The new W5HN beacon keyer - NTMS
The new W5HN beacon keyer - NTMS
The new W5HN beacon keyer - NTMS
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<strong>W5HN</strong>NorthTexas<strong>NTMS</strong>MicrowaveSociety<strong>The</strong> <strong>new</strong> <strong>W5HN</strong> <strong>beacon</strong> <strong>keyer</strong>Dave Robinson WW2R
<strong>W5HN</strong><strong>The</strong> old <strong>keyer</strong>NorthTexas<strong>NTMS</strong>MicrowaveSocietyKeyer Currently used on the 902/1296MHz<strong>beacon</strong>Transmits callsign , location and telemetryinformationTelemetry: 902 Power output, 1296 Poweroutput, Beacon supply volts, Chassistemperature. (Only 4 channels).Uses 16C711 one time programmable PIC
<strong>W5HN</strong>New <strong>keyer</strong> requirementsNorthTexas<strong>NTMS</strong>MicrowaveSocietyNew <strong>beacon</strong> package would have 4 bands soWes, WA5TKU suggested it would be nice tohave more Telemetry channels4 RF outputs4 <strong>beacon</strong> temperaturesPower supply currentPower supply volts
<strong>W5HN</strong>Which PIC?It had to be another PIC! After a lot ofresearch the 16F886 was chosen due tothe following features:-NorthTexas<strong>NTMS</strong>MicrowaveSociety•10-bit 11 channel A/D Converter•Internal Oscillator selectable 32kHz thro 8MHz•In-Circuit Debug (ICD) via two pins•25 I/O pins 28 pin package•Flash program memory•$3
<strong>W5HN</strong>ProgrammerNeeded <strong>new</strong> one which could debug and programNorthTexas<strong>NTMS</strong>MicrowaveSocietyDiscovered through G4DDK the Microchip PICKIT 2in circuit programmer / in circuit debugger, on offerfrom Microchipdirect for $39.99
<strong>W5HN</strong>Current SensorNorthTexas<strong>NTMS</strong>MicrowaveSocietyUse Allegro micro hall effect sensor as used inW1GHZ current meterUsing ALCS713ELCTR-30A sensor0.5V = 0A 4.5V = 30ASOIC 8 Package!Also available in 50,75 and 100A versions (biggerpackage)
<strong>W5HN</strong>Temperature SensorUse LM34DZ sensor againProduces 10mV/degree F (e.g. 100F=1V)Needs 5V supplyPower meter InputsNorthTexas<strong>NTMS</strong>MicrowaveSociety4 inputs through 10 turn potentiometer to set level5.1V zener on each input to protect PIC from excessvoltage
<strong>W5HN</strong>CircuitNorthTexas<strong>NTMS</strong>MicrowaveSociety
<strong>W5HN</strong>ConnectionsJ1 setup in software as current sensor.NorthTexas<strong>NTMS</strong>MicrowaveSocietyJ2 monitors the 12V supply voltage of the <strong>beacon</strong>J3,4,5,6 setup in software for LM34DZ temp sensorsJ7,8,9,10 power output monitorsJ11 is earthed so <strong>beacon</strong> will just send telemetryAll telemetry 3 digits, 255 maximum value.
<strong>W5HN</strong><strong>W5HN</strong> KEYER PCBNorthTexas<strong>NTMS</strong>MicrowaveSocietyTTL level outputs drive the <strong>beacon</strong> modules directly
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