[Elecraft] My KX3 desk microphone project

[Gary - NC3Z]

Provides more gain and improves the SNR.

Gary Mitchelson
NC3Z Davidsonville, MD FM18
NC3Z/4 Pamlico County, NC FM15
www.mitchelson.org

On 1/23/2015 7:33 PM, Gary K9GS wrote:
>
>
>>
>>
>> Just curious...what is the point of paralleling 4 microphone elements?
>>
>>
>> On 1/22/2015 10:44 AM, Gary - NC3Z wrote:
>>> I wanted a desk mic to go along with my KX3 station. Wanted 
>>> something more portable than the Heil boom and mic I use on my other 
>>> radio. I have experimented with dynamic mics on the KX3 and didn't 
>>> get the results I liked but did get very nice results with using 4 
>>> CUI electret condenser mic elements in parallel. I used the CUI 
>>> CMA-4544PF-W from Digikey and used a small project circuit board to 
>>> physically arrange them in a 2 x 2 config. Then I trimmed up the board.
>>>
>>> For the mic body I found a unused Shure 522 on ebay (some company 
>>> had them for a conference table system and had a great price). The 
>>> 522 has an adjustable neck height and a PTT (with lock). I gutted 
>>> the body and fitted the new electret element assembly as well as 
>>> used a 3' TRRS patch cable that I cut 1 end off for the mic cable, 
>>> it also had 90 deg ends.
>>>
>>> I am pleased with the physical results as well as very good audio 
>>> reports I am receiving from the regulars that know my signal, still 
>>> not to the level of my FTDX5000MP but getting better with each tweak 
>>> and DSP update (using 1.32 which has made a noticeable improvement). 
>>> I am using a healthy level of compression and mic gain that shows a 
>>> solid 5 bars.
>>>
>>
>>
>> -- 
>> 73,
>>
>> Gary K9GS
>>
>> Greater Milwaukee DX Association: http://www.gmdxa.org
>> Society of Midwest Contesters: http://www.w9smc.com
>> CW Ops #1032   http://www.cwops.org
>>
>> ************************************************
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