crossyagi 10 elements gain...? - RF Cafe Forums

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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.

Posted  11/12/2012