[ICOM] re using shure 444D dynamic mic with IC-761

[Larry Young]

Fern, The 444D mike is a high impedance or low impedance mic depending on the switch setting on the bottom of the mike.I believe the 761 has a 600 Ohm audio input impedance, so the 444d if it will work should be in the low impedance setting. You definately should use a series DC isolating capacitor in the mic input line.
Larry K4LXV

--- On Tue, 1/19/10, D C *Mac* Macdonald <k2gkk at hotmail.com> wrote:

From: D C *Mac* Macdonald <k2gkk at hotmail.com>
Subject: Re: [ICOM] re using shure 444D dynamic mic with IC-761
To: "Icom Forum" <icom at mailman.qth.net>
Date: Tuesday, January 19, 2010, 10:38 PM


Did you try your dual impedance mic in both modes?
 
73 - Mac, K2GKK/5
Oklahoma City, OK



> From: crc at cyberlink.bc.ca
> To: icom at mailman.qth.net
> Date: Tue, 19 Jan 2010 20:11:42 -0700
> Subject: [ICOM] re using shure 444D dynamic mic with IC-761
> 
> I have tried using the shure 444d dynamic desk mic with my newly acquired IC-761 but I am not happy with the transmit audio. It has too much bass/too much bottom end. I initially tried an electrolytic cap of 4.7 mfd (as suggested) to isolate the mic element from the mic input of the radio. I then changed that coupling cap to 0.22 mfd which helped some but still not good enough communications audio. I would like to hear from anybody who's played with that and has an answer for me please.
> 73 from Fern                           
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