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dlec Profile
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Freebander

Registered: 03-2013
Location: Germany
Posts: 28
Karma: 1 (+1/-0)
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Need help with Antenna Reflector or Director


Hello, i need help with my Folded Dipol. She works very beautiful (QSO with 12.000km).I would like to improve this antenna with a reflector.

This is a Pic from my Balcony:

Image

Image

My idea Folded Dipol with Reflector.

Image

My Question:

- Works this?
- What is better, reflector or director?
- Can you tell me how long the reflector and distance to dipole?






Last edited by dlec, 1/May/2013, 1:59 pm
1/May/2013, 1:56 pm Link to this post Send Email to dlec   Send PM to dlec Blog
 
108FB173 Profile
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Freebander

Registered: 11-2011
Posts: 41
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Re: Need help with Antenna Reflector or Director


A good general rough and ready guide the reflector should be 3% to 5% longer than the driven element and the director is aprox 3% shorter than the driven element and the spacing around 20%

also have you considered a Lazy H antenna as a alternative
22/Jun/2013, 11:15 pm Link to this post Send Email to 108FB173   Send PM to 108FB173 Blog
 
SuperNasty Profile
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Freebander

Registered: 01-2012
Location: NI
Posts: 59
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Re: Need help with Antenna Reflector or Director


Nice antenna there, and lots of height too.

I reckon a beam with a driven element and reflector is no better or worse than a beam with a driven element and director, they just work differently.

The driven with a director on front will have more gain to the front and no rear rejection. The driven with a reflector at the back that you have will have slightly less gain to the front but better rear rejection, saying that, your building will be acting like a reflector also.

It may not be practical to put a director on the front for you as you would need to bring the driven element back to the wall which may not work as well as it does out in the free space as it is now.

You could try a wire Moxon antenna also with the shape of the space you have, the director and reflector are bent to meet each other with a small gap between reflector and director. They work extremely well and will ensure near all the power TX and RX will go to the front direction.

73s

---
(Forum user name was previously - mikefox whiskey) - 68 FB750 - Pat

Kenwood TS870 - Centre fed balanced dipole - HPSD 2 element Moxon for 11m, vertical 'Ringo' for 11m.
27/Jul/2013, 1:38 pm Link to this post Send Email to SuperNasty   Send PM to SuperNasty Blog
 


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