[Skimmertalk] QS1R replacement

[Igor Sokolov]

Phil,
I will gladly purchase updated version of QS1R. Please count me in for 1 
unit.

73, Igor UA9CDC
----- Original Message ----- 
From: "pcovington ." <p.covington at gmail.com>
To: <skimmertalk at contesting.com>
Sent: Tuesday, November 10, 2015 8:17 PM
Subject: [Skimmertalk] QS1R replacement


> Hello all,
>
> I am trying to get an idea of the demand for an updated QS1R I am
> working on.  The price target is $499.
>
> Here are the changes:
>
> 1. It will have the same size FPGA as the current QS1R, but the FPGA
> will be upgraded to a Cyclone IV instead of a Cyclone III.  This will
> reduce power demand, heat, and resolve some of the timing issues some
> people have had with the QS1R in Skimmer Server duty.
>
> 2. The ADC will be updated to a lower power version with the same SFDR
> as the current ADC. This will result in less heat production.
>
> 3. The regulators will be updated to a 3A version for the 1.2 volt
> supply and 2A versions for the rest of the supplies.  There is an
> issue in the current QS1R where the 1.2 V 800mA regulator goes into
> shutdown on some units when running Skimmer Server.  The heating of
> the 1.2 regulator will be much less also.
>
> 4. There will be a clock generator that generates the 125 MHz encode
> clock from an on board 10 MHz oscillator and the option to supply the
> clock generator with an external 10 MHz source without having to mess
> with any solder jumpers.  This eliminates the 125 MHz external clock
> requirement.
>
> 5. A preamp/ADC driver will be added with a −11.5 dB to +20 dB gain
> range.  This is the same part that is used in the Flex 6700.  This
> part was not available when the QS1R was designed in 2007.
>
> These changes are specifically for Skimmer Server use.  As some of you
> may know, Skimmer Server was developed after the QS1R was designed and
> in production, so the high power demand was not anticipated.   Alex,
> VE3NEA did an amazing job of fitting 7 receivers into the current
> FPGA.  Skimmer Server taxes the voltage regulators (especially the 1.2
> V regulator) and the FPGA in the current QS1R.
>
> Please let me if you have any interest in the updated QS1R (model
> number/name TBD).  I am trying to plan a production run.
>
> 73 Phil N8VB
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