Hello guys,
Me and my fellow hams are preparing to build a repeater (2m & 70cm), solar powered, sharing the same site/tower. So far, we've acquired all but the antennas.
I found a few, but decided to go with the same guys that built our duplexers.
They list the antennas needed for our repeater here :
VHF - 136-174 MHz Dipole antennas D1 VHF, D2 VHF, D4 VHF, D8 VHF : Radial :
UHF - 400-490 MHz Dipole antennas D1 UHF, D2 UHF, D4 UHF, D8 UHF : Radial :
You can see the tower where we'll have to mount the antennas here :
Image - TinyPic - Free Image Hosting, Photo Sharing & Video Hosting
The antennas will be side-mounted.
My questions are :
1. What is the difference between OMNI vs. OFFSET for this antenna type?
I know you can modify the dipoles spacing and orientation to achieve different patterns, but is it something "common" for the exposed dipole antennas?
2. If we're going to point each dipole to a 90° difference, will the antenna work?
We need to cover all the area around the repeater.
3. Is there a problem if all dipoles (4 VHF + 4 UHF) will share the same pipe/mast?
Thank you and excuse my poor English. I'm from Europe.
Me and my fellow hams are preparing to build a repeater (2m & 70cm), solar powered, sharing the same site/tower. So far, we've acquired all but the antennas.
I found a few, but decided to go with the same guys that built our duplexers.
They list the antennas needed for our repeater here :
VHF - 136-174 MHz Dipole antennas D1 VHF, D2 VHF, D4 VHF, D8 VHF : Radial :
UHF - 400-490 MHz Dipole antennas D1 UHF, D2 UHF, D4 UHF, D8 UHF : Radial :
You can see the tower where we'll have to mount the antennas here :
Image - TinyPic - Free Image Hosting, Photo Sharing & Video Hosting
The antennas will be side-mounted.
My questions are :
1. What is the difference between OMNI vs. OFFSET for this antenna type?
I know you can modify the dipoles spacing and orientation to achieve different patterns, but is it something "common" for the exposed dipole antennas?
2. If we're going to point each dipole to a 90° difference, will the antenna work?
We need to cover all the area around the repeater.
3. Is there a problem if all dipoles (4 VHF + 4 UHF) will share the same pipe/mast?
Thank you and excuse my poor English. I'm from Europe.