[DSP-10] sequencing and control question

[Courtney Duncan]

I'm using the DSP-10 to drive a 1296RSU followed by a DEMi 2330PAK  
amplifier and have successfully made a few contacts on an 8 element  
medium gain beam.  The setup is not in its final configuration  
though.  I have to throw three switches to go from transmit to  
receive.  The three things are Amp/preamp switch, antenna switch, and  
DSP-10 T/R.  Clearly, for the "final" configuration, I want all this  
switching to be automatic with PTT.

One way I was thinking of doing it would be to add outputs for control  
and signal switching to the 1296RSU box itself.  All the voltages I  
need are already in there. This has the advantage that it puts all the  
switching close to the item being switched and I could ultimately  
remote all the 23 cm stuff nearer to the antenna.  It has the  
disadvantage that all those control wires coming out of the box would  
be pretty good antennas at 1296 and the 1152 LO.  Of course I could  
fix that with standard use of µF bypass capacitors.  It also has the  
disadvantage that it makes it harder to be doing all this switch  
controlling from the DSP-10 itself.  It is a nice feature of the  
DSP-10 that it can be a sequencer, but, I'd need software to make the  
DSP-10 do it and I'm not yet to the point of modifying my own DSP-10  
software.

Anyone here have any thoughts on this, examples of what you've done,  
or other advice?

Courtney, n5bf/6


"It's science. They don't know anything; they just make a lot of  
educated guesses."  -- Viannah Duncan

Courtney Duncan, n5bf/6
cbduncan at earthlink dot net
1296.100, 1.810.
n5bf at amsat dot org