[hpsdr] PureSignal for HPSDR/Penelope/Mercury

[Helmut Oeller]

Hi,

the development of PS started more than 10 years ago and was set up for
the Hermes board. Note that Hermes has only 1 physical frontend, but the
large FPGA  can contain several DDCs (digital down converter), which are
simultaneously fed on the ADC data. A common sampling oscillator
supplies the ADC as well as the DAC, i.e coherence is given.

George nicely listed all important reasons, why Atlas based HPSDR boards
can't use PS together with PowerSDR PS or Thetis. Nevertheless FYI: My
friend HB9EPU, an exceptionally gifted coder operates his own algorithm
of digital predistortion successfully using 2 Mercuries and a Penelope.
Minor Hardware mods for coherence were necessary, but the whole setup
runs in his individual Linux environment. All is possible, hi.

73, Helmut, DC6NY

Am 28.05.2023 um 15:12 schrieb Jim Sanford:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Good information, thanks.
>
> I would GLADLY install a second Mercury to do this.  Since I have
> everything referenced to GPSDO, I would think the phase matching would
> be close.  Bus limitations would be an issue, no doubt. Would love to
> see an attempt.
>
> Wonder if a single Mercury could be set to switch to a receive input
> coming off the PA sample port, only requiring 1 Mercury board.  (I
> THINK!)
>
> Thanks & 73,
>
> Jim
>
> wb4gcs at amsat.org
>
>
> On 5/28/2023 07:44, George Byrkit wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> While it might be technically possible, there are lots of hurdles to
>> overcome, and PureSignal was not designed/implemented to work on the
>> Mercury
>> receiver.
>>
>> 1) PureSignal needs an additional phase/clock-synchronous receiver
>> channel
>> to get the feedback to correct the signal.  Mercury only has ONE
>> receiver
>> channel.  You'd have to hand-stack multiple Mercury boards to begin
>> with...
>>
>> 2) PureSignal needs more FPGA memory space for code and everything.  A
>> Cyclone III doesn't really have that available for you.
>>
>> 3) perhaps bus timing and all are also in the way.
>>
>> You should reach out to Dr Warren Pratt, NR0V, who implemented
>> PureSignal.
>>
>> 73,
>> George Byrkit, K9TRV
>>
>> -----Original Message-----
>> From: Hpsdr <hpsdr-bounces at lists.openhpsdr.org> On Behalf Of Michael
>> Carey
>> Sent: Sunday, May 28, 2023 4:57 AM
>> To: hpsdr at lists.openhpsdr.org
>> Subject: [hpsdr] PureSignal for HPSDR/Penelope/Mercury
>>
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