[Antennas] Quad Matching Device

[NPAlex at aol.com]

The Lightning Bolt quad matching device is essentially a 2:1 BalUn.   
Typically the higher frequency bands (10,12 and 15) have source impedance near  100 
ohms, 20 and 17 closer to 50 ohms but could as high as 75 ohms.    One of the 
LB baluns had a HI and LOW tap to accommodate that difference.   Try the 2:1, 
it should work okay.  If the original balun just has the  housing cracked, it 
probably will still work fine as the "guts" are encapsulated  and pretty 
impervious to the environment.
 
Norm W4QN
Former owner of Cubex Quads.
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Message:  2
Date: Sat, 20 Jan 2007 20:00:54 -0800
From: Bill Brannick  <wmlb at sbcglobal.net>
Subject: [Antennas] Lightning Bolt Quad  Inquiry
To: Antenna Net <antennas at mailman.qth.net>
Message-ID:  <20070121040238.92EE1859C1F at mailman.qth.net>
Content-Type:  text/plain; charset="us-ascii"; format=flowed

I have had a LB quad (5  band, 2 element version) up for 14 years now.
Recently during the "Santa  Ana" winds, one of the element wires broke
loose from the matching device.  I sent one of my sons up there to
re-attach the wire and he found that the  material used to house
the 239 connector, and whatever was used as a  matching device, was
cracked through and through.

The antenna seems  to function normally so we just filed the crack
with a epoxy material in  the hope that it would hold up for a while.

Lightning Bolt quad went  out of business  last year (or perhaps it was in 
2005)

So ... does  anyone here know what balun,  or matching transformer ,
or "whatever"  can be used to replace the original matching device
included in the  original design. Sooner or later I will need to
replace that device and  would like to know in advance what options I will 
have.

Of course, I  could feed each element individually, but would rather 
not mess with the  wire  lengths and the shape  (front to back) of the  
antenna

Thank you for any assistance offered.

Bill,  W6WLB





Regards,
Norm W4QN