I’m working on a project an I would like to have an advise concerning the minimum distance between omnidirectional antennas. I’m planning to use the Netmetal 5 at 5875MHz and une 5.5dBi omnidirectional antennas. It will be for a Mobile application so I must use a maximum of 6dBi antenna to stay legal (Point to Multipoint application).
I would like to keep the minimum distance between antennas to keep the maximum spacial correlation between each channel and have a compact design. I have seen that the rule of thumbs recommend at least half the wave length between antennas. The netmetal 5 triple channels have approximately this distance (28mm between connector, 5875MHz = 50,7mm adn half of it is 25mm). Connecting antennas directly on the Netmetal 5 should give me the most compact possible design on a nice enclosure. Somebody have any recommendation about minimal distances and if this is a good idea to connect omnidirectional antennas directly on the Netmetal 5?
Don’t know anything about spacing but you stay legal even with bigger antennas, just use regulatory domain option with your country and put real antenna gain. The transmission power will be set automatically according your local regulations.
I didn’t know this feature. This is really nice! Unfortunately, since I have a Point to Multipoint (PtM), the regulation are really different than Point to Point (PtP) for fcc compliancy and I doubt that this features take in account a PtM or PtP. My guest will be that it is for PtP only.
No matter the distance. Both antennas are mounted on the same equipment so they will work synchronously. And there will be not interference between them.
I am not expert on canadian fcc rules, but you can check the real power at current tx power tab. If it is over the limits you can adjust the value of antenna gain. Or you can set the values manually as you wish. So again, if you need bigger antenna to receive stronger signal, you can lower the transmitting power accordingly. So you can use whatever antenna that fits to your needs the best.
This for a USA application. One of my device must use omnidirectional antennas. The difference between PtP and PtM is well explain in the link below. I have also confirm those information in the FCC rules (part 15 Section 15.247). Am I right to thing that?