Antenna Switch Box. Update, Feb 2012
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- Elaine Gibbs
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1 Antenna Switch Box Update, Feb 2012
2 Antenna Switch Box What is it a reminder
3 Basic station Contest Station Radio Amplifier PC Antenna Switching
4 Add SO2R Contest Station Radio BPF Amplifier PC SO2R Box Antenna Switching Radio BPF Amplifier
5 More antennas Contest Station Radio BPF Amplifier PC SO2R Box Antenna Switching Radio BPF Amplifier
6 Lots of controls Contest Station Radio BPF Amplifier PC SO2R Box Antenna Switching Radio BPF Amplifier
7 Band Decoders Band Decoder Contest Station Radio BPF Amplifier PC SO2R Box Antenna Switching Radio BPF Amplifier Band Decoder
8 Relay controller Contest Station Radio BPF Amplifier PC SO2R Box MOAS Antenna Switching Radio BPF Amplifier
9 Designed for station control Contest Station Radio BPF Amplifier PC SO2R Box MOAS Antenna Switching Radio BPF Amplifier
10 Radio inhibits Contest Station Radio BPF Amplifier PC SO2R Box MOAS Antenna Switching Radio BPF Amplifier
11 Status Hardware design completed Case design starting Documentation in progress Firmware completed and tested Prototype testing completed External relay board on hold Software development needed
12 Block Diagram USB to Serial Microprocessor Relay latches USB FT-232RL ATMega328P TPIC6A596 or MIC5891 Relays Inhibit latch TPIC6A596 Amp T/R TPIC6A596 or MIC5891 Relays Inhibits More Latches
13 Prototype 1 LEDs on relay and inhibit outputs Pushbuttons for T/R inputs USB powered Inhibit LEDs Activity LEDs T/R buttons Microprocessor Firmware Reload Square wave input Test and timing LEDs Relay drivers Relay LEDs
14 Prototype 2 Full PC board implementation Bruce, WW1M did the layout Source Drivers Sink Drivers Amplifier T/R Inhibit
15 Prototype 2 Full PC board implementation
16 Box Design Jose, N4BAA has volunteered He designed the SO2R Box
17 Documentation I m working on a programmer s document Assembly manual not started yet
18 Testing Performance Stress Hardware Function
19 Performance - Latency Latency T/R change to relays change Requirement less than 1 ms Goal less than 500 μs
20 Performance - Latency Measured with oscilloscope 80 μs Code examination showed worst case 10 extra μs Interrupts off Timer interrupt 11 μs Resolver 57 μs worst case Others less than 5 μs Worst case latency < 180 μs
21 Performance - Resolver Conflict resolver algorithm 2 n Interrupts are on commands and T/R changes cause restart Goal ¼ second worst case Measured 40 ms with eleven conflicts. Ten conflicts caused barely perceptible delay
22 Stress Connected square wave generator to T/R pin My square wave generator is lousy not quite 50% duty cycle Stable to over 5000 Hz Tested with continuous antenna commands and 1000 Hz
23 Prototype 2 Testing
24 Hardware Function
25 Hardware Function Source Source Source Source Source Source Source Source Source Source Source Source Source Source Source Source Source Source Source Source Sink Sink Source Source Source Source Source Source Sink Sink Sink Source Source Source Source Source Source Sink Sink Sink Sink Source Source Source Source Sink Sink Sink Sink Sink Sink Sink Sink All tested cases worked correctly T/R and inhibits also tested
26 Relay Board
27 Software Test program written Not good enough for general use
28 Software Dick, WC1M is integrating it into his station control software I m looking for people to work on a simple application I m not a GUI developer
29 Software I d like to work on a client-server version Non-PC clients too Touch-screen devices It would be seriously cool to control the antenna system from an ipad
30 Estimated Cost Sixteen output kit Board and box All parts You supply solder and a USB cable You select source or sink outputs $150 Additional eight outputs $15
31 Summer 2012 Estimated Delivery
32 The End I m Outta Here See you on the bands Work Me Spot Me And thanks for your support
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