When you own a ICOM 2800H with the HM98 mike , use this nice trx in the mobile like i do, receive sometimes complains about the hollow modulation and pick up too many backgroundnoise ? Then maybe this is the solution too eliminate this problem.
Solder a capacitor between 10 - 47 nf paralell on the mic-element.
If you opened the HM98-mike , you can see that the audio cannot applied properly to the mike-element .
To change that , you've too drill a small hole of 1mm so that the audio is applied into the center of the mic-element.
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