[TowerTalk] [Antennas] Link Coupled Tuner Question

Robert Lay (W9DMK) w9dmk at crosslink.net
Sat Mar 18 23:03:34 EST 2006

Dear Joe,

This is just a guess based on how the Johnson KW matchbox is designed (which 
doesn't even cover 160), but I think it is safe to say that many link 
coupled designs use a tap on the link coil for changing the coupling rather 
than using  a capacitor.

73 de W9DMK - Bob Lay, Dahlgren, VA
w9dmk at crosslink.net
----- Original Message ----- 
From: "Joe Giacobello" <k2xx at swva.net>
To: "towertalk reflector" <towertalk at contesting.com>; 
<antennas at mailman.qth.net>
Sent: Saturday, March 18, 2006 12:32 PM
Subject: [Antennas] Link Coupled Tuner Question

>I am considering building a link coupled tuner for 160M.  I am checking out 
>components by crudely "bread boarding" with clip leads on the bench using 
>fixed resistors for loads.  Although I am able to get to a 1:1 SWR, I am 
>observing that the series link capacitor seems to have very little effect 
>on the SWR.  I am using a 500 pF variable paralleled with about 2000 pF of 
>fixed capacitance for the series capacitor. Is this relative insensitivity 
>for the series link typical?
> 73, Joe
> K2XX
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