Here is a Detailed Set of Block Diagrams for the Proposed SST Radio for the TAPR SS STA/
Next Generation FCC, Part 97 - SS Rules
By Randy Roberts, KC6YJY
Top Level SST Block Diagram
OK all you "SS fans" out there -- here are my very latest thoughts on a modular,
low cost SS radio design for Ham Radio. The block diagram above shows the top level,
sort of interconnection view of the new design that I have in mind. After following
the TAPR SS SIG for several months and watching our email from all of you, I have
incorporated a few changes to the previous Ham Radio SS schemes.
This design can use either the STEL / ZILOG DSSS baseband chips OR the Harris PRISM
baseband chip (HSP3824). Note from the following block diagrams that almost all of the
other chips in the Harris PRISM Chipset are used in this design.
The design is modular and flexible enough to allow "a mix and match" of PCBs to allow
Frequency Hop Modulations to be used, as well!
Finally, my favorite SS Modulation -- namely "Hybrid" combined DS / FH is easily
accommodated in this design, since the Harris Dual PLL synthesizer IC (the HFA3524)
can switch up to 50 MHz (at 2.4 GHz) in under 400 microseconds!
Please realize that NOTHING in this design, so far, is "locked in concrete!" In
other words, we are very open to suggested improvements, simplifications, etc.
This design is intended to overcome some of the criticisms of our previous "ideas"
for a Ham Radio SS design. This design is NO LONGER "band specific" -- even though
we have shown a concept here for the 2.4 GHz band. Other IF or RF PCBs can be designed
and accommodated for many other frequency bands. Also, the scheme presented here allows
both DS AND FH modulation formats to be transmitted AND received without worrying about
"Band Specific" transverters and their non-linearities, group delay distortions and
similar "little" details.
This is just the very first, small introduction to this design -- I plan to add a lot
more design description details and related ideas, as time permits!
Please take a look at the concepts presented here -- I'd love to hear from you with
constructive criticisms and I'd very much like to hear your ideas! Just drop us an email:
[Editor's note: Randy's email is no longer active] or post something on
the TAPR SS SIG: ss@tapr.org -- 73 for now!
"Basic" SST Baseband (BB) Block Diagram
Harris "Prism" Option SST Baseband (BB) Block Diagram
Frequency Hop MX-COM Option SST Baseband (BB) Block Diagram
Frequency Hop TI DSP Option SST Baseband (BB) Block Diagram
SST IF Block Diagram
SST Frequency Hop Option IF Block Diagram
SST LO Block Diagram
SST RF Block Diagram
Download ALL ORCAD Capture .DSN Block Diagram Files (Zipped ~19K)
Download ALL ORCAD Capture Files [ in .DXF Format ]
Block Diagram Files (Zipped ~26K)
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