Description: The K2’s VCO (voltage-controlled oscillator) may be susceptible to low-frequency modulation by nearby large power transformers, such as those found in high-current linear power supplies and antenna rotator controllers. Since the magnetic field from a transformer falls off rapidly with distance, such modulation can usually be eliminated by simply moving the equipment away from the transceiver (or moving it to the right side of the transceiver, farther from the VCO circuitry). In difficult cases, magnetic shielding can be used, alone or in combination with repositioning of equipment. These instructions describe how magnetic shielding can be added to the K2. Toroidal transformer T5 must be replaced with a smaller iron-powder core that can be shielded by a high-permeability ferrite sleeve. 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 squeezing or spreading the turns of T5. A DMM (digital multimeter) is used during this adjustment.
Price: 99.99 USD
Location: Fort Worth, Texas
End Time: 2024-09-23T01:56:25.000Z
Shipping Cost: N/A USD
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Item Specifics
All returns accepted: ReturnsNotAccepted
Brand: Elecraft
Compatible Brand: For Elecraft
Type: Filter
