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#Bitx40 Mic Pre-amp MAX9812 #bitx40

 

Thought I would share some settings on playing with a mic pre-amp with the Bitx40.

I am using a MAX9812L

So far its working ok at best I sound a bit robotish.

The audio file is from Michigan to Milford PA websdr 

I am TXing at around 20w with my amp.

I took the audio out through a 10uf dc blocking cap to the bitx40 mic in.

I powered the board from a 9v just for testing.

R136 is about 1/4. If you use a pre-amp you should adjust this lower or you will cause one heck of a noise on tx.

I am not yelling or shouting to get audio out now but not sure I like the audio in any case.


--
David

 N8DAH
Kit-Projects.com

Charles D. Smith
 

What did the audio sound like without the pre amp?
72/73 de Chas ai4ot

 

I had reports of it being muddy. I will try and make another recording w/o it and try and get it posted when I have more time to play with it. Over all it seems to be an improvement but will have to find a way to add this to the audio chain if I want to continue doing digital. At the moment its just in the mic housing.
--
David

 N8DAH
Kit-Projects.com

 

This is w/o the pre-amp .....might just stick with the slight yell to get the audio out. I like the idea of not having to shout but do not like the audio from this version of preamp
--
David

 N8DAH
Kit-Projects.com