kopia lustrzana https://github.com/F5OEO/WsprryPi
temp coeff
rodzic
25e4d89841
commit
0ad919e902
14
README
14
README
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@ -19,12 +19,12 @@ Credits:
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To use:
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To use:
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In order to transmit legally, a HAM Radio License is REQUIRED for running
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In order to transmit legally, a HAM Radio License is REQUIRED for running
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this experiment. The output is a square wave so a low pass filter is REQUIRED.
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this experiment. The output is a square wave so a low pass filter is REQUIRED.
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Connect a low-pass filter to GPIO4 (GPCLK0) and Ground pins on your
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Connect a low-pass filter with decoupling C to GPIO4 (GPCLK0) and Ground pins
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Raspberry Pi, connect an antenna to the LPF. The GPIO4 and GND pins can be
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on your Raspberry Pi, connect an antenna to the LPF. The GPIO4 and GND pins
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found on header P1 pin 7 and 9 respectively, the pin closest to P1 label is
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can be found on header P1 pin 7 and 9 respectively, the pin closest to P1 label
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pin 1 and its 3rd and 4th neighbour is pin 7 and 9 respectively, see this
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is pin 1 and its 3rd and 4th neighbour is pin 7 and 9 respectively, see this
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link for pin layout: http://elinux.org/RPi_Low-level_peripherals
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link for pin layout: http://elinux.org/RPi_Low-level_peripherals Examples of
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Examples of low-pass filters can be found here: http://www.gqrp.com/harmonic_filters.pdf
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low-pass filters can be found here: http://www.gqrp.com/harmonic_filters.pdf
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The expected power output is 10mW (+10dBm) in a 50 Ohm load. This looks
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The expected power output is 10mW (+10dBm) in a 50 Ohm load. This looks
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neglible, but when connected to a simple dipole antenna this may result in
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neglible, but when connected to a simple dipole antenna this may result in
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reception reports ranging up to several thousands of kilometers.
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reception reports ranging up to several thousands of kilometers.
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@ -43,7 +43,7 @@ To use:
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Frequency calibration is REQUIRED to ensure that the WSPR transmission occurs
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Frequency calibration is REQUIRED to ensure that the WSPR transmission occurs
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within the 200 Hz narrow band. The reference crystal on your RPi might have
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within the 200 Hz narrow band. The reference crystal on your RPi might have
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an frequency error (which in addition is temperature dependent).
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an frequency error (which in addition is temperature dependent -1.3Hz/degC@10MHz).
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To calibrate, the frequency might be manually corrected on the command line
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To calibrate, the frequency might be manually corrected on the command line
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or by changing the F_XTAL value in the code. A practical way to calibrate
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or by changing the F_XTAL value in the code. A practical way to calibrate
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is to tune the transmitter on the same frequency of a medium wave AM broadcast
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is to tune the transmitter on the same frequency of a medium wave AM broadcast
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14
wspr.c
14
wspr.c
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@ -35,12 +35,12 @@ Credits:
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To use:
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To use:
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In order to transmit legally, a HAM Radio License is REQUIRED for running
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In order to transmit legally, a HAM Radio License is REQUIRED for running
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this experiment. The output is a square wave so a low pass filter is REQUIRED.
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this experiment. The output is a square wave so a low pass filter is REQUIRED.
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Connect a low-pass filter to GPIO4 (GPCLK0) and Ground pins on your
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Connect a low-pass filter with decoupling C to GPIO4 (GPCLK0) and Ground pins
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Raspberry Pi, connect an antenna to the LPF. The GPIO4 and GND pins can be
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on your Raspberry Pi, connect an antenna to the LPF. The GPIO4 and GND pins
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found on header P1 pin 7 and 9 respectively, the pin closest to P1 label is
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can be found on header P1 pin 7 and 9 respectively, the pin closest to P1 label
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pin 1 and its 3rd and 4th neighbour is pin 7 and 9 respectively, see this
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is pin 1 and its 3rd and 4th neighbour is pin 7 and 9 respectively, see this
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link for pin layout: http://elinux.org/RPi_Low-level_peripherals
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link for pin layout: http://elinux.org/RPi_Low-level_peripherals Examples of
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Examples of low-pass filters can be found here: http://www.gqrp.com/harmonic_filters.pdf
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low-pass filters can be found here: http://www.gqrp.com/harmonic_filters.pdf
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The expected power output is 10mW (+10dBm) in a 50 Ohm load. This looks
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The expected power output is 10mW (+10dBm) in a 50 Ohm load. This looks
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neglible, but when connected to a simple dipole antenna this may result in
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neglible, but when connected to a simple dipole antenna this may result in
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reception reports ranging up to several thousands of kilometers.
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reception reports ranging up to several thousands of kilometers.
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@ -59,7 +59,7 @@ To use:
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Frequency calibration is REQUIRED to ensure that the WSPR transmission occurs
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Frequency calibration is REQUIRED to ensure that the WSPR transmission occurs
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within the 200 Hz narrow band. The reference crystal on your RPi might have
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within the 200 Hz narrow band. The reference crystal on your RPi might have
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an frequency error (which in addition is temperature dependent).
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an frequency error (which in addition is temperature dependent -1.3Hz/degC@10MHz).
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To calibrate, the frequency might be manually corrected on the command line
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To calibrate, the frequency might be manually corrected on the command line
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or by changing the F_XTAL value in the code. A practical way to calibrate
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or by changing the F_XTAL value in the code. A practical way to calibrate
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is to tune the transmitter on the same frequency of a medium wave AM broadcast
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is to tune the transmitter on the same frequency of a medium wave AM broadcast
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