[Elecraft] Magnetic Shielding Kit Now Available for K2's VCO Inductor
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 --- http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Magnetic Shielding Kit Now Available for K2's VCO Inductor
wayne burdick wrote: (Order #K2VCOSHLDKT). I am deeply honored to have an Elecraft part number named after me. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Magnetic Shielding Kit Now Available for K2's VCO Inductor
In a message dated 10/6/2005 6:28:59 P.M. Eastern Daylight Time, [EMAIL PROTECTED] writes: The K2’s VCO (voltage-controlled oscillator) may be susceptible to low-frequency modulation by very large power transformers > Will future K2 kits incorporate the mag shielding mod? Bill K3UJ ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Magnetic Shielding Kit Now Available for K2's VCO Inductor
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 --- http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com = /¯\/¯\/¯\/¯\/¯\/¯\ JEAN-FRANCOIS MENARD V A 2 V Y Z [EMAIL PROTECTED] \_/\_/\_/\_/\_/\_/ Elecraft K2 #4130 Elecraft KX1 #999 http://homepage.mac.com/jfmenard = ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com