[NLRS] SDR-40

[Duane - N9DG]

Another avenue that I've experimented with and have had
encouraging results with its using the Expanded Spectrum
Systems Time Machine Board as the I/Q source to feed the Flex
Radio PowerSDR program. Works quite well. You do need to be
cognizant of the actual frequency vs. displayed frequency
though. The TM board also has a pair of mixers to take I/Q
base band (~audio) inputs and make a TX signal out of it (I
haven't yet tried this). The TM board is only $135 kit and
$170 assembled. See:

http://www.expandedspectrumsystems.com/

However you do need to come up with a LO source for the ESS
TM board, although you can supply it with an xtal as well. To
use an external LO source ESS has a LO1 daughter card ($35)
for the TM board that you feed a 4X frequency to, so for
28MHz transverter IF work you feed it a 112 MHz signal @0-5
dBm. ESS also has band pass filter boards for all the HF
bands ($17/each).

I've also use the TM board to feed signals to I2PHD's SDRadio
program as well. It is an RX only program that works quite
well too. See: http://www.weaksignals.com/

All in all lots of fun stuff to play with out there in the
land of SDR if you look for it.

Duane
N9DG

--- "Chris Cox, N0UK" <chrisc at BritishCarAndDriver.Com> wrote:

> 
> For those who caught Terry, W0VB, and Mike, KM0T, SDR
> presentation at 
> either Au'05 or CS05, you might be interested in the
> following just to 
> whet your appetite.
> 
> http://www.n9vv.com/SoftRock-40.html
> 
> This is a page that uses the very same SDR console code as
> the SDR-1000, 
> however, it is a tiny (2" square) PCB that plugs into a USB
> port for 
> power.  It provides a basic IQ 40 metre receiver which is
> tunable +/- 
> 24kHz from the crystal's nominal frequency.
> 
> Looks like a fun project to play with prior to investing
> heavily in a SDR.
> 
> -- 
> 73  Chris Cox, N0UK  email: chrisc at chris.org or
> Alice at BritishCarAndDriver.Com
> 
>  Home Page: http://WWW.BritishCarAndDriver.Com  
> http://www.pingjockey.net 
> 
>   Come and join us here in the Twin Cities, July 2006, for
> the 40th annual
>   Central States VHF Society Conference, hosted once again
> by the NLRS.



	
		
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