John wrote:
Gents,
Bit of a "ring in" question here but I cant think of
anywhere/anyone else who may know. I,ve put up a yagi TV antenna with from
memory about 19 elements plus reflector. It seems to be too directional so I
can get one signal source perfectly and one poorly because they are in
slightly different directions. Question is, if I remove some of the
elements ( the way the thing is made I can unscrew the front seven or so)
will that make the antenna less directional?. Or if not, is it able to be
done?
Cheers
John



If your using the antenna for HDTV, you need only the UHF elements,
which for many TV antennas are the shorter elements at the front end of
the antenna. The VHF elements will not be needed when all OTA TV
stations go to HDTV. If you remove the longer elements at the back end
of the antenna first, you may notice that the antenna is more able to
capture UHF signal sources that are aftward of the antenna structure.

Duane

Just a thought John

Is it a directivity issue or that rotating it places the device in a
null? The way to check is to move the entire antenna some distance in
the horizontal plane, then try the rotation test again. We are talking a
small distance here, no more than a halfwave at the operating frequency
- say 6-12 inches/150-300mm maximum. Leaning on the mast would be good
enough for testing..

Yes chopping the end off the antenna will make it less directive and
lower gain. Will it be enough though? One has to ask how many degrees
"slightly" is. (Decreasing gain means an increase in the half power
beam-width) Simplest answer is to not theorize but try it! If the angle
between stations is too great a second antenna may be the only easy
solution.

Cheers Bob VK2YQA

John wrote:
will that make the antenna less directional?. Or if not, is it able to be
done?

On Jul 19, 6:35 am, "John" wrote:
Gents,
Bit of a "ring in" question here but I cant think of
anywhere/anyone else who may know. I,ve put up a yagi TV antenna with from
memory about 19 elements plus reflector. It seems to be too directional so I
can get one signal source perfectly and one poorly because they are in
slightly different directions. Question is, if I remove some of the
elements ( the way the thing is made I can unscrew the front seven or so)
will that make the antenna less directional?. Or if not, is it able to be
done?
Cheers
John

YUP.... the directivity is related to the number of director elements
and also their spacing. You may effect the gain as well? So, if the
gain is an issue you may wind up defeating your plans. Worth a try
though, since your not hurting the antenna. Good Luck