[BULK] - [SixClub] KLM 70cm yagi info needed

Wed, 7 Apr 2004 15:15:20 -0700

That was a bit confusing for me.  "Gamma match feedpoint?"  I don't recall
KLM ever using a gamma match on any VHF or UHF antenna they made.

I have a few old KLM 70cm single-polarity Yagis optimized for the low end
(432 MHz) and drilled for horizontal polarization only, so they made several
models.  One popular model was a 27 element horizontal yagi that had a log
feed system of four driven elements which made it a bit more broadband than
it would have been with a single driven element.  Another popular model was
18 elements with two driven and 16 parasitic.  All used a sleeve balun at
the feedpoint, and all used the insulated elements with plastic inserts and
C-clip retainers, just like the M2 antennas do now.

For solid guidance, I'd suggest you simply get the assembly manual for one
of the modern M2 70cm antennas like the model 440-18.  That's an 18L 70cm
yagi on a 12' boom with a mounting plate that can be arranged for either
vertical or horizontal polarization.  It uses a single DE with a T-match and
balun, and works very well for its boom length.  You can probably clone it
with parts from the X-pol yagi you have, for the most part.

WB2WIK/6

"Success is the ability to go from failure to failure with no loss of
enthusiasm." -Winston Churchill

> -----Original Message-----
> From:	Dennis Kaylor [SMTP:[email protected]]
> Sent:	Wednesday, April 07, 2004 12:06 PM
> To:	[email protected]; [email protected]
> Subject:	[BULK] - [SixClub] KLM 70cm yagi info needed
> 
> hey guys
> did KLM  make any 70cm yagis other than the 18 ele crossed yagis for 
> Satellite work?
> if so i would be interested in the boom layout of an 18 ele 432mhz yagi
> i have a crossed which is only 9 ele each way and want to convert it to 
> a 18 ele horizonal yagi
> this is the type where the elements go thru the boom and are insulated 
> and held in place with these funny insulators
> now these elements are just 1/8th aluminum rod there is no bolt holes in 
> them so i cant just bolt them to another boom
> so does anyone have any info to pass along
> i would even be interested in a data sheet from a antenna software
> keeping these facts in mind
> 1/8th solid rod elements
> insulated from boom
> max forward gain
> gamma match feed point
> center freq 432,100 mhz
> 18 ele or less
> thanks
> 
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