Thanks to those who replied to my question about upgrading the old KLM 4el
40m yagi.
Apparently, there have been no computer models generated to improve its
gain or F/B. It is dual driven element so it covers the whole 40m band with
a good SWR. I guess one could choose the Reflector and Director lengths to
optimize gain or F/B for CW or SSB, although there would probably not be
that much difference.
M2 does offer a different element loading system and element mounting
block, the same as their current 40m yagis. The biggest advantage is that
their parts are made of aluminum, not like the original black plastic type
material of the KLM.
The KLM version has worked fine for me of over 25 years. I did have to
reinforce some of the spacing insulators, and one of the element mounting
blocks split it half- not bad for 25 years of putting out a great signal!
Guess I'll put up back up as is, all thought the WX is harsher here in
Central AZ, than So. Calif. We'll see....
Ray,
N6VR
---------- Forwarded message ----------
From: Ray Benny <rayn6vr@cableone.net>
Date: Mon, Dec 10, 2012 at 11:06 AM
Subject: Re: [TowerTalk] KLM 4 el Yagi Mods and upgrades?
To: r-emails@n5ot.com
Hello Mark,
Yes, its my old KLM 4 el 40m yagi. Other than making it beefer, no one has
come up with any computer modeling for it.
Ray
On Mon, Dec 10, 2012 at 7:29 AM, <r-emails@n5ot.com> wrote:
> What band, Ray? 40m?
> Mark
>
> ----- Original Message ----- From: "Ray Benny" <rayn6vr@cableone.net>
> To: "TowerTalk" <TowerTalk@contesting.com>
> Sent: Saturday, December 08, 2012 12:26 PM
> Subject: [TowerTalk] KLM 4 el Yagi Mods and upgrades?
>
>
> I am rebuilding my 35 year old KLM 4 el yagi to put back up at my new
>> location. I was very pleased with its operation as assembled using the
>> 70's
>> - 80's manual. The original design of this yagi was done on paper, no
>> computer modeling back then.
>>
>> Are there newer mods/dimensions to increase the performance further? I
>> know
>> I can remove one of the dual driven elements and make it a 3 el, but I do
>> enjoy the full 40m bandwidth it provides. And I really don't want to take
>> time rebuilding or making parts to modify it. As it stands now, I am not
>> intending to run yagi stress, I feel it will hold up OK at this QTH.
>>
>> I did a quick search on the web but didn't find anything worthwhile.
>>
>> Tnx,
>>
>> Ray,
>> N6VR
>> Chino Valley, CA
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>
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