¿ªÔÆÌåÓý

  1. BITX20
  2. Messages
Single Messages Topics Expanded Polls

Re: I need a V3 or V4 uBitx board.

 

Joel :

Try putting a .01 uF cap in series with a 1.8K Ohm resistor between pins 1 & 5 of the LM386 on your "Slop Bucket".
That should get rid of most of the high frequency hiss on the LM386 without impacting SSB reception.

This is a N6KR (Wayne Burdick) trick; a little used feature of the LM386 called BASS Boost.
The values I specified are those that are used in Norcal 40a.

I made the same mod to my BITX40 and it works great on both SSB and CW.

Cheers

Michael VE3WMB?
Join [email protected] to automatically receive all group messages.