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Leicozic directional antennas, has anyone tested them

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I have seen this company Leicozic (https://www.aliexpress.com/item/32961947715.html?spm=a2g0o.detail.1000060.1.5a0435e3w4c4i2&gps-id=pcDetailBottomMoreThisSeller&scm=1007.13339.146401.0&scm_id=1007.13339.146401.0&scm-url=1007.13339.146401.0&pvid=fd14c1ac-f7b3-485b-9e09-7785935d7987)

that  has many products as iem receivers compatible with sennheisers and rf distributors, has anyone tested their antenna?

they are all active, can be   used as passive without any DC applyied to them? how do they look constructively


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9 hours ago, resonate said:

Active antennae need power. They will not work without it. They are a different design.





In case using them on bag and or with short cables maximum 1 - 2 meters with a rf distributor like psc sma, i wouldnt need a  active antenna, so in this case i can set them 0 db?


and what happen in case i want to use on only 1 receiver like a lectrosonics UCR411 it cant feed the antenna. 

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1 hour ago, alidav said:

there no way to bypass the booster? 


Looking at the photo, it seems you can disconnect the preamplifier or even insert an attenuator depending on the gain you choose. Of course provided the block diagram really describes it.


However, I guess the gain selection switch might need DC power in order to operate. I don´t see a photo of the switch itself. But in that case you can use a simple bias-tee like this one.




Of course, this is just an educated guess. Beware active antennas without filtering in front of the preamplifier though. 



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