I recently ordered this from Cross Country Wireless and received this the other day.
There is a couple of reasons in no particular order:
- Release any front-end(pre-amp) from strong out of band signals, thereby avoiding possible IM from local FM broadcast etc.
- Avoid total blocking of 144Mhz while transmitting on 50Mhz
The Cross Country Wireless offers bandpass filters for 50, 70 and 144 Mhz. They handle 100W RF power and contain a built-in lightning surge arrestor as well. High voltage spike protection too; nice !
The bandpass filter comes with a filter test certificate, detailing RF and VSWR performance.
Final question: "will it result in more QSO's yes/no?"
Let's evaluate that in a few months.
For now I have to catch my next shift in the ARRL DX CW contest at our clubstation PI4TUE.
Have fun guys!