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<p>Hi,
<br>
<br>
Just my 2 cts: When Phil, VK6PH, presented his DFC idea at the SDR
Academy 2016 (HR Friedrichshafen) he spoke about a firehose to
fill the total amount of digital data (1. Nquist zone) directly
into a PC for processing. This is certainly an interesting
approach for (presently) frequencies up to 50 MHz. But e.g.
compared with HERMES I can't detect any benefit of the important
RF performance as the ADC/DAC is the limiting factor (IM,blocking,
phase noise etc.)
<br>
<br>
Our experience 7 years later: the promising development of the new
HERMES 2 providing two independent RX ports died on the way to the
layout of the board. Cheap derivates like Red Pitaya and Chinese
clones became the favorite SDR for homebrewing hams. The
industry's trend to higher bandwidths and microwave frequencies
created new RF transceiver chips with preamps, IQ-mixer,
RX/TX-synthesizer etc. on board. The AD9361 is covering 47 MHz to
6 GHz while der LMS7002 starts at 100 kHz up to 3.8 GHz at cost
far below USD 50. Microwave SDRs for ham application could be
built for less than USD 200. Excellent QO-100 satellite
communiction in full-duplex SSB mode is now possible for the ham
community covering at least one third of the world's surface.
<br>
<br>
Please don't forget, that nothing is more frustrating for a
developer, when after a long work no interest or application can
be generated.
<br>
<br>
73, Helmut, DC6NY
</p>
<div class="moz-cite-prefix">Am 13.04.2023 um 20:54 schrieb ad0es:<br>
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cite="mid:fab64982-a775-1cd5-2cf0-64ad5a593e94@ad0es.net">
<pre class="moz-quote-pre" wrap="">***** High Performance Software Defined Radio Discussion List *****
</pre>
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Hi all,<br>
<br>
I am in the final stages of prototyping a receive only version of
Minerva. The PCIe/FPGA/ADC parts<br>
are working. The final step is the design of an RF appropriate
front end. I'm afraid this is outside<br>
of my skill set...<br>
<br>
I would like the community's help in this design. Any
comments/suggestions/criticisms are welcome!<br>
I've put together a website with info and sample schematics:<br>
<br>
<a moz-do-not-send="true" href="https://ad0es.net/dfcADC/">The
website</a><br>
<br>
73,<br>
Steve AD0ES<br>
<br>
<br>
<br>
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