41641Re: [softrock40] Re: An Idea, tell me what you think:
- Mar 2, 2010Hi all,
Just to chime with my two cents :)
> There is a "black hole" in the ham kit/product market it is theVFO.
> What is needed is a VFO kit (DDS or Si570-based) with an actualfour
> "spinner" knob that covers near DC through 120 MHz (for divide by
> PC-based SDR's) or at least near DC through 75MHz for dualconversion
> superhets with 45MHz first IF and 455kHz second IF. There isnothing
> like this out there. We have ADI9834/5-based knob VFO's that gothrough
> 34MHz or 21MHz with pretty lousy SFDR, then there are the AD99XXDDS's,
> expensive and I don't know of one with a tuning knob."spinner".
> Yes I know about KB5CQ's Si570 tuner/display, it is not a
>The firmware developed for the Mobo 4.3 includes a rotary encoder enabled, variable speed VFO. The firmware, while tailored towards the Softrock 6.3 / Mobo 4.3, can easily be adapted to any other platform, and all source code is free for use and rework, as long as it is not for commercial purposes. What I'm alluding at, is that if anyone wants to make a standalone VFO project based on the Si570, then you are welcome to use the Mobo 4.3 firmware as a base. It runs on any Atmel 8bit USB enabled Microcontroller (AT90USBxxx, ATmega32Ux..., virtually unchanged. Only addition needed is a Si570 and a decent Rotary Encoder and a nice heavy VFO knob.
http://groups.google.com/group/MOBOKITS (you need to be registered, but anyone is welcome)
The SDR Widget project which has also been mentioned a few times here on the softrock40 list, will include the full Mobo 4.3 firmware functionality, in addition to being a high quality 192kb/s 24 bit audio card, eliminating the need for anything other than one USB connection between the SDR and the PC. Who knows, it may also evolve into providing direct DSP audio processing, we'll see :))
This project, while still in its infancy, already has a working USB composite device consisting of a set of DG8SAQ/Serial/HID/Audio devices (no small feat, singlehandedly by Alex, 9V1AL). As this is a volunteer group effort by a number of dedicated radioamateurs, we expect to have a working configuration ready in a few months. Ohh, and yes, it includes a VFO :))
73 de Loftur, ve/tf3lj2010/3/2 Lieuwe De Vries <lieuwe.devries@...>
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