IQ calibration 05.01 not possible. Why?

[Henk de Vries]

Hello,

I want to calibrate Linrad 05.01.

So hooked up a signal generator to the 2 inputs of my IQ+.

The UADC4 output is clearly seen/heard in Linrad.

So far, so good.

When I want to calibrate the IQ amplitude (X-C-A) I see both signals.

Both having the same amplitude.

However I either get the message "signal too weak" or OVERLOAD. 

A/D 0, 1 and 3 are changing color from red to white when I increase the input signal dBm and get a value.

However A/D 2 remains red and has a value of almost zero.

So that is most probably the issue.

Anyone who can tell me how to solve this calibration problem?

73 Henk

PA0C