[hpsdr] QSD gain and noise.

[Phil Harman]

HI Ahti,

Thanks for your most informative feedback. I hope to find some time in 
the future to work on the ISD/QSD circuits. At the moment I find that 
the performance of the Mercury DDC receiver is so good that I don't 
feel inclined to move away from experimenting with it.

73's Phil...VK6APH



Quoting Ahti Aintila <oh2rz.sdr at gmail.com>:

> On 24/09/2007, Phil Harman <phil at pharman.org> wrote:
>
>> Are there any figures for the 180 degree QSD over the range 160m to 6m
>> i.e. are we sure that changing to 180 degree switching really fixes the
>> NF problem? If not then the H mode seems a better option.
>>
> Phil,
> Based on quick experiments that remained undocumented more than a year
> back, I only can say that the frequency response falls down sooner


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