[Skimmertalk] new red pitaya

[Jeff Blaine]

Trying to figure out the impact of changes to my skimmer setup drove me 
nuts as there was no stable method to test at a system level the mods.  
Eventually I found a solution - the Elecraft KG3 sig gen.  A feature of 
that device is the ability to program CW (and RTTY) including a CQ 
sequence which can be read by the skimmer.

Given the stable source, the skimmer's SNR is stable to the dB level and 
precise incremental change  observations are possible.

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com

On 6/3/19 6:50 PM, Bob Wilson, N6TV wrote:
> On Mon, Jun 3, 2019 at 2:46 PM Andy KU7T <ku7t at ku7t.org> wrote:
>
>> How good is it compared to the old pitaya or QSR1 (SNR difference, more
>> spots, …)?
>>
> I little bit better SNR, but the main advantage is 16 192 kHz slices vs. 8
> max with the old board, plus no need for a 14:1 Impedance Transformer.  I
> will say at first pass the new board seemed to be reading signals 1 S-Unit
> LESS than the old board, feeding both from the same antenna/preamp via a
> passive splitter.  But the noise level was reduced even more, so the S/N
> went up.
>
>> Do we still need a preamp for higher bands?
>>
> In theory, no, but I think I'll keep mine in line anyway as my VE3DO loop
> isn't very sensitive above 40m.
>
>> Are you running it currently at N6TV-#?
>>
> Not yet.  Soon.  I just did brief standalone testing.  I have to do some
> reconfiguration to move the new board to my old case.
>
> I do wish the RBN Aggregator could be enhanced to auto-start two
> independent instances of CW Skimmer Server, something that is required to
> make full use of all 16 slices of the new board.  Skimmer Server /
> HermestIntf only permits 8 bands max per instance, so you need two
> instances, each connecting to a different MAC address.  Aggregator can only
> start one CW Skimmer Server.   I always have to start the second one
> manually.
>
> 73,
> Bob, N6TV
>
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