[Boatanchors] Link coupled output?

[Eugene Hertz]

Well, I certainly have no idea what I am talking about, but if I were faced with this problem, I might try to transmit into an antenna with an antenna tuner and SWR meter. Set the tuner to arrive at 1:1 swr. Then I would try to use some kind of impedence measuring device and look down the tuner/antenna to see what its impedence is. Since I know the match was 1:1 then the transmitter's impedence must be the same. No?

Eugene


>-----Original Message-----
>From: StephenTetorka at cs.com [mailto:StephenTetorka at cs.com]
>Sent: Thursday, September 8, 2005 08:57 AM
>To: boatanchors at mailman.qth.net
>Subject: [Boatanchors] Link coupled output?
>
>Hi all: 
> 
>I am trying to determine what characteristic impedance transmission line to 
>use with my homebrew 1948 transmitter. 
> 
>The unit uses two 1625's in the RF deck with a B&W type JVL link coil for the 
>output to the antenna terminals. 
> 
>In this arrangement, the B+ goes into the center tap of the coil with one 
>section of a two gang variable across each half of the coil from center tap. 
> 
>The antenna terminal output comes from a separate 3 turn coil located in the 
>middle of the coil between the two halves..thus obtaining the RF coupling. 
> 
>This arrangement is typlical of 1940's - 1950's rigs. 
> 
>Would appreciate any assistance in this matter. 
>Regards, 
>Steve 
>WA2TAK 
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