[Elecraft] Magnetic Shielding Kit Now Available for K2's VCO Inductor

[JEAN-FRANCOIS MENARD]

1- Will it be more difficult to tune T5 instead of asjusting L30 ?
2- Will it be standard in K2 kit now  or it is just optional ?
3- Will we loose precision on the VCO stability, or any other manner  
regarding performance when applying this mod ?

I'm planning to buy and build another K2... very soon... ;-)

73

Le 05-10-06 à 18:31, wayne burdick a écrit :

> The K2’s VCO (voltage-controlled oscillator) may be susceptible to  
> low-frequency modulation by very large power transformers, such as  
> those in linear amp power supplies and antenna rotator controllers.  
> Such modulation can usually be eliminated by simply moving the  
> equipment away from the transceiver. In difficult cases, magnetic  
> shielding can be used, and we've created a modification kit for  
> this purpose (Order #K2VCOSHLDKT).
>
> The mod kit provides a smaller replacement core for transformer T5,  
> a high-permeability ferrite sleeve, and associated hardware. The  
> ferrite sleeve is installed over T5, greatly reducing the effect of  
> nearby strong magnetic fields. In addition, slug-tuned inductor L30  
> must be electrically disabled since it, too, is affected by  
> magnetic fields. With L30 out of the circuit, the VCO inductance  
> can still be adjusted, if necessary, by slightly squeezing or  
> spreading the turns of T5.
>
> The kit is priced at $10. For more information, see our parts order  
> page:
>
>    http://www.elecraft.com/order_form_parts.htm#K2%20Parts
>
> 73,
> Wayne, N6KR
>
>
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