test -- Eric P. Nichols, KL7AJ, NNN0AKA, WD2XSH/27 P.O. Box 56235 North Pole, AK 99705 (907) 488-0483 [email protected] [email protected] [email protected] http://ericnichols.net On Saturday 20 November 2010 09:04:51 am Joe Subich, W4TV wrote: > > It's a very old broadcast engineering technique that we both > > remembered. I've used the series capacitor when I wanted to use other > > pro mics with ham rigs that lacked mic EQ, and it worked quite well. > > In this case, the value is chosen in conjunction with the shunt > resistor to provide the 16 to 20 dB pad to bring the CM-500 level > down to something more like what Yaesu expects to see. It provides > a dual function ... both level matching and response shaping. > > > The cap is for LF rolloff, not DC blocking (which is not needed). > > It's not needed for blocking in Yaesu rigs. However, some other > manufacturers do not include a blocking capacitor and failing to > include one in a "DC adder" for an electret mic (or FET preamp) > can upset the bias of the rig's mic preamp. > > 73, > > ... Joe, W4TV > > On 11/20/2010 12:35 PM, Jim Brown wrote: > > On 11/19/2010 6:23 PM, Luis V. Romero wrote: > >> These Orions are really bassy. > > > > I understand. Makes you appreciate the K3 even more -- no need for the > > W2IHY unit, or for external EQ. > > > > Take a look at the simple circuit that Joe, W4TV, posted yesterday. > > It's a very old broadcast engineering technique that we both remembered. > > I've used the series capacitor when I wanted to use other pro mics with > > ham rigs that lacked mic EQ, and it worked quite well. You'll see that > > in the Ham Interfacing tutorial that I posted to my website several > > years ago. The cap is for LF rolloff, not DC blocking (which is not > > needed). The only trick is finding the small cap needed to fit inside > > the connector. > > > > 73, Jim K9YC > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[email protected] > > > > 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:[email protected] > > 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:[email protected]
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