Back in the day, a channel was 30 kHz wide. When they were split to meet demand, California was not the only coordination jurisdiction which chose to put the "half channels" upside down. From what I gather from the old-timers, it was easier to protect your input from a single, consistent signal, (the other repeater's output,) 15 kHz off your input but far away, than it was to deal with an ever-changing pool of users who could be right under your site, trying to work the distant repeater with high power and frequency tolerance inferior to the distant repeater.
California had to be first in finding solutions to many band-crowding issues. Maybe hams there will be the first to narrow-band? 73, Paul, AE4KR ------ Original Message ------ Received: Wed, 25 Mar 2009 02:21:03 PM PDT From: "Nate Duehr" <[email protected]> To: <[email protected]> Subject: RE: [Repeater-Builder] Thank You - Interference Help - WTB > Why is their output 15 KHz away from your input? Is someone upside-down? > > Sounds like a bad coordination... even 100 miles away, if one or both ends > are on high sites.
