Re: Proper transient protection for Ethernet antenna feedlines.
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The best way to protect the loop amp is to use a relay to short out the antenna input when transmitting. Most transceivers have a key out that can be used to kill the power to the loop amp, which will then short out the antenna input on the loop amp
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Everett N4CY
In a message dated 7/24/2024 10:00:43 AM Central Daylight Time, wassermanr46@... writes:
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Martin,
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From engineering prospective, having less headackes, by running a fiberoptics cable between two buildings with electro-optical convertors is the best solution.
However, it might cause a financial burden for the customer.
I misunderstood his application completely? by using muliple pair ethernet cable - there will not be a transfer of data at all but a remote control between the loop antenna and radio. I looked at closer the designed SPD for Ethernet cables: basically there is no RF filtering but gas discharge tube protectors between leads and common ground terminal. They cannot effect DC control leads. Of course, should be considered a parasitic shunt capacitance for RF signal.
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Raphael
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Everett N4CY