[AMRadio] Link Coupling

Geoff/W5OMR ars.w5omr at gmail.com
Wed Sep 5 12:31:03 EDT 2007

Geoff/W5OMR wrote (with a few typos):
> It's the same, Rick, as mounting your grid-input coil turned 90 degrees from your plate coil, to reduce the
> effect of the grid-input from interacting with the plate output.  This also helps *ease* neutralization.  
> MY big 250TH final was built back in the mid-50's (not by me) by a non-ham, who was building the rig, had an
> interest in electronics and had friends who were already hams.  He built the transmitter out of some *ARRL* handbook(s).  
> *I* would have thought that having the grid input coil, and it's swinging link -below- the steel chassis would have been enough physical space to counter-act the interaction effect between input and output circuits.  
> Not the case.
> This became even more evident when I went to visit Dave/W4QCU in *Oak Ridge, TN*.  His "Big Bertha" rig, has a pair of 100TH's in push-pull, link coupled, *in the final* and the grid input coil and the plate output coil are both on the same side of the chassis.  The big difference in his rig and mine is, in Dave's rig, the two coils are at right-angles to each other.  
> Ergo, no interaction, and neutralization is smooth and simple.
> Clear(er)?

Sorry about the typos and the un-clear message.  That -should- have 
fixed it.


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