The duplexer is flat and black. I've found no references to the part number on the web. It seems to tune ok to 444.3/449.3. Seems to have about 2db insertion loss and 55db notch. I used a Tek 7L12 spectrum analyzer, a Boonton 42 power meter, a HP 8640B as the signal source. Seems as though everything should have been terminated ok.
The transmit radio is putting out about 35 watts. Currently there is no shielding between the radios. That is something that I will try next. I am using RG-142 as cabling. Thanks for the pointers. --- In [email protected], "skipp025" <[EMAIL PROTECTED]> wrote: > > Re: GM300 Repeater with Harris Duplexer > > Depends on which Harris Mobile Duplexer you're using. One version > is almost plug and play into the ham bands while another is not > such a great performer when used below say... 452MHz. > > Are you using the Black Celwave Flat-pack or the more square grey > (older) type duplexer? > > Also depends on how you adjusted the duplexer? > > What's the power level from the GM300 radios? > > In an ideal world... you shouldn't notice a lot of difference in > the required rx level with the tx on or off. > > s. > > > "Jeff Kashinsky" <w2ua@> wrote: > > I am building a 440 portable repeater out of a pair of GM300 radios > > and a Harris Alpha mobile duplexer. > > I believe that I tuned the duplexer properly and it notches the > > xmit signal by about 55db on the receive side. > > Using my signal generator as a source, it takes about 10db more > > signal to key the contoller with the transmitter on than with > > it off. > > I am wondering if this is normal or if I have more work to do. > > Thanks in advance for your input. > > Jeff > > W2UA > > >
