[600MRG] Loading Coil with a Tuning Disc in the center

[J Mcvey]

OK, but a shorted turn will also reduce the overall Q as well.
It will also sap energy.
I think we don't see this method in newer stuff for good reason...
 

    On Monday, May 7, 2018, 12:00:25 PM EDT, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:  
 
 On 7 May 2018 at 14:11, J Mcvey via 600MRG wrote:

> I have some similar devices that can be found in old BC-375 tuning units.
> I wonder about the efficiency of that setup though,
> What about the circulating currents that would set up in the disk? Wouldn't that 
> act like a shorted turn?

That, in fact, is the whole point. National used a similar device, a shorted turn, in the coils 
for the HRO to enable adjustment of the inductance to aid in tracking.

Ken W7EKB

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