[Boatanchors] 1930's era cw transmitter

[mac]

No inherent difficulty with feeding coax from a link but the tank/link  
coil arrangement has to be designed with just the right turns ratio if  
fixed or, alternately, with a variable arrangement (swinging or  
rotating link, series cap, etc.) configured to provide a match over a  
range of load impedance values.

Dennis D.  W7QHO
Glendale, CA

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On Jun 3, 2013, at 4:53 AM, Rob Atkinson wrote:

> On Sun, Jun 2, 2013 at 8:47 AM, Bry Carling <bcarling at cfl.rr.com>  
> wrote:
>> Another popular (but tricky) circuit from the 1930s was the LINK  
>> COUPLED RF final.
>>
>>
>
> It was "popular" because the feedlines of the day were balanced
> parallel wire.  What you are probably really referring to is the swing
> link output.  Since just about everyone (not exactly sure when
> unbalanced line became common but I think it was after WW2) used open
> wire line, a balanced link coupled output was pretty much a standard
> arrangement.   The Meissner 150B from WW2 used a pi network because it
> was originally made to work into a random length wire (unbalanced) in
> the field.  That's about the earliest rig I know of using a pi network
> output (but my knowledge is far from complete).
>
> you don't say what feedline you were using.  If you were trying to get
> the link coupled to work directly into 50 ohm coax then of course
> you'd have difficulty.  It was designed to work with twisted pair or
> parallel line to either a balanced dipole or a floating link input to
> a balanced tuner like a EFJ matchbox (but with its link connected to
> the twisted pair).
>
> 73
> Rob
> K5UJ