Re: [Elecraft] [K2] Inductivity of Toroids

2013-01-01 Thread Fred Smith
Hi Daniel I must admit I took the cowards way out and ordered the pre-wound ones. But I'm interested in seeing the responses you get from others that may have measured them. Happy New Year 73, Fred/N0AZZ -Original Message- From: elecraft-boun...@mailman.qth.net

Re: [Elecraft] [K2] Inductivity of Toroids

2013-01-01 Thread Don Wilhelm
Daniel, The inductance of the RF Choke toroids measured at DC or low frequencies may not agree with the published inductane which is measured at a higher frequency. Those RF Chokes are not critical, they just need to block the RF flow and the bypass capacitor takes care of the rest. The

Re: [Elecraft] [K2] Inductivity of Toroids

2013-01-01 Thread Don Wilhelm
While we are discussing toroids, be careful not to put an extra turn on the toroids. A straight wire through the center of the core is 1 turn, a full wrap around the core is two turns. Toroids are different than solenoidal inductors. 73, Don W3FPR On 1/1/2013 9:14 AM, Daniel Heise wrote:

Re: [Elecraft] [K2] Inductivity of Toroids

2013-01-01 Thread Brian Alsop
Don, Interesting that one never knows just how the quoted inductance is determined. Do you have any idea just how the Elecraft quoted inductances are determined? If measured, what frequency and test jig. If based upon calculations, how much as built variation will there be. Have had the

Re: [Elecraft] [K2] Inductivity of Toroids

2013-01-01 Thread Don Wilhelm
Brian, The K2 toroids are specified in the manual for a given number of turns on the proper core rather than their absolute inductance. The only reference to the inductance is on the schematic and in some instances on the parts list. What I can say for certain is that whatever the

Re: [Elecraft] [K2] Inductivity of Toroids

2013-01-01 Thread Fred Townsend
dust in a RF lab. 73, Fred, AE6QL -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian Alsop Sent: Tuesday, January 01, 2013 6:54 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] [K2] Inductivity of Toroids Don