[Elecraft] OT QRP: Low Power QPSK experiment Advice sought

[Don Wilhelm]

Neil,

If you are going to operate digital modes, you have a perfectly good way 
to generate the digital stream.
It is the computer soundcard and the application that you will be using.
The computer soundcard is good for generating anything in the audio 
range.  There are several software applications that will produce 
several types of audio waveforms.  A web search will reveal several of them.
But for your purposes, I would think that the software application that 
you intend to use to generate the digital signal would be the best thing 
to use.

73,
Don W3FPR

On 3/27/2014 7:41 PM, Niel Skousen wrote:
> Good Evening All,
>
> This is low power, just not strictly QRP operating.  I'm looking for input and advice ** off the list **
>
> I'd like to do some experiments with QPSK and GMSK at 450 - 900 MHz, and looking for advice on howto inexpensively do so since I dont have  digital modulation signal generator.   I'd like to look at some modulation sideband effects at +/- 5x the modulation frequency.    Ideally I'm looking at 5Mbps QPSK, but lower bandwidths (~1Mbps) might work for me as similar answers to my question ( interference suppression ).
>
> I have an HP 8921 for Spectrum analysis and a decent scope, but no good way to generate and decode the digital stream.
>
> Any thoughts for on-the-cheap approach would be appreciated (eval kits etc)
>
>