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It does not suggest screening. It's just a phono socket. Or it can be a BNC socket.
A BNC connector is a SCREENED connector.
As is a phono socket.
A BNC connector is a SCREENED connector.
It is only screened if it is connected to a screened cable
It is only screened if it is connected to a screened cable
Can I add one more description to this pi**ing contest?
It could represent a co-axial connector.
I use the word co-axial to represent an RF type cable rather than just a screened cable, which may be fine at audio frequencies but have excessive loss at RF.
As the circuit shown by the OP appears to be an amplifier for a low (RF) frequency loop antenna, I will stick with my description of co-ax connector as the output is intended to go to the input of a receiver which I guess will have a co-ax socket.
Both BNC and Phono sockets are coaxial as well, presumably you're referring to a Belling-Lee connector?. Certainly the fact it hints at been a coaxial connector is why I mentioned it might be a screened socket.
Incidentally, he phono plug/socket is considered to be quite a good socket for RF use, I have seen it used for making connections between modules at 160Mhz (ish) inside commercial radio equipment.