[hpsdr] Sensitivity of dual mercury system differs significantly

[Georg Prinz]

Hello Michael,

I load some pictures into www.qsl.net/dl2kp/.
 
The transverter is in dir dual_tvr_2m. It is built with components
from Kuhne electronic. The splitter for the oscillator is home made.
The oscillator will be synchronized from Excalibur/rubidium osc.hpsdr.
At the backplane you see the RX/TX relais and another relais to 
switch from one- to two-cable antenna system. On the left side there is
a driver PA with 100W and the Sequence-controller.On the right side
there is the switched power supply S-400 and the power distribution
panel. The two Transverter Modules MKU 144 G2 are beneath the Oscillator
and Splitter. As the system is under test, the cables are not sorted,
hi.

My actual hpsdr system is in dir hpsdr_dual_rx_2014_06_05. I removed one
mercury, so it is now a dual system. On the left side the boxed munin PA
with two blowers. The relais beside munin is necessary to switch
Penelope output between Munin and Transverter. The relais is switched
manually at the back plane. On the right side the switched power supply
and the voltage regulators for atlas supply.

73, Georg, dl2kp






Am Donnerstag, den 05.06.2014, 14:09 +0000 schrieb Owen, Michael:
> Dear Georg,
> 
> I am also working on a dual transverter system; mine is based on Angelia.  The transverter is not finished yet so I have nothing to offer.  Please continue to post your observations.
> 
> 73,
> W9IP
> 
> 
> -----Original Message-----
> From: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of georg Prinz
> Sent: Thursday, June 05, 2014 10:03 AM
> To: hpsdr at lists.openhpsdr.org
> Subject: [hpsdr] Sensitivity of dual mercury system differs significantly
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> 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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