Topband: 1:2 UNUN

[Frank W3LPL]

Hi Pete, 

1/4 wave electrical length. 

89 feet for two RG-11 solid dielectric coaxes in parallel. 

73 
Frank 
W3LPL 


From: "Pete N4ZR N4ZR" <pete.n4zr at gmail.com> 
To: "donovanf" <donovanf at starpower.net> 
Sent: Monday, January 17, 2022 5:12:48 PM 
Subject: Re: Topband: 1:2 UNUN 



lengths? 1/4 wave? 
73, Pete N4ZR
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On 1/17/2022 11:29 AM, Frank W3LPL wrote: 



Hi Kenny,

A very workable alternative is to use two lengths of 75 ohm coax
in parallel.  RG-11 is the best choice, but two lengths of RG-6
will also work. No need to coil it up, simply use it as part
of your transmission line from your antenna base to your station.

73
Frank
W3LPL

----- Original Message -----
From: "Kenneth Silverman" [ mailto:kenny.k2kw at gmail.com | <kenny.k2kw at gmail.com> ] To: "topband" [ mailto:topband at contesting.com | <topband at contesting.com> ] Sent: Monday, January 17, 2022 2:18:30 PM
Subject: Topband: 1:2 UNUN

Does anyone have a drawing on how to wind a 1500w 1:2 UNUN?  And what type of core is needed?

This is for my 160m vertical which is about 28 ohms. 

Regards , Kenny K2KW 
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