I agree,they arent the best delay solution. We were never happy with their performance,audio sounded phase distorted and limited response. They were replaced with Glenayre's with digital delay cards that worked much better. Old technology vs new... 73,Lee,N3APP
----- Original Message ----- From: "Jeff DePolo WN3A" <[EMAIL PROTECTED]> Subject: RE: [Repeater-Builder] Re: Micor Delay Line > > Worked very well as long as the microwave > > hops to the site didn't have too much > > group delay. > > Those Allen Avionics analog delay lines have horrible group delay, > distortion/ringing, and frequency response abberations. I've put them on my > HP 8903 audio analyzer and decided they weren't going to be worthwhile for > my simulcast repeater project. You can tweak their performance them to some > degree by tailoring both the source and load Z depending on the delay > setting but I never found a combination that I was thrilled with. I've got > several GE Delta-S radios on the air as exciters that I modified for use > with an external GPS reference oscillator. Right now they're on the air as > a "sloppycast" system with no audio delay correction. Someday when I have > more time (yeah, right) I want to work on a digital delay solution. For > now, lacking audio delay, the repeaters that are being sloppycasted are far > enough apart that the distortion in areas where there is a little overlap is > noticible but not unbearable. > > How well did the voice simulcast system work with the AA delay lines? How > bad was the audio in the areas with common coverage? I've heard voice > paging on Micor PURC simulcast systems and always though it sounded > horrible... > > --- Jeff > > --------- > Jeff DePolo WN3A > Broadcast and Communications Consultant 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/
