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F5OEO-WsprryPi
kopia lustrzana https://github.com/F5OEO/WsprryPi
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pe1nnz 2013-03-28 20:26:40 +00:00
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14
README
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@ -19,12 +19,12 @@ Credits:
To use:
In order to transmit legally, a HAM Radio License is REQUIRED for running
this experiment. The output is a square wave so a low pass filter is REQUIRED.
Connect a low-pass filter to GPIO4 (GPCLK0) and Ground pins on your
Raspberry Pi, connect an antenna to the LPF. The GPIO4 and GND pins can be
found on header P1 pin 7 and 9 respectively, the pin closest to P1 label is
pin 1 and its 3rd and 4th neighbour is pin 7 and 9 respectively, see this
link for pin layout: http://elinux.org/RPi_Low-level_peripherals
Examples of low-pass filters can be found here: http://www.gqrp.com/harmonic_filters.pdf
Connect a low-pass filter with decoupling C to GPIO4 (GPCLK0) and Ground pins
on your Raspberry Pi, connect an antenna to the LPF. The GPIO4 and GND pins
can be found on header P1 pin 7 and 9 respectively, the pin closest to P1 label
is pin 1 and its 3rd and 4th neighbour is pin 7 and 9 respectively, see this
link for pin layout: http://elinux.org/RPi_Low-level_peripherals Examples of
low-pass filters can be found here: http://www.gqrp.com/harmonic_filters.pdf
The expected power output is 10mW (+10dBm) in a 50 Ohm load. This looks
neglible, but when connected to a simple dipole antenna this may result in
reception reports ranging up to several thousands of kilometers.
@ -43,7 +43,7 @@ To use:
Frequency calibration is REQUIRED to ensure that the WSPR transmission occurs
within the 200 Hz narrow band. The reference crystal on your RPi might have
an frequency error (which in addition is temperature dependent).
an frequency error (which in addition is temperature dependent -1.3Hz/degC@10MHz).
To calibrate, the frequency might be manually corrected on the command line
or by changing the F_XTAL value in the code. A practical way to calibrate
is to tune the transmitter on the same frequency of a medium wave AM broadcast

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