[Skimmertalk] new red pitaya

[Jeff Blaine]

Bob,

Yes, sorry about the P/N.  XG3.

No conclusion that would be useful to the rest of the guys here. Just 
mentioned it as a tool to get objective certainty dialed into the test 
setup when evaluating this or that config.

Here, I used it last to test the sensitivity of a softrock-based 80m 
skimmer a couple of days ago.

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

On 6/3/19 7:33 PM, Bob Wilson, N6TV wrote:
> I think you mean the Elecraft XG3
>
> https://elecraft.com/products/xg3
>
> I didn't know it could generate RTTY.  That's nice.
>
> What was the conclusion of your tests?
>
> 73,
> Bob, N6TV
>
>
> On Mon, Jun 3, 2019, 5:21 PM Jeff Blaine <KeepWalking188 at ac0c.com> wrote:
>
>> 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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