How does a multi-channel system work?

[talviar]

I have never seen down tilt in 2 way, is it used much? Is it more driven by coverage for rolling hills and terrain issues or to reduce co-channel RFI to a distant system?

Despite what many folks believe---- coverage going on forever till the atmosphere attenuates it isn't always a good idea.

the downtilt helps the signal get to where it needs to rather than wasting the signal into beyond the desired coverage area
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[speedway_navigator]

2 way has always been a 'blast and pray' coverage method and until cellular showed up that method was accepted as gospel.
One county I worked with had a repeater about mid line between north and south with all 8 dipole elements pointed north with complaints of poor coverage to the south.

 

[kayn1n32008]

2 way has always been a 'blast and pray' coverage method and until cellular showed up that method was accepted as gospel.
One county I worked with had a repeater about mid line between north and south with all 8 dipole elements pointed north with complaints of poor coverage to the south.

Probably side mounted, with no standoffs.

 

[KevinC]

2 way has always been a 'blast and pray' coverage method and until cellular showed up that method was accepted as gospel.
One county I worked with had a repeater about mid line between north and south with all 8 dipole elements pointed north with complaints of poor coverage to the south.

This probably wasn't your case, but on the Texas/Mexico border this is common on VHF to keep as much of the signal as possible out of Mexico.

 

[speedway_navigator]

This probably wasn't your case, but on the Texas/Mexico border this is common on VHF to keep as much of the signal as possible out of Mexico.

We had lots of that in San Diego where I got my start in 2 way. I worked for a home builder who used Nextel at the time, crappy coverage near TJ due to the border. This antenna was east and 30 miles south of Dallas.