Gary- This is going to sound a little simple-ish, but have you disconnected the receive antenna to see if the noise is still there with no antenna? This will instantly indicate whether the signal is strong enough to be coming directly into/overloading the receiver front end. If it goes away when you pull the antenna off the receiver, then you can apply the techniques others have suggested (DF, filters, etc.). If it DOES NOT go away when you disconnect the RX antenna, then you have something seriously strong getting directly into the receiver front end (or a defective receiver stage). - Mark WB2ULR
> -----Original Message----- > From: [email protected] > [mailto:[EMAIL PROTECTED] On Behalf Of Gary > Sent: Thursday, May 25, 2006 1:48 PM > To: [email protected] > Subject: [Repeater-Builder] White Noise on Two Meters..... > > I have an interesting thing happening on our two meter repeater. We > have what appears to be a blanking white noise that is present on the > input. The repeater is a split site system with a 440 link from the > two meter receiver site over to the transmitter site about 2000ft > away. There are no duplexers in the system to cause problems. > > The link on 440 is clean of any noise, so we are quite confident the > link is not a problem. > > On two meters, when a signal is anything less than full quieting, we > get a white noise that will almost mask the audio. We have tried > different receivers such as the GE MVS and now a GE Master II. We > have removed the preamplifier with minimal results. The receivers > have excellent sensitivity and the tuning process of the receivers is > correct. We have also tried putting pass cavities ahead of the > receiver with no appreciable change. The antenna is a DB-224 mounted > on a broadcast tower just below the bays of an FM broadcast > commercial transmitter. We have turned OFF the fm broadcast > transmitter at times to check if perhaps this was the problem but no > change was noted. > > ANY IDEAS from anyone??? > > THANKS! > Gary - W5GNB > > > > > > > > > > > > > > > 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/
