[VHFcontesting] KLM 432 Antenna Details wanted

[Bill Olson]

FWIW, the 15 element 432 Yagi, designed by the late Don Hilliard, W0EYE (later W0PW), was published in QST in 1972. I am pretty sure this was one of the
"NBS" Yagi designs that we all gravitated to in the early 70's. Several designs... 3.2 wavelength, 4.2 wavelength.. smaller ones too. These antennas were the standard early on.

Don was a really great guy. He was really into Bluegrass music and I remember early Microwave Updates in Estes Park, Colorado with Bluegrass sessions.. Rick, KK7B, (not many remember him as a really great Bluegrass fiddler) was there too.. great times!!!  (RIP Don)

bill, K1DY

________________________________
From: VHFcontesting <vhfcontesting-bounces+callbill=hotmail.com at contesting.com> on behalf of MERLE COX <w7yoz at centurylink.net>
Sent: Tuesday, September 14, 2021 10:44 PM
To: Roger(WA1NVC) Coulson <wa1nvc at gmail.com>
Cc: vhfcontesting <vhfcontesting at contesting.com>
Subject: Re: [VHFcontesting] KLM 432 Antenna Details wanted

Hello Roger,

Hi Roger I bought one of the first 432-16LBX from Mike Stahl in about 1975 when living in the SF Bay Area and operating as W6BXO.  It was one of the first commercial yagis for 432 with measurable high gain before the later NBS, K1FO etc. computer designed configurations.  I was very pleased with based on its rugged large diameter elements and good match based on the  Oliver Swan 3 driven element design. It performed well for me through 1991 when replaced with a CC Boomer fo that band. I have the original assembly instructions but they do not give any performance specs that you wanted.  It is as you noted 16 elements on a 12' boom.

I am currently using the Directive Systems DSE FO 432-15RS which is performing very well and based on its proven design likely has some more gain that the
432-16BLX  Whether enough more to really notice is always the difficult question to answer.

I am also using a Antennas-Amplifiers 1,296 MHz 4' boom yagi which is performing better that a previous loop yage.  The design and craftsmanship is impressive. believe both this and the Directive System antennas are more for your money than the current M2 antennas which have become quite pricey.

Hope this helps,

Merle W7YOZ


----- Original Message -----
From: "Roger(WA1NVC) Coulson" <wa1nvc at gmail.com>
To: "vhfcontesting" <vhfcontesting at contesting.com>
Sent: Tuesday, September 14, 2021 11:27:14 AM
Subject: [VHFcontesting] KLM 432 Antenna Details wanted

Folks:

Does anyone have information on this old 432 beam I have been using for
years?

It is a KLM 432-16LBX ??? or something like that.
I can't find the specs or find any literature on it.instt

KLM 432-16LBX???
16 elements (3 driven)
??.? dBd gain
120" (10' 0") approximate boom
20 degree??? beamwidth
NLA

There are 16 elements but three of them make up the driven element so it
is the equivalent of a 14 element beam.

I remember the bandwidth was 432-436 MHz or similar unlike their log
periodic antennas with a bandwidth of 420-450 MHz.

The element spacing is wide and there is a KLM sleeve balun for the
three driven elements.

Does anyone have the details/comments on the KLM?

I was thinking of replacing it with an M2 440-18X or Antennas-Amplifiers
PA432-14-3B.

M2 Antennas
440-18x
18 elements
14.3 dBd gain
135"(11' 3") boom
27 degree beamwidth
$260

Comments on the M2?

Antennas-Amplifiers
PA432-14-3B
14 elements
14.0 dBd gain
114" (9' 6") boom
30 degree beamwidth
$125e (~$207 delivered)

Comments on the Antennas-Amplifiers?

Maybe compare to DSE FO432-15RS?

Directive Systems
DSEFO432-15RS
15 elements
13.5 dBd gain
96"(8' 0") boom
30 degree beamwidth
$229 + shipping

Roger
WA1NVC
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