A friend of mine was needed to change the "balun" of his LBA quad recently
(a year ago). I called Mike WB3ECM who was constructed these antennas to
find a replacement. He told me that he is retired now and suggested an 2:1
amidon balun. Finally we preffered the balundesigns as it had better
comments in eham.net
http://www.balundesigns.com/servlet/the-2-dsh-1-Baluns/Categories
My friend bought this balun which it was just a perfect replacement for his
LBA.
73 Kostas sv1dpi
----- Original Message -----
From: "Joe Subich, W4TV" <lists@subich.com>
To: <>
Sent: Monday, June 27, 2011 6:45 PM
Subject: Re: [TowerTalk] 2:1 Transmission Line Transformer
>
> Almost certainly a 2.25:1 un-un or a five winding toroidal
> transformer.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 6/27/2011 11:31 AM, Barry N1EU wrote:
>> Steve, it was a balun for matching their quads and delta loops to
>> 50-ohm coax and was magically compact (~3in diam X 2in high).
>>
>> Perhaps I need to find one and dissect it.
>>
>> Barry N1EU
>>
>> On Mon, Jun 27, 2011 at 11:11 AM, Steve Hunt<steve@karinya.net> wrote:
>>> Barry,
>>>
>>> I wonder if it was an UnUn rather than a BalUn. Sevick shows a simple
>>> 2.25:1
>>> UnUn transformer comprising a trifilar winding on a single core.
>>>
>>> I can't think of any way you'd do a true 2:1 TL Balun with a trifilar
>>> winding on a single core!
>>>
>>> 73,
>>> Steve G3TXQ
>>>
>>>
>>> On 27/06/2011 15:53, Barry N1EU wrote:
>>>
>>> Lightning Bolt used to offer a compact 2:1 balun that was described as
>>> a "transmission line transformer that is trifilar wound on a ferrite
>>> core."
>>>
>>> Can anybody direct me to details on such a single core design? I've
>>> searched the Web and Sevick's books with no success.
>>>
>>> Thanks/73,
>>> Barry N1EU
>>> _______________________________________________
>>>
>>>
>>>
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>>>
>>>
>>>
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>>
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