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

Thu Apr 30 12:49:03 EDT 2020

Indeed, I built a 7 element 10m and a 6 element 15m some years ago and
converted 2 of my KLM yagis to OWA last year and 4 other KLM to follow
during the summer. Also converted HyGain yagis to OWA sucessfully.

73
Peter

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Tim
Duffy
Sent: Donnerstag, 30. April 2020 17:47
To: 'Robert Harmon'; towertalk at contesting.com
Subject: Re: [TowerTalk] 40m 4el KLM - replacing linear loading with coils

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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