发件人: "pcovington .";<
p.covington@gmail.com>;
发送时间: 2015年11月10日(星期二) 晚上11:17
收件人: "skimmertalk"<
skimmertalk@contesting.com>;
主题: [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 1.2V 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
