[TowerTalk] Hardline for stubs?

[i4jmy@iol.it]

Less dielectric in the line leads to higher Q of stub.
Compact dielectric cables are quite poor performers as stub filters.
Quarter wave absortive stubs made with 7/8" lines typically show 35dB 
deep notches on mid HF, with RG213 the same stub is less than 18 dB.   

73,
Mauri I4JMY

> ---------- Initial message -----------
> 
> From    : owner-towertalk@contesting.com
> To      : <towertalk@contesting.com>
> Cc      : 
> Date    : Sun, 17 Sep 2000 20:43:52 -0400
> Subject : [TowerTalk] Hardline for stubs?
> 
> 
> With all this "air" inside and very little dielectric, is this what I 
want
> to be using for antenna transmission lines and stubs?  The center 
conductor
> is quite thick but I am pretty unsure about all this air where I 
would think
> foam or something else should be.
> 
> Your thoughts please?
> 
> Tnx & 73
> 
> Bob KQ2M




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