The Shire SM58 mic is a Dynamic mic and does not require bias (required only for electret mics).
Sent from my iPhone ...nr4c. bill > On Oct 6, 2017, at 7:27 PM, Richard Day <rich...@richdayhealthplans.com> > wrote: > > Why did you turn the mic bias off? Have you tried turning it on to see if > it gives you the sound you need? > > Rich > KK4DZE > >> On Fri, Oct 6, 2017 at 12:27 Joe Subich, W4TV <li...@subich.com> wrote: >> >> >>> On 10/6/2017 11:36 AM, Jim Brown wrote: >>> I'm with Bob on this. While the K3 and K3S DOES have a Pin One >>> Problem at the rear panel mic input (the cable shield goes to the >>> chassis through a capacitor), floating the cable shield is not a good >>> solution, and it should be tied to the connector sleeve. >> That may work with the K3/K3S which have a relatively low impedance >> between the mic return and chassis. Tying the shield to mic return >> is a complete disaster on older rigs (FT-1000D, FT-1000MP, most Kenwood, >> etc.) where the mic return is the emitter of the mic preamp which has >> an *unbypassed* resistor and/or RF choke to DC return/chassis. That >> [relatively] high RF impedance is like connecting an antenna directly >> to the mic. >> >> 73, >> >> ... Joe, W4TV >> >> >>> On 10/6/2017 11:36 AM, Jim Brown wrote: >>> I'm with Bob on this. While the K3 and K3S DOES have a Pin One Problem >>> at the rear panel mic input (the cable shield goes to the chassis >>> through a capacitor), floating the cable shield is not a good solution, >>> and it should be tied to the connector sleeve. >>> >>> When a rig DOES provide chassis at the mic connector, the balanced mic >>> lines should be wired to MIC+ and MIC-, and the cable shield should be >>> tied to the chassis. In general, it's also OK to tie Pin 1 and Pin 3 >>> together AT THE RIG and connect them to the chassis. >>> >>> 73, Jim 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 Message delivered to arch...@mail-archive.com