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I've got $1 ebay USB sound cards and they work fine for the VOX,the only problem I have is the radio is deaf and wont go on freq no matter what but atleast the VOX works
Thanks for the info, I ordered the $10 unit.
On Sat, Jul 27, 2019 at 5:57 PM Adam Rong <rongxh@...
The newer generation built-in sound card has to meet an European hearing protection standard EN50332 and the max output voltage will not exceed 150mV on a 32 ohm load. This is the reason why they cannot drive D4D as the VOX circuit requires 600mV. However, we can easily find other USB sound cards, such as the $25 Creative SoundBlaster Play3! and the $10 one I am offering at http://crkits.com in D4D Frequencies and Options drop down menu. The background noise and interference pickup are both very important, and these two are qualified for FT8 operation per our test.
Before you make a purchase, please make sure you have pushed both Pwr and system volume to max. Also, make sure you are controlling the correct sound card. If you find your sound card cannot drive VOX at all or cannot drive constantly, you can consider the sound card purchase.