Another reason NYC repeater owners moved to the "odd/even flipped" plan was to allow for use of existing tx combiners at premium commercial sites. If the ham repeater's tx frequency was in the 447- 450 range, an owner could use a site owner's combiner tuned for the 450-455 commercial band, thus assuring an excellent tx location on a tall tower. This was most evident on Long Island.
--- In Repeater-Builder@yahoogroups.com, "Jeff DePolo" <[EMAIL PROTECTED]> wrote: > > > From what I've been told, when 70cm first started to "take off" for FM > repeaters, repeater owners in the New York City metro found that they had > fewer issues with desense and overload if they flipped to a negative offset > (i.e. get the ham repeater Rx further away from the 450-455 commercial > repeater Tx's). By the time the coordination councils got on the ball, > there was a mish-mash of repeaters operating with either positive or > negative shift. As a "fix" (using that term loosely), they decided that all > of the "odd" pairs (44x.x25 and 44x.x75) would be negative shift and all of > the "even" (44x.x00 and 44x.x50) pairs would be positive shift. This became > the policy for the adjacent coordinators, and, like a bad cold, it spread up > and down the Atlantic coast from New England to Virginia as more 440 > repeaters came online. It's an ugly mess, and one that I"ve made noise > about fixing by having everyone go to positive offset to align with our > respective neighbors to the west and south. Most of the coordination > councils have been in agreement, but others remain opposed, so nothing has > changed yet... > > --- Jeff > > > > -----Original Message----- > > From: Repeater-Builder@yahoogroups.com > > [mailto:[EMAIL PROTECTED] On Behalf Of Bob Dengler > > Sent: Wednesday, September 19, 2007 1:19 PM > > To: Repeater-Builder@yahoogroups.com > > Subject: Re: [Repeater-Builder] UHF band opening > > > > Does anyone know why the New England bandplan has inverted 70 > > cm pairs > > every 25 kHz (unlike the rest of the country, which is either > > all + or all > > - 5 MHz)? 25 kHz isn't close enough for any adjacent channel > > issues to be > > a concern. > > > > Bob NO6B >
