Came the urgency to arrannge a certain yacht marine radio DIY antenna.
Read the most frequently are used vertical dipole made of stripped cable, let the quarterwave braiding along the coaxial downward forms the one branch and central wire upward makes another quarterwave branch. I like such simplicity, but my all senses signalizing at least a two provocative mistakes must be here.
1) In counseling video www.youtube.com/watch?v=SdEglNHyHB4 is shown that downgoing braiding comes ALONG (near) the upgoing cable. For my imho then upgoing current will compensate the downgoing what is very much wrong. The braiding must be weared fully OVER the incoming cable like women socks when taking off, let the air sees only radiated current but inner is shielded. Am I right, or am I wrong?
2) In hundreds of websites are told - do this dipole and just plug the cable in radio. I feel it is even the more terrible mistake. The plug is assymetric, coaxial is asymetric, but dipole is symmetric. Thus to avoid the radiating from the whole cable braiding being probably 12 meters or even longer, it ought to include the balun. And, to my experience, nothing is so simplistic and effective as just some 5 turns air-core wound the same coaxial cable somewhere rather near to the entering the antenna, I mean dipole lower end. Diameter of this coil is not so much important. Am I right, or that marine antennas ares some sort of grand exclusion what demanding no coil (balun)?
3) those idea about bending the ends of wires around the tubulus ends sounds spooky too for my much suffered ears. I am 3/4 sure those bendd length at least particularly comes in count of resonance. Why not use the fishing thread instead?
Read the most frequently are used vertical dipole made of stripped cable, let the quarterwave braiding along the coaxial downward forms the one branch and central wire upward makes another quarterwave branch. I like such simplicity, but my all senses signalizing at least a two provocative mistakes must be here.
1) In counseling video www.youtube.com/watch?v=SdEglNHyHB4 is shown that downgoing braiding comes ALONG (near) the upgoing cable. For my imho then upgoing current will compensate the downgoing what is very much wrong. The braiding must be weared fully OVER the incoming cable like women socks when taking off, let the air sees only radiated current but inner is shielded. Am I right, or am I wrong?
2) In hundreds of websites are told - do this dipole and just plug the cable in radio. I feel it is even the more terrible mistake. The plug is assymetric, coaxial is asymetric, but dipole is symmetric. Thus to avoid the radiating from the whole cable braiding being probably 12 meters or even longer, it ought to include the balun. And, to my experience, nothing is so simplistic and effective as just some 5 turns air-core wound the same coaxial cable somewhere rather near to the entering the antenna, I mean dipole lower end. Diameter of this coil is not so much important. Am I right, or that marine antennas ares some sort of grand exclusion what demanding no coil (balun)?
3) those idea about bending the ends of wires around the tubulus ends sounds spooky too for my much suffered ears. I am 3/4 sure those bendd length at least particularly comes in count of resonance. Why not use the fishing thread instead?
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