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

[Mel Farrer]

While off topic, hi.  Look into the old TV signal simulator generator for the old Satellite band.  They had some good test sets for modulating a 30 MHz FM bandwidth.  It would be a good place to start.  They operated in the 3.7 to 4.2 GHz band, but the test set had the modulation format at 70 MHz.  Spread spectrum would be the next area to look.  That was all wideband digital.  A lot of 900 MHz SS stuff is available with a little effort.  A thought.

Mel, K6KBE





On Thursday, March 27, 2014 4:57 PM, Niel Skousen <nskousen at talisman-intl.com> 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)

Thanks for the Bandwidth

Niel
WA7SSA
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