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

[wayne burdick]

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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