[hpsdr] Mercury and 28Mhz receive

[Riho B., ES7AAZ]

Absolutely agree with you, Phil.  Mercury itself is very clean. These 
spurs we see is a kind
of internal noise which passing through the chassis, coax shield,  
induced back to the Mercury.
It's clearly seen if I remove the clamp on choke which is right after 
Mercury input. Putting it
back these spurs are much smaller and noise level drops as well a bit.

So, antenna decoupling technique may help. (?)


73's,
Riho, ES7AAZ.


26.09.2011 15:29, Phil Harman kirjutas:
> Hi Mike,
> Just tested with all the latest versions of FPGA code, using Metis and 
> Doug's latest PowerSDR. With 50 ohms on the antenna socket of Mercury 
> then the only spur I can see is at 28.415MHz at  -130dBm on the 
> bandscope.  KK gives exactly the same result.
> 73 Phil...VK6APH

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