I am usinga Motorola R2670 to look at the spectrum. I can see this at the RX port on the duplexer. Note that when I plug thing directly into the service monitor or replace the antenna with a dummy load there is no issue with the transmitter or receiver so it is definatly an external event. I also noted yesterday that this seems to be a series of 5 spurs right at 200K apart going down in frequency (no high side probably due to the reject side of the cavities). They are equal in strength at about -80dB. I have no other emmitters in the neighborhood I am aware of so this is strange. I am suspecting it could be related to the many megawatts of hdtv transmitters on the montain about 4 air miles away so I am going to try a DCI filter to eliminate any out of band signals from reaching the repeater today. I have an isolator on the way next week also so at least the repeater will be well filtered and protected from generating IM itself.
--- In [email protected], Eric Lemmon <[EMAIL PROTECTED]> wrote: > Andy, > > When you say you "see" this carrier, how are you viewing it? That is, are > you watching a spectrum analyzer with a pickup antenna, while the repeater > antenna is connected to the duplexer? Is this mystery carrier present all > the time, even when the Quantar is not repeating? > > All of my Quantar service manuals are at my office, so I can't study the > possible leakages from the repeater until Tuesday, but I wonder if this > mystery carrier is leaking out of the repeater itself. Are ALL shields in > place and secured with every screw required? Are all components of your > repeater grounded to a known-good station ground? > > Finally, how much desense are you experiencing, and how are you measuring > it? > > 73, Eric Lemmon WB6FLY > 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/
