[hpsdr] Sensitivity of dual mercury system differs significantly

[georg Prinz]

Hello,

during my initial tests with my dual transverter system on 2m, I 
realized that my dual mercury system
with Metis has unequal sensitivity.  The difference between mercury one 
and two is about 20dB (measured
without Alex after running through the calibration routine). The 
attenuation for RX1 and RX2 is set to 0dB
in PowerSDR  mRX PS v3.2.9(2/23/14). The two mercuries are
set up as Joe(K5SO) proposed for a clock feed of two mercuries.

Did anybody encounter something similar? What could be the reason?

Furthermore, I have another testsystem with OZY and one Mercury on my 
workbench. This system shows
a noisefloor at about less than -130dBm, visually. My above mentioned 
dual system has a noisefloor at about -110dBm
on both receivers. I have no explanation why a dual system should be 
worse. Any idea?

73, Georg, DL2KP


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