[NLRS] Old 2M antenna Question

[Mike King - KM0T]

Gerry, the manual says 200 ohms is the Z of the feed, hence 4:1 balun.  The
manual appears to be clear on this point.

Mike - KM0T

-----Original Message-----
From: NLRS [mailto:nlrs-bounces at mailman.qth.net] On Behalf Of Dr. Gerald N.
Johnson
Sent: Monday, April 20, 2015 11:12 PM
To: nlrs at mailman.qth.net
Subject: Re: [NLRS] Old 2M antenna Question





On 4/20/2015 9:10 PM, Mike King - KM0T wrote:
>
>
> Hi all,
>
>
>
> Thanks for all the great responses on my question.  I appreciate all 
> you taking time to email me about a good course of action.
>
>
>
> Consensus is.
>
>
>
> Point the antenna up in the air to test and tune..
>
>
>
> I will do this as soon as the winds die down around here. 30 to 40 MPH 
> the last two days.
>
>
>
> The antenna did come with a 4:1 Teflon coaxial balun.  It appeared to 
> be in good condition and appears to be working.

But if the driven elements are simple dipoles, not folded dipoles, the
4:1 impedance is wrong. Simple or LP dipoles need more like a 1:1 balun
which is what the KLM yagis with 4 driven elements had. The manual should be
clear on that, though I wasn't able to find one to download.

73, Jerry, K0CQ
>
>
>
> Tuning can be accomplished by changing the spacing between the phasing 
> straps.  If it does not work when pointing up at cold sky, I will give 
> that a try.
>
>
>
> No the antenna is not for sale :0  not yet anyway.
>
>
>
> I will update you when I get back to working on it.
>
>
>
> 73
>
>
>
> Mike- KM0T
>
> EN13vb
>
>
>
> ______________________________________________________________
> NLRS mailing list
> Home: http://mailman.qth.net/mailman/listinfo/nlrs
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:NLRS at mailman.qth.net
>
> This list hosted by: http://www.qsl.net Please help support this email 
> list: http://www.qsl.net/donate.html
>
>

______________________________________________________________
NLRS mailing list
Home: http://mailman.qth.net/mailman/listinfo/nlrs
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:NLRS at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html