[hpsdr] Orion MKII board - Hermes board

[georg Prinz]

Hello Scott,
thank you for your explanation. I am still on the Atlas platform and 
didn`t care about hpsdr. This will change now.
73, and happy New Year
Georg


On 02.01.2019 15:01, Scott Traurig wrote:
> Georg,
>
> There has been a progression of SDR boards since Hermes. Next there 
> was the Angelia, then the Orion, then the Orion MKII.
>
> They are all essentially the same architecture with minor but 
> significant changes.
>
> The largest difference is that all of the successor designs have a 
> second ADC channel available that is phase locked to the first ADC. 
> Both PowerSDR and Thetis clients support coherent beamforming using 
> this feature (labeled "diversity" in the software).
>
> The Orion and Orion MKII share the same but much larger FPGA and 
> increased on-board memory. They also boast improved phase noise and 
> clock stability compared to the Hermes resulting in improved IMD on 
> transmit and improved RMDR on receive. Both boards also include an 
> on-board coupler and switching for improved linearization performance 
> with the PureSignal linearization processing built into PowerSDR and 
> Thetis.
>
> The Orion MKII has a few tweaks that give it a slight edge over the 
> Orion. In particular the ADC preamp has been changed to a 14dB gain 
> part instead of the 20dB part used on predecessor boards. And the RF 
> output level is now controlled by a combination of step attenuator 
> (1dB steps) and the DAC reference voltage (fractional dB steps) 
> instead of only using the DAC reference voltage. Also, the Orion MKII 
> firmware allows control via SPI for a second set of preselectors on ADC2.
>
> That's it in a nutshell.
>
> You will find a lot more current news and information here: 
> https://apache-labs.com/community/index.php
>
> 73,
>
> Scott/w-u-2-o
>
> The Orion MKII



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