It is possible he’s trying a dynamic microphone
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On Mar 9, 2025, at 12:23, K9HZ via groups.io <bill@...> wrote:
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Bad mic. ?Is drawing the bias provided by RD21 down from 11.9v to 2.1V.?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
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Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois
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Owner – Operator
Villa Grand Piton - J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
email:??bill@...
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On Mar 9, 2025, at 9:03?AM, WF4RC Carroll <WF4RC@...> wrote:
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I have a new sBitxV3 board only. Everything is working except the Mic input. I started experimenting with some microphone I had and the recorded transmission has lots of noise and very low audio. I measure 2.1v on mic input tip. I think it should be 5v. Can anyone guide me as to what the issue may be and where I should look. Here are my measurements/ calculations.?
