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I see three basic areas......... 1) The standalone SR-40 based unit without a "large external computer". Similar to the "futures...." project which George mentions (and what "made" me subscribe to

Power DDS I think a much better solution for experimenters would be to define a software interface and implement a call to a dll which would do the hardware interface. This dll could be changed

Checkout the AMQRP Micro 908. It contains a DSP card, a DDS board, a processor, a tuning knob, 2 X 16 LCD and connectors for audio in/out, a keyboard, and an RS-232 port. Dave - WB6DHW

That's certainly the idea. See http://www.amqrp.org/kits/softrock40/futures.html which is also elaborated on in a current Homebrewer Mag article. The prototype is now much further along than either

Cont......... The next step would be standalone DSP+ with a 2x16 backlit display and tuner knob with shaft encoder. The one following that has a simple (and separate ...don't require a computer to

Design list......... What I would like to see is a SR-40 with Rocky software (could be Power SDR at the expense of CPU cycles) and the following changes. Add an AD9850 DDS with parallel port loading

Both the Drake R-4c and Yaesu FT-101 used switched banks of variable caps to tune the permeability tuned inductors for each band. Here is a discussion thread about the difficulties of designing a

Hi all, I just posted a new version of the SharpDSP Mini Console for the SoftRock 40 to my website at: http://www.philcovington.com/SDR.html Please see my Blog entry for 10-19-2005 for details

AD8333 - LF - 10 MHz Dual I/Q Demodulator and Phase Shifter Data sheet available on Analog Devices web site. This might be the basis of a future design. (?) Stan AK0B

Hi Tony and all Toroids in the BPF are better than tha former inductors as maybe the higher Q can help some the filter. In my observation (region 1, middle-east) there are definitly 'leakages" on

Rocky 1.04 works with the Windows ME operating system. Prior to that version I was getting the message about Sound Blaster Live not working on output. It's working now. Great program, especially

Good Morning All, There have been a number of good comments concerning the v5.0 schematic. Those comments along with my own concerns about certain things in the posted schematic have motivated me to

Tony the phase shift network looks awful simple, how wide a frequency range can it take before it is too far out of wack. Specially since the Rocky software is the only one at this time that

I think he is passing the one clock through the switch that is controlled by the other clock, I think it is to prevent overlapping clocks without using extra gates. Cecil

Hello Tony and all Please make the antenna input floating (so the filter ground is not connected to the rest of the ground of the RS), otherwise it is a major groundloop noise contributor!! (at least

Hi Lyle, Two of the bus switches in the pack of four are used to enable the quadrature clocks to the control lines of a two switch QSD circuit. The two switches are used to mute the RX function by

I'm a little mystified by the switch control logic in the mixer. The FST3126 data sheet indicates the control inputs are pins 1, 4, 10 and 13 and that these need logic level drive. The logic level

Good Evening All, I have posted in the Files area a schematic of the V5.0 SoftRock. I am working on the board layout but am quite willing to make changes that would make the v5.0 more useful to the

The sound is a little better, but still not good. The input is still reading +6db both L & R. Still reads the input as mono, the auto I Q Balance does not work. Oh well, guess this 24 Bit External

Looks good Chuck. I read about a 34dB difference between the two RF input levels. This corresponds well to the voltage ratio of 50. Also note the baseline noise is about 30dB below 1uV RMS. This