners have made to their R71A's. As a contribution, I shall relate my own failed experiment. I replaced a 220K resistor on the logic board with a 47K resistor and sped up the scan rate. At this higher speed, however, the memory scan became useless, because when a sig- nal was detected on a channel, the receiver didn't stop scanning until the next channel. In the SSB/CW/AM modes, the squelch is AGC driven, so I assume that this behavior is due to the finite AGC attack time. The logic board in the R71A may be used in other ICOM pro- ducts, because there are holes for another IC, another con- nector, and several other components. Maybe there are some "undocumented features" waiting to be discovered. My R71A's noise blanker seems more effective than the one in my R70. I've also got the infrared remote control, speech synthesizer, and FM board. Anyone have any mods? -- =============================================================================== Bob Parnass, Bell Telephone Laboratories - ihnp4!ihu1h!parnass - (312)979-5414