Re: [Elecraft] RE50B microphone connected to K3
I guess I misused the term ground. vs shield. I think we are basically saying the same thing just that you are using correct terminology, My Bad. David Moes VE3DVY www.Facebook.com/PTBOTheatreGuild www.Twitter.com/PTBOTheatre www.YouTube.com/PTBOTheatreGuild --- Original message --- Subject: Re: [Elecraft] RE50B microphone connected to K3 From: Jim Brown j...@audiosystemsgroup.com To: elecraft@mailman.qth.net Date: Saturday, 04/02/2012 9:29 AM On 2/4/2012 8:42 AM, David Moes wrote: E50b is a low z dynamic mic that is well suited to voice and is an excellent mic should work well for K3. Yes. An RE11 or RE16 is even better, because they are directional and reduce background noise pickup (fans, room noise, etc.) To use this unbalanced you are correct to connect pin1 to pin3 (cold to ground) Yes, Pin 3 to Pin 1 is right, but Pin 1 is the SHIELD, not ground, and Pin One must go to the SHIELDING ENCLOSURE (the chassis) to provide shielding and prevent the Pin One Problem. The distinction between ground which some interpret (wrongly) as a connection to the EARTH, and a connection to the SHIELDING ENCLOSURE is important -- no connection to the EARTH is needed to prevent noise or RFI issues. do not connect the XLR connector body to the ground it should be left floating. Again, this word ground confuses the issue. Inside the microphone, there MUST be a connection between Pin One and the metal shell of the mic -- this provides shielding for the mic itself. AES Standards also call for a connection between Pine One and the shielding enclosure INSIDE EQUIPMENT, but require that there be NO connection between the cable shield and the cable shell. There are very important reasons for this that don't matter here. :) 73, Jim Brown K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] RE50B microphone connected to K3
Has anyone had experience in tying pin 3 to pin one in an XLR connector to enable the transition from a balanced microphone to the unbalanced input of the K3? In this regard I have used this arrangement to attach an Electrovoice RE50B to my K3 and, although I have made satisfactory contactswith this arrangement, I ask because many of you respondents appear experienced in audio and may have alternatives to making this interconnection. John Kountz, WO1S/T6EE 2 x K3s __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] RE50B microphone connected to K3
RE50b is a low z dynamic mic that is well suited to voice and is an excellent mic should work well for K3. To use this unbalanced you are correct to connect pin1 to pin3 (cold to ground) do not connect the XLR connector body to the ground it should be left floating. I have used many balanced dynamics in this way with many rigs without issue . David Moes VE3DVY www.Facebook.com/PTBOTheatreGuild www.Twitter.com/PTBOTheatre www.YouTube.com/PTBOTheatreGuild --- Original message --- Subject: [Elecraft] RE50B microphone connected to K3 From: John Kountz j...@t6ee.com To: elecraft@mailman.qth.net Date: Saturday, 04/02/2012 11:12 AM Has anyone had experience in tying pin 3 to pin one in an XLR connector to enable the transition from a balanced microphone to the unbalanced input of the K3? In this regard I have used this arrangement to attach an Electrovoice RE50B to my K3 and, although I have made satisfactory contactswith this arrangement, I ask because many of you respondents appear experienced in audio and may have alternatives to making this interconnection. John Kountz, WO1S/T6EE 2 x K3s __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] RE50B microphone connected to K3
On 2/4/2012 8:42 AM, David Moes wrote: E50b is a low z dynamic mic that is well suited to voice and is an excellent mic should work well for K3. Yes. An RE11 or RE16 is even better, because they are directional and reduce background noise pickup (fans, room noise, etc.) To use this unbalanced you are correct to connect pin1 to pin3 (cold to ground) Yes, Pin 3 to Pin 1 is right, but Pin 1 is the SHIELD, not ground, and Pin One must go to the SHIELDING ENCLOSURE (the chassis) to provide shielding and prevent the Pin One Problem. The distinction between ground which some interpret (wrongly) as a connection to the EARTH, and a connection to the SHIELDING ENCLOSURE is important -- no connection to the EARTH is needed to prevent noise or RFI issues. do not connect the XLR connector body to the ground it should be left floating. Again, this word ground confuses the issue. Inside the microphone, there MUST be a connection between Pin One and the metal shell of the mic -- this provides shielding for the mic itself. AES Standards also call for a connection between Pine One and the shielding enclosure INSIDE EQUIPMENT, but require that there be NO connection between the cable shield and the cable shell. There are very important reasons for this that don't matter here. :) 73, Jim Brown K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] RE50B microphone connected to K3
You want to keep pin one separate ... Connect pin 3 to the microphone return in the transceiver (pin 7 in Elecraft/Kenwood transceivers) Connect pin 1 to the chassis - the *SHELL* of the Foster mic plug in most transceiver. If you do it right, you will use shielded twisted pair cable - the twisted pair will provide a high degree of hum/RF rejection and the shield will be the icing on the cake as K9YC likes to point out. Even though the transceiver mic inputs are not truly balanced, treating them as pseudo-balanced inputs with twisted pair cable and an isolated shield goes a long way to keeping things clean. Manufacturers like Icom and Yaesu that use a coaxial lead (shield is the return) for their microphone and then float the mic return across the emitter resistor in the mic preamp or an RF choke are asking for RFI and hum problems. When some third parties then recommend connecting the mic return to the shell of the Foster mic plug with the cut-off component lead they compound the problems by upsetting the bias of the mic preamp! 73, ... Joe, W4TV On 2/4/2012 11:12 AM, John Kountz wrote: Has anyone had experience in tying pin 3 to pin one in an XLR connector to enable the transition from a balanced microphone to the unbalanced input of the K3? In this regard I have used this arrangement to attach an Electrovoice RE50B to my K3 and, although I have made satisfactory contactswith this arrangement, I ask because many of you respondents appear experienced in audio and may have alternatives to making this interconnection. John Kountz, WO1S/T6EE 2 x K3s __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
