Safety concerning ERP of transmitter

In summary: If the switch is below the bottom of the array the exposure would be pretty small but it is a health and safety matter so you should perhaps get hold of an RF Hazard Meter. If this is a commercial setup then you will be aware of your liability and the risks to staff and public.I doubt that he is using the type of antennas used for a commercial TV transmitter stationRight enough but he would only need eight stacks. For 2GHz they would be perhaps 1/4 the height of a UHF transmission antenna. and if he just used single vertical dipoles against a narrow mast, his HRP would be cardioid shape. That's practically 'omni' if you put the null where
  • #36
sophiecentaur said:
But we have to assume the OP is legit or we shouldn't be having this conversation. :smile:

probably a really bad assumption :wink::wink:
don't think I have ever seen one of these styles of posts where the OP was operating in a legit way :rolleyes:
 
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  • #37
VivaLaFisica said:
The cables used are RG59.
As well as the high losses mentioned by davenn, RG-59 cable has a characteristic impedance of 75 ohms whilst the antenna you proposed is 50 ohm (from its data sheet). You need to use a low-loss cable with the same impedance as your chosen antenna to reduce matching losses and ghosting on analogue video (at least on long feeder runs).

Antennas used for broadcast reception tend to be 75 ohm whilst antennas used for transmit/receive systems are usually 50 ohm. You should check the specification for the antennas you choose then get matching cable and connectors.
 
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