> Question on this: I have a 151/159 split on my freqs that > I am working with, can a mobile duplexer be used for this > and still work well?
re: above question: Yes the proper mobile duplexer can be used and should work OK, but not with the same performance as a typical higher-Q (larger size) fixed station duplexer. > > A mobile (notch) duplexer will not work at a 600 kHz > > split. Even a 3 or 4 MHz split results in unacceptable > > performance. By mobile we "assume" you mean the more common reduced size duplexer assemblies. I have seen and own specialized version reduced size duplexers working on very narrow splits. I have also modified some of the more common notch pass duplexers for more narrow operation... but it was not easy, nor much fun or practical for the average Joe. > > but I had to use a Celwave 5085-1 duplexer to make it work. > > The 5085 duplexer is about twice the size of a mobile notch > > duplexer, and it is intended for splits as narrow as 3 MHz. Yep, and there are assemblies that do even more narrow splits... just a question of what you feel is acceptable performance. cheers, s.
