Tim, Please confirm that you measured the sensitivity as 0.72 millivolts, or 720 uV- about 2400 times worse than the 0.3 uV you expect. Such a huge disparity points to a failed transistor or a shorted capacitor on the receive board. Perhaps your next step is to perform voltage checks and compare your readings to those in the manual.
73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tim Sawyer Sent: Monday, September 06, 2010 10:11 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Micor UHF Sensivity I have a Micor base that was manufactured in the ham band. Model is C64RXB3196A-SP71. The receiver model number is TRE1241A-SP10 (420-450 Mhz). It came with 4 channels all tuned up and on frequency in the ham band. But the receiver is sensitivity is .72 mv for 20 db quieting on the best channel and .9 on the worst. I went through the alignment procedure and could not make any improvement. Obviously this is not meeting the .5 spec and I was expecting more like .3 or so. So my questions is what should I do to troubleshoot this? Is there some common Micor receiver failure parts or areas that I should be looking into? -- Tim :wq
