Re: [Repeater-Builder] C3I audio delay board

[scomind]

Hi Bruce,   > I have a C3I audio connected to a Cat 300dx. > As you increase the delay there a hiss that > is heard. If you turn the delay off, the hiss is > silent. Any Ideas?   That audio delay module uses two cascaded Reticon RD5108 bucket-brigade audio delay chips. Bucket-brigade technology has been obsolete for many years, replaced by better schemes.   The chips have a poor signal-to-noise ratio, and cascading them (for longer delay) makes it worse. That's why you hear the hiss. You can't do much about it.   Your board is a copy that C3I made of the original S-COM Audio Delay Module. Just as well; the S-COM Digital ADM that came later was a much better product. The design of the DADM is now owned by Integrated Control Systems, which also sells the DADM.   73, Bob     Bob Schmid, WA9FBO, Member S-COM, LLC PO Box 1546 LaPorte CO 80535-1546 970-416-6505 voice 970-419-3222 fax www.scomcontrollers.com YAHOO! GROUPS LINKS  Visit your group "Repeater-Builder" on the web.    To unsubscribe from this group, send an email to:  [EMAIL PROTECTED]    Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.