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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