Electronics > RF, Microwave, Ham Radio

DIY RF EMC Biconic Antenna

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tautech:

--- Quote from: dazz1 on August 29, 2023, 03:50:31 am ---Hi
A rational person would pay the thousands for a tested, proven, calibrated antenna, but I never pretended to be rational.

--- End quote ---
:-DD
Yet you are in person....or we're both nutters !  ;D

dazz1:
Hi
The thing I like about RF is that I can start with raw materials I have in my workshop and turn them into something that does something. 
I can't do that with regular electronics where I have to buy components and assemble them to do something that probably needs programming.   

You can't buy snap-together EMC antenna (at least I haven't found any) like I am making.  That's the other thing I like about RF. I can make something not quite like anything that anyone else has made before.

dazz1:
Hi
Another ant sized step forward with the completion of the shorting bars, with the over engineered and overly complex brackets.  I would have preferred something that looked a little more organic in shape but I'd really need a CNC mill for that.

These shorting bars attenuate the resonance that happens inside the antenna. 

The next thing to tackle is the housing that supports the antenna.   I also need to make and test the baluns.   

tautech:
When you you use the shorting bars Dazz ?

dazz1:

--- Quote from: tautech on September 10, 2023, 07:47:48 am ---When you you use the shorting bars Dazz ?

--- End quote ---
All the time.  They are only required because the conic is approximated by the 6 elements. These elements form loops inside the antenna.  The shorting bar reduces this unwanted resonance.

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