[TowerTalk] 40m 4el KLM - replacing linear loading with coils

[Robert Harmon]

Tim,

Thanks for the info !   I am thinking about fabbing a  20M OWA.  I  have the materials 
and more than enough time now with the shelter in place, hihi.  

Bob
K6UJ




> On Apr 30, 2020, at 8:47 AM, Tim Duffy <k3lr at k3lr.com> wrote:
> 
> I have used OWA Yagi's for over 20 years, so lots of real experience - I
> would never install anything else here.
> The wide VSWR bandwidth is really a great feature.
> I have four legacy beta matched 10 meter and 6 meter Yagi's that will be
> replaced this summer with OWA ones - then we will be 100% OWA here (save for
> two Moxons on 40 meters). OWA Yagi's are simple, efficient and easy to
> build. Modeled designs hold in the real world, another great feature
> 
> It's not too good to be true - it's just good science :-)
> 
> 73
> Tim K3LR
> 
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
> Robert Harmon
> Sent: Wednesday, April 29, 2020 11:37 PM
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] 40m 4el KLM - replacing linear loading with coils
> 
> How much loss is there in a conventional Yagi match ?    From what I
> understand the OWA has about a .50 dB loss in forward gain compared
> to a conventional Yagi.  If a conventional yagi has about the same .50 dB
> loss in the match system then they would both have about the 
> same forward gain.  Then............. the OWA is winner with its wideband
> SWR curve.   
> Sounds like a   " If it seems too good to be true"   thing :-)
> 
> Bob
> K6UJ
> 
>> On Apr 29, 2020, at 10:43 AM, john at kk9a.com wrote:
>> 
>> 
>> That seems a little high for OWA gain reduction, especially with modern
> designs. I believe the theory is that a conventional a Yagi has losses from
> the match and a OWA of course has no match losses. Most of the high scoring
> contest stations are using OWA Yagis.
>> 
>> John KK9A
>> 
>> 
>> Brian K6STI wrote:
>> 
>> If you think the 0.5 to 1 dB a conventional OWA costs in forward gain is
>> inconsequential, check this out:
>> 
>> http://ham-radio.com/k6sti/pileup.htm
>> 
>> The analysis isn't definitive. But the next time it takes forever to
>> bust a pileup with your OWA, you may not be able to get the probability
>> curves out of your head.
>> 
>> _______________________________________________
>> 
>> 
>> 
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