"co channel user spacing for narrow band channels" - I just Googled for this and found nothing
Does anyone know what the spacing rules will be for "co channel" and "adjacent channel" users after narrowbanding?
AFAIK - the legacy VHF high band systems - which were using channel centers that were .015 Mhz apart (ie 154.31, 154.325, 154,34, etc) - had spacing requirements of approx 20 or 30 miles for co channel users - and 5 to 8 miles for adjacent channel users. (But Everett MA FD used to have a full power repeater on 154.31, and the adjacent Chelsea FD had a full power repeater on 154.325, and they never seemed to interfere with each other).
Does anyone know what the spacing rules will be for "co channel" and "adjacent channel" users after narrowbanding?
AFAIK - the legacy VHF high band systems - which were using channel centers that were .015 Mhz apart (ie 154.31, 154.325, 154,34, etc) - had spacing requirements of approx 20 or 30 miles for co channel users - and 5 to 8 miles for adjacent channel users. (But Everett MA FD used to have a full power repeater on 154.31, and the adjacent Chelsea FD had a full power repeater on 154.325, and they never seemed to interfere with each other).