Did you check if your spectrum analyzer to see if its being overloaded, some spectrum analyzers don't handle strong signals too well? Do you have an isolator and a bandpass cavity on your transmitter? Did this interference just started? Does this interference just happens when the Nuc is in the digital mode or analog? Did you do an intermod study?
The Last thing I would do is complain to the Fcc and if you do you better be prepared . Those Motorola Nucs stations are usually pretty clean with a bandpass cavity in line. Be careful how you handle this at the end guess who might be asked to leave the site. Fred ----- Original Message ----- From: "Coy Hilton" <[EMAIL PROTECTED]> To: <Repeater-Builder@yahoogroups.com> Sent: Tuesday, August 10, 2004 7:51 PM Subject: [Repeater-Builder] Re: Motorola Nucleus II 900 mhz > AS stated in one of my posts, it's 144.510 MHZ. the remainder of the > equipment used to assist with eliminating this problem is as > follows. a Wacom WP641 duplexer, BpBr With an Additional BAnd Pass > cavity tuned to my receive frequency, also a Notch filter, a 5 pole > Helical front end feeding a MASTRII receiver with additional 5 poles > Helical filtration. Please read the following carefully and slowly. > THE INTERFERANCE IS ON THE RECEIVER FREQUENCY...I CAN SEE IT ON THE > SPECTRUM ANALYZER and AT LEAST ONE OTHER PLACE ON THE BAND AT > 154.490, BROAD BAND, AND 20 KHZ WIDE. > > This problem has to be solved at the source not band aided by me > trying to put every kind of filter known to man on my receiver. The > only way that I can solve it, is to move to another site or turn my > receiver off. What I need to know is has anyone had this problem > with this Transmitter and a little about the transmitter like normal > configuration. > > Oh, Motorola told me that They didn't build this model > transmitter. " It was built by Nucleus Inc a third party company in > Texas" > > It's difficult to get 40 feet vertical seperation on top of a > building. > > 73 > AC0Y > > --- In Repeater-Builder@yahoogroups.com, Mr John Lloyd <[EMAIL PROTECTED]> > wrote: > > Coy, > > > > You did not say anything about what receiver frequency > > you are using that is getting hit by the 900 mhz > > transmitter. Do you have a bandpass cavity on your > > receiver? If you are using a BpBr type of duplexer, > > then it has almost no rejection to the 900 Mhz signal. > > You will need a bandpass cavity on your receiver. > > > > Most 900 Mhz paging transmitters have an output power > > of 300-500 watts. You will need vertical separation > > between your antennas and bandpass cavities to solve > > this. > > > > The 25 Ft separation is next to nothing if it is > > horizontal. You will need at least 40 Ft of vertical > > separation between your antennas. > > > > John, K7JL > > > > > > > > Message: 9 > > Date: Mon, 09 Aug 2004 22:15:52 -0000 > > From: "Coy Hilton" <[EMAIL PROTECTED]> > > Subject: Motorola Nucleus II 900 mhz > > > > Does any one have any info on the possible problems > > with noisy > > Motorola Nucleus II 900 mhz transmitters? A paging > > company coo- > > locatde at the site with my repeater has one that's > > driving me up > > the wall. I have been working with them for 3 months > > now, to get it > > fixed. They recently changed antennas to one located > > about 25 feet > > away but there are spurs on my input frequency but, > > that did a lot > > of good. NOT. I'm about ready to fax Riley H. at the > > FCC. I'm trying > > to be a good neighbor but I've about had it > > 73 > > AC0Y > > > > > > > > > > > > __________________________________ > > Do you Yahoo!? > > Yahoo! Mail Address AutoComplete - You start. We finish. > > http://promotions.yahoo.com/new_mail > > > > > > > Yahoo! Groups Links > > > > > 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/
