[Elecraft] MH3 Microphone Freq Response Improvement

[ke9uw]

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On May 24, 2015, at 6:46 PM, k9jri [via Elecraft] <ml-node+s365791n7603492h99 at n2.nabble.com<mailto:ml-node+s365791n7603492h99 at n2.nabble.com>> wrote:

I have a follow up to the modification:

On the air testing indicated that while the highs were improved some the bass was still excessive so another try was warranted.  I did find a helpful article correcting the same issue in the recent version Icom HM-36 which is a very similar mic.

I removed the shorting strap across the entire original RC circuit (2K with .3 in parallel) and also removed the original .3 SMD in parallel with the 2K resistor.  I then placed a .01 mylar in the same position that the shorting strap had used and the highs were increased significantly without changing the lows much at all.  This results in 2K with .01 in parallel for the frequency compensating network.

It receives good reports now and looks fairly full across the entire 3kHz. bandwidth my buddies panadapter is looking at.

My EQ settings are:
3.2 = 0
2.4 = +3
1.6 = 0
0.8 = 0
0.4 = -3
0.2 = -6
0.1 = -9
0.05 = -12

Very 73 - Mike - K9JRI



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Chuck, KE9UW
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