Hi guys,
I just got a UHF-DP-ARRAY-4/h antenna (Products) and plan on using it on a UHF DMR repeater. It will be side mounted on a large tower and I want to obtain the widest radius of radiation.
While the "Spacing from mast" is easy to calculate (1/2WL, 1/4WL and 3/8WL @ freq.), I am not sure about "Spacing between dipoles". On the PDF under the "TYPICAL RADIATION PATTERN" the spacing is given as 0.76 or 0.78WL. Searching for info about this type of array but different brands, I saw that the vertical spacing between dipoles is usually stated as 1WL so I'm confused, hence the following questions :
1 - Is the 0.78WL critical? If I get it wrong (.76 vs .78) it will affect the vertical beamwidth only?
2 - 3/8WL for "spacing from mast" vs 1/4WL will give me wider radius but sacrifice some gain?
3 - What about the mast? What should be the optimal distance from the tower?
Thank you!
Raz
I just got a UHF-DP-ARRAY-4/h antenna (Products) and plan on using it on a UHF DMR repeater. It will be side mounted on a large tower and I want to obtain the widest radius of radiation.
While the "Spacing from mast" is easy to calculate (1/2WL, 1/4WL and 3/8WL @ freq.), I am not sure about "Spacing between dipoles". On the PDF under the "TYPICAL RADIATION PATTERN" the spacing is given as 0.76 or 0.78WL. Searching for info about this type of array but different brands, I saw that the vertical spacing between dipoles is usually stated as 1WL so I'm confused, hence the following questions :
1 - Is the 0.78WL critical? If I get it wrong (.76 vs .78) it will affect the vertical beamwidth only?
2 - 3/8WL for "spacing from mast" vs 1/4WL will give me wider radius but sacrifice some gain?
3 - What about the mast? What should be the optimal distance from the tower?
Thank you!
Raz