[TowerTalk] 10/15 yagi design

[Grant Saviers]

My interlaced 30/17 beam design effort demonstrated to me the 
difficulties and the experience (and art) needed to get the general 
interlaced architecture in a good starting place.  In fact, I'm amazed 
that designers have succeeded with 5 band designs on one boom with one 
feedpoint.

Then AutoEZ is a terrific tool to find the desired sweet spot of gain, 
F/B, & swr bandwidth buts needs that good starting point to optimize. 
It sometimes goes "into the weeds" in its searching. And for 10 elements 
a lot of MIPS and NEC4.2 and probably many tries. I also found there was 
no free lunch as even successful interlacing cost some performance loss 
usually in gain and F/B vs same envelope single band versions.  So would 
suggest starting with good monoband OWA designs to interlace.

Grant KZ1W



On 7/9/2020 18:57, John Simmons wrote:
> JK antennas have designs that you might look at for ideas.
> 
> -de John NI0K
> 
> john at kk9a.com wrote on 7/9/2020 8:23 PM:
>> In the past I found it difficult to design interlaced Yagis so I have
>> avoided building them. Now that AutoEZ is available it should be easier.
>>
>> GL
>> John  KK9A
>>
>>
>> Dave Sublette k4to wrote:
>> I am looking for a design for a 10 and 15 meter yagi on a single boom.  I
>> have a couple of ideas to model, but I thought I would ask here to see 
>> what
>> your favorites are.  I don't want to buy a commercial product.  I have
>> plenty of boom and element tubing and have home brewed all of my antennas
>> through 432 MHz for 30 years.
>>
>> I use a program called Antenna Model which works quite well.   In the 
>> past
>> three years I have modeled and put up a pair of 40M Moxons, a four 
>> element
>> 20M OWA (G0KSC design modified for my tubing sizes), and a full sized 40M
>> dipole. They all work great and match the model closely.
>>
>> I'm just looking for ideas.
>>
>> Thanks and  73,
>>
>> Dave, K4TO
>>
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