[Elecraft] KX3 and the Sigmalink USB

[Bob McGraw K4TAX]

If you look at the jumper configuration in Fig 2 & 3 of the Signalink 
USB documentation, you can insert the capacitor, in place of the 
jumper,  between the MIC pin on JP1 and the corresponding Mic Input 
terminal on JP1.   A 0.1 mfd 50 V disk ceramic should be very 
adequate.   That will block the DC bias from the radio and keep it from 
saturating the output transformer T2

The schematic is available  at this link.

http://www.frenning.dk/OZ1PIF_HOMEPAGE/images/Tigertronics%20Signalink%20USB%20Schematic%20v1p2.pdf

73

Bob, K4TAX



On 6/8/2019 12:47 PM, Terry Basom wrote:
> The SLMODKX3 jumper module for using the Signalink USB with a KX3 or KX2,
> has a DC blocking capacitor built in.
>
> Can anyone tell me where it is in the circuit and a value? It eliminates
> turning off the mike bias in the menu when using the Signalink USB. I am
> just using jumpers and would like to put in the capacitor to eliminate
> having to turn off mike bias and having to remember to turn it back on.
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