[Elecraft] OT: application of directional Quad in UHF

[Robert G Strickland]

Johnny...
I have no experience with UHF quads, but I modeled, used and modified an
HF quad for over 15 years. I now use a SkyHawk HF triband yagi. Based on
that experience, quads require more mechanical effort for construction
and maintenance. The form factor for a yagi is two-dimensional, while 
for a quad it is three-dimensional. Thus, packing, storage and transport 
is potentially simpler for the yagi than for the quad. Feeding a yagi is 
simpler than for a quad, because the yagi can use a solid driven 
element, while the quad generally requires a break in the driven 
element; this can complicate construction. Adding elements to a yagi 
antenna is mechanically simpler than adding elements to a quad. So, 
based on my HF experience - and thinking about UHF quads - I think 
mechanical issues might be a significant difference. At UHF a 4/5 
element yagi might be easier to deal with than a 3-el quad. My opinion.

...robert

On 4/4/2014 03:05, Johnny Siu wrote:
> Hello Elecrafters,
>
> It is off-topic and you can press 'DEL' now.
>
> Hong Kong is quite a hilly place in the rural areas. Local ham
> societies are often providing radio communication support services to
> charity organisations having fun raising sports activities in these
> areas.  We have to set up UHF repeaters at the hill tops.  Purely
> from the radio text books, a 3 element quad gives better performance
> than a 3 element yagi.  However, I seldom see using directional Quad
> in the UHF repeaters.
>
> Apart from performance, are there any disdvantages (or advantages) of
> using directional quad instead of yagi in UHF repeaters?  Could you
> share with me your experience in US?
>
> Thanks for your help in advance and please reply off-the-list to
> reduce the traffic in the mail listing (oh, yes, not forum!!)
>
> 73
>
> Johnny VR2XMC
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-- 
Robert G Strickland, PhD ABPH - KE2WY
rcrgs at verizon.net.usa
Syracuse, New York, USA