In the February 1994 issue of MRT there was an article by Carl Ebinger of the Dade County Radio Shop who made some interesting claims about improving the performace of the SpectraTAC systems used by Dade Co. EMS. His article claimed that he could improve the performance of the SQM by the addition of $0.25 (1994$) in parts to each SQM. He described how there was too much voice getting into the noise detection circuitry which was causing falsing.
Unfortunately, when I tried to track the details down [circuit left out of article] I found that Carl was a Silent Key and, thus out of range. Talking to several others in the shop, including Susie and Joe Harper, did not lead me to the schematic of the modification. Carl had been working with TRN6091A SQMs so I am wondering if Motorola incorporated his improvements into later revision SQMs. Before I begin badgering the Dade County Radio Shop again I thought I would ask here if any of you were familiar with the article and Carl's work. He did say that he improved performance by removing JU-6 and installing JU-5 in the secondary line drivers of the three subcomparators. This shortened the Status Tone return delay from 550 msec to 90 msec which improved weak signal noise detector falsing at the master comparator. Thanks, Bruce WA6YLV KMJ335 Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/