[hpsdr] Fwd: Hpsdr Digest, Vol 204, Issue 2

[Helmut Oeller]

Hi guys,

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.)

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.

Please don't forget, that nothing is more frustrating for a developer,
when after a long work no interest or application can be generated.

73, Helmut, DC6NY


> ***** High Performance Software Defined Radio Discussion List *****
>
>
> Hi.
>
> Phil Harmon VK6PH was the lead:
>
> Video presentation <https://www.youtube.com/watch?v=Ob4o8vrC4yM>
>
> If you look in the archives you can find entries in the 2018 timeframe.
>
> Something totally hosed my website link, it should be:
>
> https://ad0es.net/dfcADC/
>
>
>
> On 4/14/23 1:14 PM, Bob Stricklin wrote:
>> Hi Steve,
>>
>> I sent a reply via HPSDR but got a notice it was being held for some
>> reason so sending direct.
>>
>> Bob N5BRG
>>
>>> Begin forwarded message:
>>>
>>> *From: *Bob Stricklin <bstrick at n5brg.com>
>>> *Subject: **Re: Hpsdr Digest, Vol 204, Issue 2*
>>> *Date: *April 14, 2023 at 7:46:15 AM CDT
>>> *To: *hpsdr at lists.openhpsdr.org
>>>
>>> Steve,
>>>
>>> I do not recall what the goal of Minerva was going to be? This is
>>> not on the list of HPSDR projects that I see. Can you update me/us
>>> on this or post a URL to a description?
>>>
>>> For the RF consider adding a connector to a PCB and use the
>>> Cariiboulite-6G-01 from Crowd Supply. This is an RF capable board
>>> that can work up to 6 GHz which normally plugs onto a RPi. It should
>>> work with other processor bases.
>>> The advantage is the board is available at a modest cost, it is
>>> built and tested, an FPGA is included so it is possible to customize
>>> the verily for many applications. The design is open source and the
>>> chips are apparently available.
>>>
>>> You may also do a similar thing with an RTL-SDR but not have the
>>> level of flexibility the Cariboulite would offer.
>>>
>>> Bob
>>>
>>>> ----------------------------------------------------------------------
>>>>
>>>> Message: 1
>>>> Date: Thu, 13 Apr 2023 12:54:26 -0600
>>>> From: ad0es <ad0es at ad0es.net>
>>>> To: hpsdr at lists.openhpsdr.org
>>>> Subject: [hpsdr] Phoenix
>>>> Message-ID: <fab64982-a775-1cd5-2cf0-64ad5a593e94 at ad0es.net>
>>>> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>>>>
>>>> Hi all,
>>>>
>>>> I am in the final stages of prototyping a receive only version of
>>>> Minerva. The PCIe/FPGA/ADC parts
>>>> are working. The final step is the design of an RF appropriate front
>>>> end. I'm afraid this is outside
>>>> of my skill set...
>>>>
>>>> I would like the community's help in this design.? Any
>>>> comments/suggestions/criticisms are welcome!
>>>> I've put together a website with info and sample schematics:
>>>>
>>>> The website
>>>> <https://url.emailprotection.link/?bfl3Wn4SkzMeF9dpnddV7H2vEGHr9gP4nAOU4pT4IZd7GYKsjyYvjfZKiSbpUzVFpW-u-8OlGy0UMQp5gW3cptA~~>
>>>>
>>>> 73,
>>>> Steve AD0ES
>>>>
>
>
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