Don't be too sure about that. Once the am station signal gets into the receiver it can go anywhere and cause havoc. It could be getting into the IF or the mixer once picked up by cables.
73 Gary K4FMX > -----Original Message----- > From: Repeater-Builder@yahoogroups.com [mailto:Repeater- > buil...@yahoogroups.com] On Behalf Of KT9AC > Sent: Wednesday, February 24, 2010 4:42 PM > To: Repeater-Builder@yahoogroups.com > Subject: Re: [Repeater-Builder] Re: Can the 4th harmonic of 1250 AM keep > UHF repeaters locked up? > > If it was just audio then there would be no feedback of the PL/DPL > tones, keeping the repeater locked up. > > Good advice though. > > Jeff DePolo wrote: > > > > > > > > On 2/23/2010 3:11 PM, Jim WB5OXQ inb Waco, TX wrote: > > > > Is it possible the AM signal is getting into an audio stage > > > instead of the > > > > receiver front end? I had that happen once. > > > > > > > Same here. All audio inteconnects are now tiny coax cables at > > > that site > > > now, installed with shield grounded at ONE end... > > > > > > Nate WY0X > > > > At AM broadcast sites or studios co-located with the transmitter, > > hard-grounding the shield at one end and RF-coupling the shield at the > > other > > end to the equipment ground via caps (0.01 uF as a rule of thumb) is > often > > the most effective technique in many situations. > > > > --- Jeff WN3A > > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
