[App_rpt-users] USB sound FOB lack of high frequency noise

[Skyler F]

I figured out the problem : Even though I was hooking my audio directly
into the mic input of the CM108 chip, a low pass filter was clamping all
the high frequency signals to ground, I just had to desolder an L5 as this
link shows:

http://m3h.com/usbfob-119.pdf

I was looking at other guides, which had sound fobs with no low pass filter
already in it.

kdw0hb


On Tue, May 3, 2016 at 8:34 AM, Skyler F <electricity440 at gmail.com> wrote:

> I just put together a modified sound fob by taking a 10µF capacitor to the
> divider of 47k and 68k resistors and then to the microphone input of the
> sound fob, but I am getting the lack of high frequency noise error when I
> plug my fob into the radio. A DMK URI works fine. Has anybody else had
> problems with these sound fobs?
>
> 73
> kd0whb
>



-- 
Skyler Fennell
amsatnet.info
KDØWHB
electricity440 at gmail.com
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