Re: TDA2228M

Jerry Gaffke
 

Here's a schematic:  http://www.hfsignals.com/wp-content/uploads/2017/12/ubitxr3.png

You might try adjusting the BFO within the menus.
See step 3, "Setting the BFO":  http://www.hfsignals.com/index.php/ubitx-tuneup/

The VFO does not track while moving the BFO, so any incoming station quickly becomes unintelligible.
So set the BFO for lower frequencies, then leave the menu (by hitting ptt) and retune.


On Tue, Mar 13, 2018 at 10:57 am, ae1ct1998 wrote:
I WAS GIVEN A MICROBITX 40 RADIO WITH A BLOWN TDA2228M CHIP. I REPLACED THE CHIP AND NOW I HAVE AUDIO BUT ITS VERY LOW AND THERES A HIS ON THE HEADPHONES, MY QUESTION IS DOES ANYONE KNOW WHERE I SHOULD LOOK TO TRY AND FIX THIS ISSUE. I CAN HEAR STATIONS BUT THERE IS NO MID OR LOW RANGE JUST HI'S. IVE TRIED TO FIND A SCHEMATIC FOR THIS RADIO ON LINE BUT THE ONLY ONE I CAN FIND IS PRINTED WITH VERY LITE INK, NOTHING READABLE. ANY HELP WOULD APRECIATED.

GARY
AE1CT

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