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

[dj7ww at t-online.de]

There is no reason a yagi match would loose 0.5dB.
>From 28 ohms to 50 the match will loose not more then 0.01dB.
By lengthening the boom for OWA the gain can be kept the same as with the
conventional yagi.

73
Peter

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
Robert Harmon
Sent: Donnerstag, 30. April 2020 05:37
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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> 
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