Modern HF XCVR design & digital signal processing.

[KU5Q]

I've developed a renewed interest in digital signal processing and modern HF, VHF & UHF XCVR design. Although not directly related, I've worked with some very early DSP used in ECM some years ago on a technical/maintainer level, not a circuit design level.

I've been reading some of the material Sherwood has on the subject as far as HF XVCR's. I've been searching for, and finding more information.

Can anyone recommend any online forums, perhaps some that are more in the commercial radio realm, rather than the ham radio realm? Not looking for a place to actively interact, debate, etc, just read only.

I've been finding the XK2100 a very interesting piece of gear. Dr. Rohde seems to have done a lot of work in these areas, and some helpful folks have turned me on to some information he has produced.

Thanks for any insight you may care to provide.

W3VR

[KB3RHV]

I would look at the companies that are making the DSP's and DSP cores.

Xilinx
Altera
Actel
Texas Instruments
Analog Devices

There are some good app notes on these sites on signal filtering. The one group I work with at work, uses the embedded DSP's in the xilinx FPGA's for there bit sinks.

[AG3Y]

Have you considered scanning for some "White Papers" on the IEEE web pages ?

Just a thought.

[VK2TIL]

There is a lot of interest in Software Defined Radio (SDR) these days;

http://en.wikipedia.org/wiki/Software-defined_radio

A Google for "Software Defined Radio" should help.

Experimental Methods In Radio Frequency Design covers a lot of the ground, mainly in DSP; there is an EMRFD Group on Yahoo.

[AG3Y]

One of the least expensive ways to experiment with an SDR is to get one of the "softrock" klts. You have to wind a toroid or two, and install some tiny surface mounted devices ( SMD ) but the results are worth the effort!

You can use the same software as the much more expensive SDR radios, and get a fair idea of how they actually work !

Have fun learning ! 73, Jim

[KU5Q]

Have you considered scanning for some "White Papers" on the IEEE web pages ?

Just a thought.

I have already found quite a bit of information since the first inquiry here.

I worked with digital signal control/processing as recently as 1980. In short summary, the technology was quite expensive and what I had seen at the time was primarily in military and high end commercial applications. However, as with many things, technologies have improved and come down in cost. There is little money in "ham" gear.

My research has shown me that none of the "ham" stuff is "cutting edge", and also none of it needs to be for the needs of the consensus. The market bears this out.

Thanks for your reply.