Ian, The CTCSS tones are derived from the timing of ASIC IC107, and are independent of the carrier frequency control circuit. Use your service monitor to "sniff" around the CPU to see if the clock is running at or very close to 8.2944 MHz. If it is way off, you'll need to replace the X1 crystal, since there is no adjustment. Crystal X1 is type HC-184, part number 260-862-6Z.
73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kerinvale Sent: Saturday, October 17, 2009 2:36 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Maxon sm4450sc Hi guys .Has anyone come across the ctcss frequency being a little off frequency on a maxon sm4450 I.e. For 123 Hz the radio produces 122.5hz or below is there anyway to make the radio produce the exact programmed Hz Thank You, Ian Wells
