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Cross Yagi 10 Elements Gain...? - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


TonyW
 Post subject: crossyagi 10 elements gain...?
Posted: Fri Apr 29, 2005 9:14 pm 
 
Lieutenant

Joined: Fri Apr 29, 2005 9:10 pm
Posts: 3
Location: Jakarta, Indonesia
Anyone could tell me ? What the International standard gain for 10 elements VHF crossyagi ?

Thanks.

TonyW.


 
   
 
TonyW
 Post subject: Re: crossyagi 10 elements gain...?
Posted: Fri Apr 29, 2005 9:17 pm 
 
Lieutenant

Joined: Fri Apr 29, 2005 9:10 pm
Posts: 3
Location: Jakarta, Indonesia
TonyW wrote:
Anyone could tell me ? What the International standard gain for 10 elements VHF crossyagi ?

Thanks.

TonyW.


I also forgot to add that : what is the international standard for the HPBW (half power beamwidth) ?


 
   
 
SMSG
 Post subject:
Posted: Sat Apr 30, 2005 12:44 pm 
 
Lieutenant

Joined: Tue Apr 26, 2005 6:47 am
Posts: 4
Location: Singapore
Gain= >12 dBi
Frint to Back ratio => 15 dB
CPD = 18 dB
VSWR <1.5

Mounting easy interchangeable from V to H and vice versa


 
   
 
Kent
 Post subject: Crossed Yagi's
Posted: Wed May 04, 2005 3:08 pm 
Hello Tony:

There is no "Standard Gain" for a 10 element Yagi.
The gain of a Yagi depends on it's impedance, design bandwidth,
and construction.

If the antenna is well built and well designed, the gain
will be about 12 dBd.

Build as a cross Yagi, and a 90 deg phase harnass, then
the antenna will have about 12 dBdc or 12 dB Circular Polarized gain.

Mounting a Cross Yagi is also difficult.
A metal cross boom can detune the Yagi Elements.

It is best if the antenna is end mounted.
But with VHF Cross Yagi's you can use a metal mast if
the antenna is mounted X fashion, and the mounting boom
is vertical or horizontal.

Good luck Kent WA5VJB@FLASH.NET


 
  
 
Kent
 Post subject: Crossed Yagi's
Posted: Wed May 04, 2005 3:11 pm 
Half Power Beamwidth will be about 45 degrees.



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