I do it all the time in a test jig to set up mobile vehicle repeaters. Helps protect the non power term ports of a Service Monitor.
You'd be surprised how much you can hear through it... s. > "Paul Plack" <pl...@...> wrote: > Can you receive through a Circulator without heavy > losses? I've never tried it... > ----- Original Message ----- > From: David > To: Repeater-Builder@yahoogroups.com > Sent: Monday, November 02, 2009 1:31 PM > Subject: [Repeater-Builder] Re: Weird Interference between APRS and 2-M > repeater help needed > > > First of all you do not have enough isolation between antennas with only > two wavelenghts horizonal seperation. A single bandpass cavity will not be > enough. I would try 2 bandpass/bandreject cavities. Reject set for the TX > freq and the other set for the RX freq. I believe that RF from your repeater > is exciting the RF amp in your aprs tranceiver, see if the problem is still > present with the aprs hooked up to the antenna but with your power supply > disconnected. Most people used a simple mobile for aprs which creates alot of > headaches where several transmitters are used. They just dont have the > filtering needed for this application. You should also use a circulator on > your aprs radio. This will help keep RF out of your aprs transmitter. > > David Epley, N9CZV > Winchester, In > > > . >
